science-help

[fair hearth]

Hii does anyone know how to do question 23, there’s no values for distance given to me so I’m kinda confused how I can get the magnitude of it

[willow sequoia]

The upward force will be Kx and downward will be mg

And to calculate the magnitude of it u need the mass of the person and distance at which she stopped

[sharp berry]

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[bitter bloom]

does someone here have an idea how to answer this?

[willow sequoia]

Yes but they haven’t given u either of m or x

[sharp berry]

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[willow sequoia]

And methoxy phenol has +M

Which is less acidic

Its the least acidic

[sharp berry]

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[willow sequoia]

If resonance is there then + m is theres so both r almost the same thing

Either way the answer is the same

[sharp berry]

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[thorny gyro]

can someone please explain cross-aldol condensation between ethanal and propanal?

[willow sequoia]

U want the mechanism is it?

[sharp berry]

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[thorny gyro]

thanks that helped a lot!

[thorny gyro]

thanks for the info!
however if I consider butanol has +I which reduces acidity
and para methoxy phenol has +M or +R effect which reduces acidity too! but +R is stronger that +I so para methoxy phenol's acidity will be much more lowered than that of butanol...in that sense butanol should be more acidic than para methoxy phenol. Can you clarify where this reason goes wrong?

[sharp berry]

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[thorny gyro]

okay

[willow sequoia]

Resonance decreases acidity tho

Or am I getting confused

[sharp berry]

One message removed from a suspended account.

[thorny gyro]

<@&942391219206647828>

[leaden plover]

@merry raven

[merry raven]

thanks

[lament vapor]

76. A person on a raft is drifting downstream with the
    current. Suddenly he dives off the raft and swims
    upstream for a quarter of an hour. He then swims
    downstream at the same velocity with respect to the
    water and catches back up to the raft at a position
    1.0 km downstream from where he started. What
    is the speed of the current, in kilometres per hour?
    (1.6 or 2km/h)

Can someone help me with this question please, i don't understand how you would pull any numbers from limited amounts of information

[lament vapor]

I’m assuming there will be three distances that you can calculate

[prisma totem]

hii anyone here studying astrophysics?

[quartz comet]

as a minor yeah

[worldly finch]

can someone give some tips on understanding physics content (specifically the bPho year 12 challenge) except for doing ppq. Because realistically the same question wont come up and tbh so far I havent even found anything weven similar

[quartz comet]

walking outside

[worldly finch]

😐

[lyric dove]

he is being serious lmfao

like you aren't gonna circumvent a complex issue by endlessly searching google

walking outside is analagous to spending time in a muse

[worldly finch]

yh but i dont think it will help me too much

if i could understand physicsd by walking outside i would be a genius with straight A*s

[quartz comet]

i studied and walked outside with the mindset of "what did i see in class that i can explain to myself right now"

i aced it

you can to

physics is the study of what happens around us

you wont see any of it if you stay inside and study study study, thats overrated

[stoic ivy]

help

[west yew]

6

[stoic ivy]

THANKS BRO

[ebon canopy]

does this pic mean that retinoblastoma spread to his brain?

does this pic mean that retinoblastoma spread to his brain?

(CT scan)

[thorny gyro]

I guess the medic help is the best channel for this

[copper python]

hNT REAL

[warped hound]

I was wondering if you'd be interested in taking two short surveys. One is over fashion and sustainability; the other one is over art and perception. Your participation would help greatly! And all submissions are anonymous.

[west sun]

Why, if the vapourisation (condensation) temperature of water is 100°C, is there still water in the air? Why is it all non-condensed

[noble marsh]

Wdym ? 100° is the evapourasiation temperature, water is in gas phase at atmospheric pressure

[fringe compass]

<@&942391219206647828> pls do sth about about this ma'am u can't keep spamming here like this

[clever scarab]

<@&942391219206647828>

[leaden plover]

@white sleet they're at it again

[lofty stone]

does anyone have good notes for counter current mechanism/concentration of urine?

[worldly finch]

can anyone explain why neutrinos can only be detected if above the threshold energy

[snow meadow]

is this special relativity

[worldly finch]

im not sure, Im just researching neutrinos and I saw that they can only be detected if its above a threshold energy, but I was confused as why that is

[snow meadow]

interesting

im not sure how to help you with that one, sorry, ive studied very little on alpha and beta decay

idek inverse beta

[worldly finch]

its alr thanks anyways bro

[frosty wave]

help

when doing thevinin

do you consider the dependent source

as vth + the voltage across 12 ohm

[lilac narwhal]

could someone explain where 4.25 is coming from for the pKa?

[sharp berry]

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[lilac narwhal]

Ohh ok thank you! I thought I was going crazy lol

[polar moss]

The energy value is very less in terms of MeV. They react very feebly with nuclei, that too is a very rare occurrence. But they simply cannot interact with energies below the threshold. Could be that they lack charge(so electrons will remain unaffected because of the small mass). So only way they can interact with a nucleus is maybe when they have a minimum energy value (having sufficient mass to interact). I'll not go into spin contribution here. Won't make much difference. But that's what I think it is. Below threshold energy, the mass would be way too low for interaction. Just an opinion, nothing more.

[worldly finch]

ok thanks so much

i understand it more now cheers

[glass bear]

does anyone know how to do this?

its for nodal analysis

[snow meadow]

yeah

[lyric dove]

anyone get this (part b)? My professor words his problems in an odd way

[snow meadow]

youre doing it right

did u put R and x in parantheses and square it?

thats like the most important part and u got it

instead of plugging in the values, just solve the equation without variables

[lyric dove]

for part b?

[snow meadow]

yea

u should solve a quadratic

[lyric dove]

yea im just having issues with rearranging the equation algebraically

[snow meadow]

oh ok ill help

[lyric dove]

This is what my professor did

[snow meadow]

yeah

[lyric dove]

but my calculation yields a different answer lol

[snow meadow]

can I DM u

I can’t send message cuz file too big

[lyric dove]

oh wait nvm I was dividing instead of subtracting zzz

[worldly finch]

Can someone draw a Hess cycle and show where the numbers are on the Hess cycle be

Because ugglinf to know where to put the numbers on the cycle

[frosty wave]

surprised they dont allow u to use mesh current analysis 😭

wouldve made it easier

you can prol combine the resistors and do source transformation to make things easier

[snow meadow]

thats what i thought of doing

[pulsar hull]

Can someone help me understand how this is the right answer, idk how they got 2.07, I tried -log(0.16) it wasn't right

[worldly finch]

thank u so much

[green remnant]

this is a reach but if anyone can point me in the right direction on how to do this i would appreciate it

[broken plaza]

Np!!

[mighty cosmos]

pH of a solution = the negative base 10 logarithm of the concentration of hydrogen ions [h+] in the solution

and in the case of 0.160 M HNO2 solution, the concentration of h+ ions is 160 mM right?

by taking the negative base 10 logarithm of h+ gives us: pH = -log[h+] = -log(160 mM), which gives 2.07

there might be a mistake in your method, try again

[celest crane]

help

why is y the place with the least Spring potential energy ?

[mighty cosmos]

because it has a flat topography and lacks terrain features that could create springs (such as hills n mountains)

this type of landscape reduces the amount of runoff which prevents the formation of springs

and i think at the equator, the energy is at its lowest point bc the force of gravity is at its minimum

[split thunder]

At point Y, the spring is neither extended nor compressed (i.e it is in a neutral position).

PE = 1/2kx^2. As x increases in either direction (extension or compression), potential energy increases. So, this neutral point Y provides the lowest PE out of the 3 options

(i think)

[exotic lynx]

because the potential by gravitational pull and elastic potentional have the least difference at point Y and hence cancel outs eachother

(Look I'm a 10th grader... and that's all I can figure out from the figure so please correct me if i'm wrong 🥲 )

[ember sluice]

Is this correct?

[ruby sequoia]

When I wrote “holds true ONLY for strong acids”, I meant that substituting the concentration of the acid directly (without using Ka) only works for strong acids.

[broken plaza]

OFF TOPIC BUT I LOVE YOUR PFP ONG

[lyric dove]

Can anyone solve this problem and see if they calculated similar values? I received partial feedback earlier but am still stumped:
A 1000 kg car starting at rest reaches a velocity of 45 m/s in a distance of 25 m up a frictionless incline of 35 degrees. What is the work done by the engine on the car? (d) What is the average force and power exerted by the engine of the car?

[ember sluice]

Tnx

[split thunder]

ngl i haven't done mechanics in ages so you might want a second opinion

also could not think of a way to comfortably do the power

[split thunder]

@quartz comet help

[fickle solstice]

Off topic but your car kinda looks like amogus.

[lyric dove]

yea I figured out the first part using trig

solving for power sux. @snow meadow any idea?

I did (distance * work)/time. I calculated time using kinematics, which this part is that which is under question

[snow meadow]

hm lemme see

[snow meadow]

i did i

[quartz comet]

I always do work with energy theorema

Best thing there is

[snow meadow]

idk if i got it right

[snow meadow]

oh i’m dumb

it’s plus instead of minus

why did I do that

[ember sluice]

Can someone find a mistake? I can’t

[wide vigil]

hope this helps @ember sluice :)) 🩷

[split thunder]

aye I tried using that approach

but i'm a bit shit w these types of questions

[split thunder]

yeah that makes sense

[fathom oriole]

physics centripetal forces, if anyone know how to solve would appreciate (how do I even draw the FBD lol)

[quartz comet]

there could also be an outward force called the centrigal force

depends if you have to neglect or not

[thorny gyro]

Hi, please can anyone answer this within two days? I am having my exam and this is from a specimen paper.
In case you are wondering about the background.
It is a question from class 12th biology of ISC board (India)
And the question is from the chapter biotechnology and the topic is Gel electrophoresis and vectors

Please while replying ping me or send me a dm!
With love from India ❤️

[thorny gyro]

Hope it helps.
DM for any queries

[ember sluice]

Ooh i flipped the fraction oopsie

[ember sluice]

Thanks

[wide vigil]

no problem cutie🩷

[tawdry imp]

anyone know what happens to the ketone?

like how do we get rid of the carbonyl

[tawdry imp]

https://tenor.com/view/guts-sad-berserk-waiting-raining-gif-11623609

[foggy star]

someone help this dude already😂 😭

[cunning crescent]

What is it that you're asking?

Do you want to see the electron movements?

[tawdry imp]

More like how the ketone splits to become branched but I sort of get it now

Ty tho

[chrome island]

Can anyone pls explain me calorimeter? And when to use its formulas?

[chrome island]

You will use Bf3 as a reagent and idk it’s mechanism either but you can use this as a trick to learn

My trick is, where you can see the hope of making H2O make it and it works most of the time

H20 will be made, which is a good leaving group

It’s a guess, sorry if the logic is incorrect in advance

[chrome island]

Is this how you did? Pls share your answer too, thanks

[thorny gyro]

Please help me with this one-
Calculate the cell potential, E°cell, when H₂O₂ is oxidized by MnO4. The half-reactions are-
2H++O2 + 2e = H2O2 ; E° = + 0.68 V
MnO4+8H++5e¯ = Mn2+ + 4H2O; E° =1.51 V

[chrome island]

I have 2 answers and idk which one is correct, Ecell = 6.4V or -0.4 😭

I forgot electrochemistry, but as per I know, this will be solved by 🔺G= -nfEcell

Ecell won’t be added directly as it is an intensive property

n will be 10 when you try to equate the electrons

F will get cancelled

[thorny gyro]

Same....i am out of practice as well and this question has to come🥲

[thorny gyro]

+/-0.83,+0.38 or +2.19...i think one of those is the correct answer

[chrome island]

Can you send your solution?

Because you have to reverse the anode reaction

And E cell will become negative

If reaction is happening it means net E will never be negative so I g the answer is 6.4

This is my solution

[frozen linden]

U12=MCv(t2-t1), can anyone explain, if this is for constant pressure, volume or for temperature?

[thorny gyro]

It was a multiple choice question... Those 4 were the options given

[chrome island]

I see

Sorry dude then idk what is the answer

But I will try once again

[thorny gyro]

No problem... Ig i shd start to review tht chapter agn...i hate tht

[thorny gyro]

Good luck and Thanks buddy

[chrome island]

Physical chemistry sucks man

Organic is better

[thorny gyro]

Idk...i dont like chemistry 🥲

[chrome island]

Good luck dude, it will be fun

Hopefully.

[thorny gyro]

Yeah😆

[chrome island]

I feel you dude

Do you think there is any mistake in my sol.?

[thorny gyro]

Feeling is mutual then😞

[chrome island]

🤝

[thorny gyro]

Can u solve this using nernst

[chrome island]

AHHHHHHHHHHHHH

wait wait

We do not have the concentration

[thorny gyro]

Yeah

[chrome island]

I don’t think this will be solved by nerst eqn

We do not have E cell

[thorny gyro]

I forgot

[chrome island]

And conc

It should be solved by G= -nfEcell

See, my answer was 0.4

So maybe the answer is 0.38

Maybe

[thorny gyro]

Yeah....maybe

[chrome island]

Here just minus 3.4 and 3

I added here because I took 3 positive

Hopefully it is correct, if not then pls do send me the solution

[thorny gyro]

Inshaallah... Thnx agn🌸

[chrome island]

Can anyone explain difference between electron affinity, ionisation enthalpy in a little detail?

[split thunder]

it's constant volume!

you use Cv for constant volume and Cp at constant pressures

[split thunder]

constant temperature won't apply as you only ever use the mc(t2-t1) equations when temperature changes

the other equation being ∆Q = mCp(T2 - T1), where ∆Q is change in heat energy and Cp is specific heat capacity at constant pressure

[frozen linden]

Yeah right, It was used for concluding that for a constant temperature heat Supplied = work done , so i am kind of confused as to why is that relevant

I don't understand that statement at all, it says change in internal energy fo isothermal process then shows a formula where there is change in temperature

[safe sphinx]

anyone can help me identify strcture

from spec

hydrocarbons are the bane of my exsistance

my discord on my laptop is taking 10 years too update

So IR

NMR

Carbon 13

Mass Spec

Mass is already there

and Imma assuming it's 5 carbons and 10 hydrogens
5 x 12 = 60 + 10 = 70

So #1 and #2 satisfies the rule of triplet and quartet

I know that is for sure correct

#3 is my guess on the 5th extra carbon on the C13

#4 is the middle Singlet with 3H

and #5 breaks the rule

It needs to have more than 4

but rn idk how to get there

[stuck oak]

I just studied this, but can anyone help me with Klechkowski of Chromium (Cr) 😢ASAP

Someone plss

[chrome island]

It’s the n+l rule right?

Electrons will enter the sub shell which has low energy ig

Cr is a special case

[stuck oak]

TYSMMM

[chrome island]

🫂.

[split thunder]

this looks interesting.

can you send a picture of equation 4.9 and I'll have a look at this once I'm back from the gym?

[cinder mason]

its doesn't show 'change' in temperature it shows that between state 1 and 2 there is no change in temperature due to which there is no change in internal energy in isothermal process
and as per the first law
Energy of system = Heat suppied - work done
0 = Q - W
Q =W
hence all heat will be converted into work

[chrome island]

Can anyone explain difference between electron affinity, ionisation enthalpy in a little detail?

[split thunder]

oh yeah. it does show ∆U = 0.

soooo like wiz was said

[frozen linden]

Ah makes sense , thanks

[thorn zodiac]

In intel 8051, why setting any port to 0 makes it an output port and making it 1 acts as an input?

[lyric dove]

WHERE'S THE PHYSICS MAN WHEN I NEED HIM @quartz comet

[quartz comet]

Loads of other people are a lot better then me hahahaa

But what's up? What can I help you with

[frozen linden]

Any tips for thermo numericals?

[lyric dove]

all jokes my guy! I was just faced with an energy problem i have never seen before lol

[quartz comet]

Lemme help you thrn

[lyric dove]

A 950 kg car starting at rest reaches a velocity of 50 m/s in 120 m. If the coefficient of friction on the tires and ground is 0.35, what is the work done by the engine and friction on the car? (b) What is the average force of the engine on the car?

[lyric dove]

I never worked with friction and work simultaneously

[quartz comet]

There is an EQ for that

Since you are working with external forces

So your total energy is the the sum of difference in kinetic and potential

So T1 + U1 = T2 + U2

But external forces results in the following:
T1 + U1 = T2 +U2 + F_ext

Try working with that shoukd be good I thinj

You can also use kinematic equations

[split thunder]

with thermo, I found being strong with fundamentals helped a ton in the long run. there is a lot of stuff that repeats (subtly and not so subtly) through all the levels so having a strong foundation really helps.

so rather than remembering formulas, I usually try to understand where the formula comes from, and I can write it down from there. Really you want to break things down into the lowest level (at your discretion) and be strong with all of these little pieces.

(i hope that is kinda what you were asking)

[sour bear]

Does someone know how to solve this problem, we need to make this for a group project but aren't sure how: A 5 mL plasma sample (pH 7.4) from the patient treated with tramadol hydrochloride was extracted with 10 mL ether (true partition coefficient (P) ether:water = 75). The ether was evaporated dry and the extracted drug reconstituted in 2 mL of chloroform. The concentration of tramadol in chloroform is 10.8 μg/mL. Calculate the initial concentration of tramadol in the plasma sample.

[formal pasture]

hi everyone i have a school project its about building a science project if the project good enough my project will be taken to the international space station DM if u want to help

[sturdy notch]

Hi, do someone knows why this is the solution to the differential equation.

I believe we can write it with complex numbers but idk

also theta(0)= theta'(0)=0

[quartz comet]

est ce que cest lagrange?

ou pas?

[sturdy notch]

euh je pense pas je sais pas ce que c'est

[quartz comet]

tu veux fair un photo de question general?

tu dois fair ca?:

En déduire l’équation vibrationnelle normale pour un système conservateur avec des liaisons holonomes indépendantes (décrit par un lagrangien avec n généralisé
coordonnées), pour de petits écarts autour d’un équilibre stable.

Peut-être que cela peut vous aider ?

[sturdy notch]

woww ca me semble beaucoup plus compliqué que mon niveau, mais ça marche peut être

[quartz comet]

C'est science naturelles première année

[placid lodge]

how does 1st has more resonance structures than the 2nd?

[deep plank]

arent they each others resonance? idk much though

[placid lodge]

i thought so too but in the ans it says that 1st has more structures than 2nd and therefore 1 is more stable than 2

[deep plank]

i think stability is about formal charges

either way all of the elements have formal charge of 0 nah?

[placid lodge]

thats the thing

its a question of hyperconjugation vs resonance

[deep plank]

wait i actually drew this wrong

in resonance the elements do not change their places but i gave hydrogens to other carbons lol

but that way carbon makes 5 bonds which is impossible

[deep plank]

first time hearing about hyperconjugation so idts i can help w this one

[placid lodge]

oh npp!!

[placid lodge]

haha

i didnt notice these texts earlier, im sorry

[deep plank]

np 🤣

[thorny gyro]

<@&942391219206647828>
This guy is in every channel

[split thunder]

10J laddie

[thorny gyro]

Hey everyone, I have a physics question, it's about the spring. Could anyone explain it to me, I don't get why it's correct: if 2 boys were pulling each end of a spring with the same force exerted on the spring from the boys, why would the elongation of the spring be the same if the spring was attached to a wall and a boy was pulling the spring towards him with the same force (as the other boys)?

[past linden]

this is about hooke's law i'm pretty sure

[past linden]

'the elongation or compression of a spring is directly identically proportional to the force applied to it'

the forces exerted are equal and same in both situations where he's pulling it from the wall and where he's pulling it with his friend

so even when the two boys are pulling, the friend cancels out as he exerts the same force

the net force is the same

[thorny gyro]

I will be honest, I still don't really get it, the friend force cancels out the other guys force?

[past linden]

I think yeah since they both exert the same amount of force it's basically like it doesn't matter if the friend on the other side was pulling or not

idk my wording is a bit weird but

[thorny gyro]

but if they cancel out, then there wouldnt be an elongation?

[past linden]

they don't exactly cancel out I guess moreso they're equal

[pastel sluice]

one friend ends up becoming the wall. i feel like u could understand it in reverse. if u and a friend tried to walk into each other u arent going to go anywhere. same if u walked into a wall. that could either be a helpful explanation or completely useless. i have no clue what the theory is so im just assuming that how it would work (im no a smart man)

[past linden]

this is how I understood if i'm not mistaken

when forces are exerted from both sides, the spring elongates or compresses around its equilibrium position -> the equlibrium position is the midpoint in the two boys case

@thorny gyro does that make sense or

[thorny gyro]

It makes a lot of sense, but isn't the elongation supposed to be 18m and 18m for the first example and the second? isn't the second scenario not supposed to be 36 m? or am I the one understanding it wrong?

[past linden]

no no ur right cause in the two boys case the total elongation of the spring is 36m

but, we measure the elongation from the middle in the second case since there are two (equal) forces pulling from both sides

when we measure from the middle, it's still considered 18m to the boi

[thorny gyro]

oh ok nice, still weird that we measure it from the middle but the other stuff makes sense

thank you so much for explaining it to me

[past linden]

ofc glad i could be of some help

[past linden]

you don't always measure from the middle, only when the two opposing forces are equal

the general rule is you measure from the equilibrium point which you can find with hooke's law (F = kx)

but when the forces opposing are equal just take the midpoint as the reference

[thorny gyro]

ooh, that makes so much more sense

thank you so much again ❤️

[past linden]

ofc ofc ur most welcome

[restive quest]

does someone knows WHERE i can found the meaning of each “term” in this equation? this is all i have but im not sure what “n” stands for, or that inverted triangle

[split thunder]

well, for those 2 terms, the upside down triangle stands for divergence. It really is just a fancy way of representing a differential. The differential operator (divergence) is applied to a 3 dimensional vector function to produce a function that describes a rate of change. It represents the 'outgoingness' of the particle under consideration.

kinda looks like this:

well when considering velocity anyway

uhhh for n, I thibk it's just the number or so of the particle you're considering

but that could be totally wrong

[split thunder]

is there any more context you can give? is this equation being applied in a heat transfer sense, or a fluids sense, or so on?

ahhhh it's geology.
so n will be the concentration of the substance per gram of carrier

[restive quest]

i was seeing atmosphere, im not sure about the context of it but it says is about “chemical transport”

[restive quest]

thank u so much 🙏🏼

[autumn sky]

how do i find out the excited orbit of electon ?

[fickle solstice]

I guess you gotta assume maximum spectral lines here, i.e., ground state to n=infinite.

Ow wait, wavelength is given. You can find the excited state

λ = Rz² (1/n² - 1)

[empty fable]

Why is this wrong I’m so confused can someone please help me

[split thunder]

night mode notability enjoyer

well, it's likely because you're assuming all of the energy from the bullet is converted to gravitational potential in the block

in reality, that probably won't be the case

i think you would want to consider some rotational equations to help you find where the energy has gone

i don't remember any of them i'll go look now though

ok honeslty you're probably right and i have no idea what I'm talking about

[split thunder]

what if you considered momentum?

[empty fable]

Nvm it’s fine I just didn’t add the masses correctly I think

Cheers tho

[split thunder]

good looks

[split thunder]

I'm super curious about the solution though, how'd you do it?

[empty fable]

I’ll write it out and send it

It might not be as high level physics because I’m doing AS physics at,

ATM

[split thunder]

cheers

OH ITS EMBEDDED

that is one wacky question

fair enough

[split thunder]

gl w exams

[empty fable]

Yeah it’s difficult to see

[empty fable]

Thanks man, I’m so ass at physics so it’s a struggle

[split thunder]

nahhhhhh you're already reading questions well, that's about half the battle

maybe a quarter

[empty fable]

lol thanks

Gl with whatever exams u r doing as well lol

[thorny gyro]

Not sure but maybe as the branching increase, boiling point of alkaline chain decreases.

[unborn crown]

could anyone here who has studied organic chemistry (uni level) give me some tips for studying this subject?

[ebon canopy]

A Type II error involves:

                (A) concluding a difference between groups exists after the experimental manipulation when, in fact, a difference does not exist
                (B) concluding a difference between groups does not exist after the experimental manipulation when, in fact, a difference does exist

(C) concluding a score is two standard deviations above the mean when, in fact, it is two standard deviations below the mean
(D) concluding a score is two standard deviations below the mean when, in fact, it is two standard deviations above the mean
(E) rejecting the null hypothesis when, in fact, it should have been accepted
----how is it B?
C and D and E are ruled out but not sure about A and B

[fathom ravine]

Can someone tell me how the addition of 2 moles of HBr to CH2CHCOOCH2CHCH2 takes place?

[exotic lynx]

Not at all sure about the solution but as a newbie to organic chemistry I wanted to try it... try to provide the error and the solution if I'm wrong

[hallow glen]

hello guys

do u know a good chanel in youtube for last year student in highschool (physics)

[autumn sky]

Br will attach to the secondary carbon becasue it has a more stable carbocation aka markonikov rule, futhermore, the left carbocation is resonance stabilized

it can be better understood as

[exotic lynx]

Thankss Bro, appreciate it...😇

[thorny gyro]

I can try but I can't understand the second one too

[thorny gyro]

Okay iam in 12th too and I am female if u want, I can add u and we can try and solve this together

To find the standard potential of the corresponding galvanic cell (ii), you can use the relationship between Gibbs free energy change (ΔG°) and standard cell potential (E°):

[ΔG° = -nFE°]

Where:

• (ΔG°) is the standard Gibbs free energy change (given as -62.5 kJ/mol).
• (n) is the number of moles of electrons transferred in the balanced equation.
• (F) is Faraday's constant (96485 C/mol).
• (E°) is the standard cell potential we want to find.

To find (n), examine the balanced equation. The number of moles of electrons transferred is determined by the stoichiometric coefficients of the species involved in the redox reaction.

Given the balanced equation:
[2 Ag^+ + CrO_4^{2-} + 2 e^- → Ag_2CrO_4(s)]

The number of moles of electrons transferred ((n)) is 2.

Now, rearrange the equation to solve for (E°):
[E° = -\frac{ΔG°}{nF}]

Substitute the given values into the equation and solve for (E°).

For part (ii), the standard potential of the Ag2CrO4/Ag,CrO4^2- couple can be calculated using the Nernst equation:

[E = E° - \frac{RT}{nF} \ln Q]

Where:

• (E) is the cell potential under non-standard conditions.
• (E°) is the standard cell potential (which you calculated in part (i)).
• (R) is the gas constant (8.314 J/(mol·K)).
• (T) is the temperature in Kelvin.
• (n) is the number of moles of electrons transferred.
• (F) is Faraday's constant.
• (Q) is the reaction quotient.

You would need to calculate (Q) using the concentrations of the relevant species in the cell.

I have added you

[thorny gyro]

can someone explain why we have to write a in terms of F to solve this?

[split thunder]

Well, F is what the question is asking for. The acceleration is also one of the 'knowns' (in the sense that it is known a is equal in both the block and object).

Since you know this, it becomes easier to approach the question with F and a in mind

If you are asking about the last line, it's because you know a is the same for both the block and object. Due to this, you can find F faster by substituting into the equation

[cunning crescent]

I think you cant balance it because you don't have the full equation - where does the H and Na go?

[restive quest]

does anyone have knowledge about classification of waters using their dominant ions (geochemistry), piper diagram? i have a doubt 😔

[outer jetty]

I have a question about entropy , if for example we have gas as react and gas as product (same amount ) the variation is positive or negative

for me its negative cuz the system becoming more stable but idk

[dim elk]

positive change in entropy as the first reactant molecules turn into product.

as they are in same phase

[outer jetty]

ye but why

can u explain to me the cause

[cinder mason]

stable as in more stable compound?

entropy doesn't depend on how stable the compound is

since same number of gas molecule is being formed
two possible cases arises
either the number of micro state remains same (so s=0)
or there is increase in micro state (if complex molecule broken into simpler ones,) which causes increase in entropy

think entropy in terms of number of possible arrangement of molecules or atoms

[outer jetty]

order and disorder more disorder = less stable thats what I meant it wasnt clear sorry

So for this one : CO (g) + 1/2 O2 (g)=> CO2(g)

as the molecule is bigger its positive ?

And this one : Cl2(g) + H2 (l) = Hcl(aq) + HclO (aq ) its + cuz there is more particles ? or is it because we changing state

[cinder mason]

yes entropy decreases here
so negative reason being even though there are same number of molecules
the co2 is has less freedom to move because of rigid structure of molecules as compared to reactants

hence lesser number of possible arrangement

[cinder mason]

due to it being in liquid form there is decreases the possible number state (as in liquid there is less room to move around)

@split thunder back me up

[outer jetty]

It was my first tought then I ask to chat gpt and it said the opposite

The shit is pure evil

[outer jetty]

Ty mate

[cinder mason]

never fully rely on chatgpt
that sht gets gaslight very easily

[split thunder]

me when chemistry:

[cinder mason]

"theory will only take you so far"

[split thunder]

yea @outer jetty gotta make some chlorine gas

[cinder mason]

sniff*

good shit

[split thunder]

jokes aside I'm dogshit w chem oops

[split thunder]

bro is really gonna be wiz "was"

[cinder mason]

man entropy same everywhere haiyaaaaa

shame on newton

[split thunder]

very haiyaaa moment

[split thunder]

dude smoked too much crack

[outer jetty]

https://tenor.com/view/breaking-bad-chemistry-experiment-scientific-walter-white-gif-17820266

[thorny gyro]

so true, im currently studying chemistry and it say SO many things wrong 😭

[dim elk]

https://tenor.com/view/harry-kane-shhh-footballer-gif-17936295

[quick steppe]

Anyone able to answer a quick question?:

Say the concentration of an enzyme is 0.005 mg/ml and the reaction rate is 0.0054, what is the unit for the reaction rate measured in seconds? Is it mg/ml/s?

[cinder mason]

moles/l/s

[dire shuttle]

depends on the order of rxn

or wait you said measured in sec?

shouldnt be the unit be in sec^-1

[quick steppe]

Why would it be?

[quick steppe]

You sure it's moles/l/s and not mmoles/ml/s? Just so if I do edit it, I don't get it wrong

[cinder mason]

yee

reaction rate is also depletion rate
moles/liter is standard unit to get concentration

source: trust me bro

[dire shuttle]

oh no my bad i literally thought you were asking about the rate constant mb bro
yeah its mol lit^-1 sec^-1

i mean ml;

ml

it should be obvious tho

[quick steppe]

So just molar?

[quick steppe]

Wdym?

[thorny gyro]

This was a question and this was the solution

Now my doubt:

Suppose we take 1000gm water and 500gm ethylene glycol.
Let it's freezing point be -100 degrees.
Now if we are cooling it to only -50 degrees then some mass of ice will form and rest part will be water .
The ice formed will be due to the fact that that mass obtained it's freezing point.
Now my point is when we are cooling it to -50 degrees, if we assume it to be the freezing point depression,and apply the formulas ,then the molality we are getting is the molality of that mass of ice freezed.
So shouldn't x be th mass of ice formed?

Please ping me when replying...dms are preferred kinda

[quick steppe]

dude love the handwriting

[dire shuttle]

it should be obvious if the given info is in ml you should convert it to standard units or let it be like that according to the options

[thorny gyro]

Afaik Normal reaction from A should be zero when wheel turns and gets up

[quick steppe]

It was obviously not obvious since I asked.

[cinder mason]

xD

[dire shuttle]

Mate you have some issues if that was not obvious ☠️

[quick steppe]

What are you even saying, your subjective opinion holds no significance. Perhaps stay silent?

[autumn sky]

any insights?

[dire shuttle]

Why are you so mad?

[quick steppe]

Why are you assuming I am mad? I simply dislike your comment because you literally said one has issues if you don't understand enzyme kinetics, however considering your profile picture and your childish language, I am not surprised.

[dire shuttle]

You should be considering studying kinetics maybe that will help you more than my profile picture

[quick steppe]

Uff, what a comeback! Perhaps you should learn basic grammar and punctuation.

Anyways, you are not worth anyone's time, bye. 😊

[thorny gyro]

Guys.

Dont argue on a SCIENCE CHANNEL HAHAHAH

Lets live in peace

[split thunder]

ok this is one cooked question

so I've tried thinking about it in terms of units, then by the step by step process of water freezing

[split thunder]

got about that far but no Idea what role specific heat capacity plays

not sure, but the terms can definitely work further to get a nice expression

[supple monolith]

Can someone help me draw the Lewis dot diagram for these

CO2, CHCl3, K2O

[thorny gyro]

https://youtu.be/dD0Xl4acUFg?si=zNgYS6D3qefbn3yV

[thorny gyro]

https://youtu.be/1ZlnzyHahvo?si=982ZbcOMcti32M5c

[thorny gyro]

Hope it helps

[thorny gyro]

I cant remember anything from highschool tbh , but i remember this was as any chemistry lesson , so as i remember any highschool subject is there on yt

[supple monolith]

Ok thank you

[supple monolith]

So what would it be for k2o

@thorny gyro

[timber yoke]

To create the Lewis dot diagram for potassium oxide (K2O), we first need to determine the number of valence electrons for each element:

• Potassium (K) is in Group 1 of the periodic table, so it has 1 valence electron.
• Oxygen (O) is in Group 16, so it has 6 valence electrons.

1. Start by placing the least electronegative element (potassium) in the center. Oxygen will surround it.

   K O K

2. Distribute the valence electrons around each atom, pairing them up if necessary. Remember, each bond contributes two electrons.

   K O K
   : : :
   :
   : : :

3. Complete the octet for each atom by forming bonds between potassium and oxygen atoms. Each potassium atom donates one electron to form a bond, and each oxygen atom shares two electrons to form a bond.

   K O K
   : : :
   : : :
   : : :
   : : :
   K ─ O ─ K

4. Count the total number of valence electrons used in the diagram. Each bond contributes two electrons, and each lone pair contributes two electrons.

   K O K
   : : :
   : : :
   : : :
   : : :
   K ─ O ─ K

The Lewis dot diagram for potassium oxide (K2O) shows two potassium atoms bonded to one oxygen atom through ionic bonds. Each potassium atom donates one electron to the oxygen atom, resulting in a stable arrangement for both atoms.
@supple monolith

[supple monolith]

So would it be this

@timber yoke

[thorny gyro]

https://youtu.be/SUxHClEAF9A?si=3YqjBsAhSiLB5nUB

[thorny gyro]

Yw

[supple monolith]

Isn’t this the same thing I drew

Or do I gotta add the charges

[thorny gyro]

Ig u have to
He explained it in the video tho , but idk if it was necessary or he was just showing as the steps

[supple monolith]

Oh ok

Thank you though!

[timber yoke]

oops

[supple monolith]

?

[thorny gyro]

Yw!

[thorny gyro]

hi can anybody tell me why cant n-ethyl-n-methylethamine be written as n,n-diethylmethamine?

[sharp berry]

One message removed from a suspended account.

[cinder mason]

Damn

[autumn sky]

isnt the longest carbon chain the parent one?

[thorny gyro]

oh💀

[outer beacon]

How to prove Fermat’s principle( least time) in optics using laws of reflection and laws of refraction?

I can do the opposite but this one is giving me some trouble

[quartz comet]

i have it writtin out

lemma show you

excuse me for my handwritting

work with triangles

v = x/t

differentiate

also, you know that its a principle that has been around for a pretty long time so think in classical ways

triangles, circles etc

aint no way there is some crazy advanced mathematics etc

i also think i have a small sign convention mistake, but the essence is there

[copper python]

6th question can anybody pls help

I keep doing mistakes in calculation what should I do

[unreal chasm]

hell yeah

anti diffeentiation part 2

[split thunder]

drawing is a bit sketchy! d is the height of the triangle

[worn smelt]

does anyone know why date can be a primary key when it isnt unique?

answer is b

[split thunder]

answer is b? so it's not that the date is unique, it's that since the lists are created weekly, you will only have one list of a certain type created on a specific day.

the two of these combined are unique.

think of it like your friends. you may have 2 friends born on the same day, but you will only have one friend from the Jones' household born on that day. Hence, you can use uhhhh date and family name as the primary key for your friends.

[copper python]

Thanks @split thunder

[somber bison]

I have a scientific question about the 'final fate' of the universe. According to what I read about boltzmann's understanding of entropy, the second law is statistical. However, this idea was controversial because it implied there was a very small probability for entropy to decrease, rather than the previous understanding that entropy could only increase. It seems boltzmann was proven correct experimentally, when challenged on it by Planck and others. Given infinite time, is it not certain that all entropy has to reverse if there is any non-zero probability for it to occur? When people talk about the final fate of the universe, given an infinite amount of time I don't know why we would stop considering things after some finite amount of time. That would be less than the first planck second of an eternal universe.

What makes me doubt this is not understanding by what mechanism energy that has been lost in the form of light radiation could ever return, or energy lost through various other types of radiation that propagate through space? Perhaps the universe's final state is matter radiating itself out of existence over infinite time?

[split thunder]

question

in the experiments, under what conditions was entropy able to decrease

[somber bison]

The experiment didn't show entropy reversed. Just that boltzmann's statistical calculation of entropy, that gave a probability of entropy reversing as real but extremely unlikely, produced a more accurate result confirmed by experiment than the methods at the time which didn't allow for the possibility of entropy doing anything but increasing.

This is from memory, but I'll double check my source.

[worn smelt]

ahh that makes sense thank you so much

[split thunder]

oo makes sense, i mean the possibility of the universe's entropy (over an infinite amount of time) going down is definitely a cool thing to consider.

it is stastical, as you've mentioned. In a system, there is definitely the possibility for the reduction of entropy at certain points over time. For the universe, i don't think we would see this at a considerable scale.

if heat death ends up not being the fate of our universe, there could be some currently unheard of ways by which energy starts becoming available again (like in your last paragraph). Answer from me is, I have 0 idea. But, the heat death theory is my favoured one for now.

[somber bison]

I have the quotes here from the book Ernst Zermelo : An Approach to his Life and Work by Heinz-Dieter Ebbinghaus

I'm guessing the improved radiation formula was tested experimentally, but it didn't say anything about an experiment technically

[somber bison]

It would definitely take an inestimable amount of time and be supremely unlikely, occurring well after the heat 'death' of the universe. But given infinite time, even the most unlikely things have to happen.

I'm just not sure if it's very unlikely or if it truly has no chance to occur because of some scientific information I'm not aware of.

[next cedar]

BOTANY: Hello does anyone know the parts here and what is happening in these pictures?

[exotic lynx]

I've got the first part but second part is troubling me... please try to provide a brief solution for a beginner 🥲

[split thunder]

I'd guess not, cus ΣFy = 0, so it's more likely that 2G + T3 = T1y + T2y

[sharp berry]

One message removed from a suspended account.

One message removed from a suspended account.

[copper python]

Please answer q3

[copper python]

Just want to clear out the answer : since c =distance / time. And we know that time is reduced to half but speed of light i.e "c" is constant so to make it constant the distance is needed to be increased hence the universe is doubled over night. Is this the answer ?

[exotic lynx]

Not really... Actually I was studying by PW where the teacher gave this one out of many PYQ's

He said this one is of Jee Adv.

[exotic lynx]

That's HC Verma..?!!
I too have it, and I remember reading and thinking about that question

[exotic lynx]

Thanks a lot... appreciate it🫡

[exotic lynx]

Ig we can conclude it by calculating the gravitational force btw Moon and Earth... since the size is doubled (assuming the densities to be same) the gravitational force would be quadrupled , as,
g = (GMm)/R^2
g' = (G2M*2m)/R^2

But there's an issue that if the size is doubled either the empty vacuum btw earth and moon should also get doubled or the distance btw their closest points would come even closer

[sharp berry]

One message removed from a suspended account.

[worldly finch]

what epq topic would you recommend me do as a person who does maths, chemistry and physics and i want to pursue engineering (preferably mechanical engineering). Initially I wanted to link my epq to some advanced mechanics mathmatics (since i dont do further maths) but im finding a topic for that quite tricky.

since i think i have to pose my dissertation as a question

[split thunder]

https://tenor.com/view/bro-gif-24276502

[split thunder]

I mean there's so much you could do

[worldly finch]

i have a prompt anyways so its fine lol

[split thunder]

oh

[worldly finch]

what was ur idea if u had one tho>?

[split thunder]

lmaooo I was gonna ask your hobbies

Could always do sth hobby related so it's even more fun for you

[worldly finch]

ah fairss

[split thunder]

or any interests, blah blah blah. One of my mates who was an F1 enjoyer did sth relating to tires for his BEng final year. Another liked robots so he made a lil scanny bot. Lot of potential in stuff like that so it may be worth thinking about

[worldly finch]

ah ok thanks bro

making something is quite interesting

[split thunder]

ye you don't even have to make anything, can just do an investigation. In my case I made a software model for a renewable energy thing. Could be an analysis of golf swings even

[worldly finch]

damn thats impressive

[split thunder]

never said it worked

https://tenor.com/view/3d-saul-saul-goodman-adamghik-gif-23876766

[worldly finch]

oh...

still impressive as u probs did research

[exotic lynx]

My elder brother also says tha same😇 ... I'll definitely practice maximum possible jee mains pyqs

[sharp berry]

One message removed from a suspended account.

[granite lichen]

hello everyone, do you have a material about peroxosimal and glycerol exidation and as well as endogenous and exogenous pathway? like a video material or even just a document form?? thankyou

[proven quartz]

Hiii! can anyone pls help me with these questions?? Thank youu T^T

[upper pebble]

hope this helps!! ignore the writing 😅 @proven quartz

[upper pebble]

replying to this.

[proven quartz]

THANK YOUUU!!! I HAVE A TEST TMRW N YOU SAVED ME A MENTAL BREAKDOWNNN : " D n I hope your pillows are cold both side, thanks againnn

[exotic lynx]

Yeahh... luckily for me, I would get all the module, notes and other stuff of FIIT-JEE of my brother in a month asa he would be done with adv. .

[sharp berry]

One message removed from a suspended account.

[loud mirage]

Any method to solve the circuit
electrical (count all currents and
durable)

guys plz help me i cant do it can someone solve this

[upper pebble]

i dont get it what do u need to find?

[loud mirage]

count all electric current and electric voltage

[upper pebble]

ok

[cinder mason]

To find current
Use mesh law

[copper python]

Guys my sir made us write this I didn't understand where this delta cam from since d/dx (ln x) is 1/x

This is from error analysis

[outer jetty]

Its for small changes since ln(1) = 0

[copper python]

So after 1st ln(x) they took it again as ln(1) ? Cuz I cannot understand working

[lavish obsidian]

Usually we consider error in f(x) to be derivative of f(x) multiplied by ∆x

I think it comes from Taylor series I don't remember exactly

Also this is only when ∆x<<x which is the case for most situations as we assume it beforehand

[copper python]

that means we assume x as a very small integer such as 1 and write del x

[weak prawn]

For a rigid body, let say a cube sliding on an inclined plane. When we make the free body diagram of the cube, we know that the normal reaction force vector changes its point of application according to the situation , we also know that friction = coefficient of friction × normal force .
So Can we determine a point where we can call/assume it the point of application of friction?

[lavish obsidian]

Uhh del x is the absolute error!!

And ∆x/x is relative error

Did your teacher not tell the basic definitions and stuff before going into errors in log etc.

[copper python]

he did tell us abt log but didnt told us abt the "errors in log"

[hushed sail]

Merge R1 and R2 into one, then do ohms law for everything I guess

U can also search for Kirchoff's law it could help

U can also convert all of the remaining resistances into one sole resistance

It would be easier to solve

[outer jetty]

It has to do with absolute and relative variation but idk if your teacher already told you about that if he did not just keep this in mind , you will need it for incertitude calculus with * and / (using the proprety of log) and for + and - you'll use differentials

[lavish obsidian]

Ah man that sucks see if you can find Khan academy video or smth on it it might help you clear your basics

[copper python]

ok

thanks you both

[random prawn]

Just a quick bio question:By the end of Kreb cycle, how many ATP, NADH, FADH2 and CO2 are made?

Start with 1 glucose

[distant moss]

glycolysis : net 2 ATP 2 NADH, PDH: 2 acetyl CoA 2 NADH TCA: 6NADH 2 FADH2 2 GTP (i forget co2)

[exotic lynx]

The results of Mains April Exam just came yesterday, He scored ig 95%ile

[mighty yoke]

can anyone explain why hydroxide is solube in this instance

<@&942391219206647828>

[terse vapor]

ty ty

[autumn sky]

if all capacitors are identical each of capacitance C find the equivalent conductance between A and B

any insights?

[thorny gyro]

search up star delta capacitor conversion

[exotic lynx]

Given answer is 2m/s.

[quartz comet]

Does anyone has a full pdf of the solutions of classical mechanics by goldstein 3rd edition? cant seem to find full editions on google

[meager mantle]

hey ! can anyone help me to understand chemistry first chapter of class 11th, can anyone find me a good yt video

im new just new to the science world

nah, the laws of chemical combinations

like the gay lussacs law and the avogardo's law and all

I know the laws but can't understand how to do the numerical's

numerical's of multiple proportion

yoo @night coral help me out ?

damn thanks

and also for the time graph of physics of motion in a straigt line ?

thnks arigatoo

[exotic lynx]

I guess it should be 40 cm length and 20 cm height. As for the minimum velocity we have to make the ball reach the edge of the last step and hence fall on the floor. The line of trajectory should be going tangent to the edge of the last step.

[floral tide]

hey, does anyone know youtube channels i can use to study electric circuits?

[quartz comet]

organic chem tutor

[floral tide]

i like his videos but i would rather another channel if you have one

[lavish obsidian]

Hey can I dm u about smth

[slate slate]

hello guyz

hello

it asks abt no of atoms so shouldnt it be 6.74576x10^24 ??

ask me for any explanation ..

[lyric dove]

yes, this is exactly what I got!

[lavish obsidian]

Yeah that solution is wrong

[quartz comet]

wassup

[crystal hare]

Hey, I'm not sure whether this is the right place for programming questions but: I need to implement the secant method to approximate the root of a function. One of the given functions is f(x)=tanh(x) with initial values x1=-1 and x2=3. This leads to the output NaN because of the asymptotes of tanh. I asked the tutor for help and he told me that if I make the method return an error message for f(x1)*f(x2)>0, all cases with asymptotes should be solved. As you may guess, that didn't work. I asked chat gtp, which implemented an if statement leading to the root becoming infinity. I am at my wits end and could use some help. Here is my code:

double secant(double x1, double x2, double (*func)(double), int &schritt, const double tol )
{
double xn; // Variable für die lineare Approximation
schritt = 0; // Schrittzähler für Konvergenzgeschwindigkeit
//triviale Lösung
if ( func(x1) == 0 ||func(x2)==0)
{
std::cout<<"0";
}
//checken ob f(x1)*f(x1)>0 => return 0
if (func(x1)*func(x2)>0)
{
std::cout<<"Bedingung nicht erfüllt\n";
}
do
{
// Berechne neuen Wert für die lineare Approximation
xn = x2 - func(x2) * (x2 - x1) / (func(x2) - func(x1));

    x1 = x2; // für die nächste Iteration: x2 -> x1
    x2 = xn; // xn -> x2
    schritt++; // Inkrementiere
} while (std::fabs(x2 - x1) > tol); // Iteration wiederhohlen bis gewünschte Genauigkeit erreicht wird

return xn; // Ergebnis

}

Here is the code from chat gpt:

double secant(double x1, double x2, double (*func)(double), int &schritt, const double tol)
{
double xn; // Variable for the linear approximation
schritt = 0; // Step counter for convergence speed

do
{
    // Calculate the new value for the linear approximation
    xn = x2 - func(x2) * (x2 - x1) / (func(x2) - func(x1));

    // Check for NaN or extremely large values
    if (std::isnan(xn) || std::fabs(xn) > 1e10)
    {
        // Adjust interval away from asymptotes
        double mit = 0.5 * (x1 + x2);
        if (func(mit) * func(x1) < 0)
            x2 = mit;
        else
            x1 = mit;
    }
    else
    {
        x1 = x2; // Update for the next iteration: x2 -> x1
        x2 = xn; // Update for the next iteration: xn -> x2
    }

    schritt++; // Increment step counter
} while (std::fabs(x2 - x1) > tol); // Repeat iteration until desired accuracy is achieved

return xn; // Result

}

[icy tendon]

chemistry,
is there a specific naming convention that helps us figure out the compound of hydrogen peroxide?

e.g: ''per'' adds one more oxygen than the ''ate'' form for some anions

[karmic galleon]

Help

@

[topaz hedge]

Hey, everybody.
So there's this project I need to finish for tomorrow. My biology teacher said to do everything from 0, hence I've been sitting the past few hours on my laptop. My topic is "How to live in accordance to our biorythms". I wanted to find information on if people back then lived more according to their biological rhythms and what hinders us today on living a healthy life, but I couldn't find anything. Is there anybody who could help me?

[quartz comet]

Food
Social media
Time changing periods

You can write a whole lot only on that

[scarlet mountain]

similar question

[cunning crescent]

does anyone have any good resources on how to determine what can be used as an internal standard when a stable isotope of your specific compound is not available for whatever reason?

[karmic galleon]

Thanks a lot

[cyan frigate]

in these two questions we need to find the net flux but the apporach of both the questions are different and the final result isn't matching if done the other way

When to know to substitute the value of x in variable E.F and when to go by integration?

[hollow roost]

Someone recommend me a way to complete backlogs 😭😭

[frigid night]

HELP

I keep getting 1.8x10^4

no matter what when i try to calculate the gravitational potential energy i always get it to be x10^9 instead of x10^8

is my calculator just awful or is this the same for anyone else?

[next cedar]

Hello does anyone know why my uncertainties are super wrong

[keen tangle]

Can anyone please help me how to find theF ?

This is biologie ( genetics)

[pale plinth]

What class is this

[next cedar]

Analytical chemistry

But i got the solution

Ty anyway

[thorny gyro]

I need an urgent physics help

This is the question I was given.
Those on right are capacitor plates. And the one which is rolling is cylinder.(Tell me what u can't understand and I will tell u about it)

This was how I solved it.

I used basic Newton's laws of motion

This was my sir's answer.
He considered the whole system and wrote equations so that no. Of equations decreases.

We are asked to find the acceleration, and surprisingly my ans and sir's ans are diff as u can see.
Can you tell me where is the mistake and who is doing the mistake...I am clueless

Concepts used: capacitors, Newton's laws of motion, rotation of bodies

I will be really grateful if you could solve this before 25th may...I am in urgent need of it...

[dreamy spade]

I can help u

but this topic need long conversation

from the first look I don't see here where do you use dielectric coefficient of the brick

also your expression for moment of inertia is incorrect (no it's my mistake)

[raw blade]

Yes yes.. I haven't noted down the expression of F so dielectric constant will be used in the expression of F..

The thing is, since m and m' are not undergoing rotation here, why do we have to include their moment of inertia in the equation? That's actually my main concern..

[dreamy spade]

if you reduce the length of ropes to near the zero, we can effectively say that they are rotating around the cilinder's axis

[raw blade]

Thank you.. but is there any specific name of this concept? I mean, the fact that we have to reduce the rope's length to check effective rotation?

[dreamy spade]

I don't know if this concept has any name, but you can make yourself sure that rope's length doesn't affect rotation equations, because it will not also affect strict 3 Newton laws if you will try to write them for every point of cilinder

[raw blade]

I see.. thank you so much..

[thorny gyro]

Can you help us with the fbd and explain it to us, in that way it will be easy for both of us

[dreamy spade]

It's a bit wide topic without specific problem you want to solve, I definitely can explain that but it will transform into lecture instead of post

[thorny gyro]

No no I meant, just the fbd of the system. We know the concepts, we are just new to the concept that we need to include m and m' in the equation for moment of inertia.

If you could solve the equation using basic Newton's laws of motion like I did , it will be very helpful

[dreamy spade]

I can explain you that in a call, I'm too lazy to write it all here

[thorny gyro]

Alright let me see if @raw blade is up for it. Actually it was his problem.
Thank you for the initiatives!

[dreamy spade]

I guess the mistake is that you equalized accelerations of both bricks, while brick m will have twice as much acceleration as brick m' has

because they are connected via movable block

yeah it seems like it's the main mistake in the solution

you wouldn't meet that problem if you solved that in your teachers way via total moment of inertia

[thorny gyro]

I thought of using constraint relation with the help of power developed by internal force is zero (T.v=0) and then relate the accelerations but got stuck after a while

[dreamy spade]

if you consider work of different forces and equalize it to zero you'll automatically obtain moment of forces equation, so you don't need to think about work here

accelerations relation can only be obtained with kinematic relations, as I already said. You just look at geometry of cilinder and get that a=2a' if the bottom of the cilinder is axis of rotation

[thorny gyro]

Can you do it somewhere and send a picture of it here?

[dreamy spade]

yeah wait a second

[dreamy spade]

you can see it from similarity of trianlges

[raw blade]

thankk youu so muchhh yes i got it!!!

[thorny gyro]

That was so so so basic that I ignored it!
My mind is soo complex! 😭

[dreamy spade]

it happens with all of us

[pure flower]

Hello! Is there anyone who has gromacs installed and could help me w md

[dreamy spade]

wdym by nuclear density

rate of nuclear mass over nuclear volume? Or atomic volume?

[meager mantle]

can anyone suggest me a very easy to understand stoichiometry equations yt video

I'm little new to chemistry

[quartz comet]

organic chem tutor

[thorny gyro]

Yes

[placid thorn]

any chemistry ppl here?

[serene heron]

yes me but im in 12th grade-

[lavish obsidian]

Why can't I post any ss here

[ember sluice]

Can someone help me out idk what is halpening here

[dreamy spade]

I don't know palestinian or whatever language it is

[cunning crescent]

Palestinian💀

[kind sonnet]

Palestinian 💀💀💀💀

[lyric dove]

ignorance 🧘‍♂️

[placid thorn]

ok boss

[placid thorn]

i dmd u

[placid thorn]

i dmd u

[surreal canyon]

Chemistry question
Does anyone have mechanism for reaction of 1,5-dicarbonyl and ammonia to form pyridine?

[mystic rose]

In these images, how are the two cells in series?
Current is going to the voltmeter also, wouldn't it make it a parallel connection?

[vernal marsh]

Ideal voltmeter has infinite resistance hence no current passes thru it, it's just used to measure the potential

[mystic rose]

Got it, Thank you so much guys !

[mighty yoke]

Does anyone have any general tips/good recs for understanding how to write redox and acid/base titrations? the part where you have to add hydroxide and water is throwing me off so badly.

[surreal canyon]

Best advice I got is to forget about OH and to use H+.
If we have reaction in basic conditions, try to balance it in acid, then neutralise with OH-. To give an example:
KMnO4 + SO2 + KOH = K2MnO4 + K2SO4 + H2O
Ox: SO2 = SO4(2-)
Now use acid rules to balance:
SO2 + 2 H2O = SO4(2-) + 4 H+ + 2e-
Now add 4 OH- so it can neutralise H+ ions!
SO2 + 2 H2O + 4 OH- = SO4(2-) + 4 H2O + 2e-
Now you just cancel water.
SO2 + 4 OH- = SO4(2-) + 2 H2O + 2e-
Hopefully I helped!

[mighty yoke]

You did! I really appreciate it 🙏

[thorny gyro]

It says a is correct option but I think b should be
As if we use restriction enzyme and cut out the ampicillin resistant gene and in its place I put my desired gene then that colony of vectors won't be resistant to ampicillin and we will be able to identify transformant vectors having recombinant genes.

Can anyone clarify where I am wrong?

[thorny gyro]

No ori is intact...I am assuming I am just replacing the amp site and replace it with my gene of interest so that I know that I have transformant with recombinant

I don't get how in option a I'm supposed to identify if I did transfer gene of interest 😂
Like if I don't transfer it and let it grow in amp medium it will grow smoothly.
If I use (a) and replace the small site with my gene of interest then too it will grow smoothly in amp medium as I am not disturbing the amp resistant site.
However if I use (b) and ligate my gene of interest in place of amp resistant site then my recombinant would have my gene of interest and ori(as amp resistant site is replaced by my gene of interest). Then these won't grow in amp medium and I would know that these colony has been successful!
Also I dare say that this was a single choice correct question so if option b is correct then c will be correct too 😂

[tender hemlock]

anatomy notes please

i dont wanna take this a third time

[calm creek]

Use anki, for anatomy

[lost thunder]

Learn positions, like anterior, posterior, distal, proximal, etc. Trust me in helped me figure out locations which helps with what's wrong

[mystic rose]

Can anyone explain the second part, Like how will the magnetic field point upward in the vertical plane?

[median laurel]

The best way to understand the direction of the magnetic field is to use the right hand thumb rule... thumb in the direction of current... imagine the X-axis as the same as the wire and Y- axis an an imaginary line perpendicular to the wire... now the way your other fingers curl is how the magnetic field will behave... so when you are in the vertical plane(+ve Y axis), your fingers will be pointing upwards...
I hope the explanation helps!

[somber bison]

Suppose you hover some arbitarily small distance outside of a black hole's event horizon, without falling inside. Would you be melted into plasma by blue shifted light from the rest of the universe due to the black hole's time dilation?

[tacit condor]

Yes

The blue shifted radiation creates ionizing energy which if scientifically calculated is enough to melt your whole body into plasma
The ionizing energy and the intense thermal energy will melt you in a fraction of second

And this is all assuming that you're already not experiencing tidal forces and radiation pressure...if they came into play..you would be gone before even god knows

The radiation would have intense energy due to the gravitational blue shift*

@somber bison hope this helps

[somber bison]

It helps a lot! It confirms my intuition of what would happen to an observer approaching a black holes event horizon. Forget whether the black hole is big or small, the accretion disk, or what its like inside of a blackhole, they would be turned into plasma by the blue shifted cmb before ever getting inside.

[somber bison]

Now I'm wondering would the blue shifted light be blasting in-falling matter to within nearly the maximum temperature allowed in the universe the planck second before it passed into the blackhole? And would this blasting change some properties of matter, that would get rid of some information paradoxes?

[tacit condor]

You never know it what if the velocity near it is too high that you are getting sucked in before the blue shift radiation reaches you and in the mean time your accelerating too keeping in mind that the radiation pressure as well as the gravitational shift is acting on you it is more likely you get spaghettified before actually turning into plasma
Or another case might be you turning into plasma while getting spaghettified..since your question was particular yes you would turn into plasma when maintaining a distance
Here distance supports only staying at one point not orbiting coz the centripetal force will be enough for you to not turn into plasma rather stay what you are if the right velocity is achieved

[somber bison]

I'm not as familiar with spaghettification but I think spaghettified plasma would certainly be a possibility. 😅

[quartz comet]

short in short, when you are in it, you wont even notice

and there are some theories whereas you surpase a black hole, you come into a white hole

if you shift long enough to a certain "side" of the black hole resulting in other universes

something like this

which is pretty cool because mathematically it shows that there is an infinite amount of these "boxes"

[tacit condor]

Well I'm not actually certain if I could answer that question for you
We would require a deeper understanding of quantum gravity and space-time and how information is preserved in this universe
The particular scenario you mentioned can happen according to the theory of everything proposed by Stephen Hawking
As we know...everything has a possibility...here or in an alternate universe well it is a compelling idea that the matter would reach nearly the maximum temperature allowed but we need a deeper understanding
Sorry for the inconvenience

[quartz comet]

screams infinite parallel universe????

[tacit condor]

You never know

[somber bison]

I'm a bit confused why the centripetal force would prevent you getting turned into plasma while rotating. Wouldn't rotating at a faster speed just make time dilation more intense (although according to what I've read its approaching infinity at the event horizon already?).

[quartz comet]

nah

[somber bison]

Ya the Penrose diagrams are very interesting. You are reaching the end of time in the previous universe you were in before entering the blackhole (and potentially new universe?). Experiencing an 'infinite time' of cmb radiation all at once seems like it would really fry matter.

[quartz comet]

because the time dialation near the EH is so big that the centripital force does not have a big effect anymore

[tacit condor]

Oh I'm sorry I got a bit perplexed over there I actually meant of escape velocity not the centripetal force...centripetal force is just a mechanical term even if your orbiting at a certain velocity your more likely to turn into plasma..if not by the blue shift but also due to other relativistic effects

Then we come to conclusion

We turn into plasma

No matter what

When visiting a Blackhole

[quartz comet]

identifies as a quark gluon

[tacit condor]

What if we surpass a blackhole and imagine we enter another universe through a white hole...and what if we got into another black hole
Would that send us to over universe...or another universe??

[quartz comet]

That is an extremely interesting question actually

i thought the math checks out, but the physics doesnt

[tacit condor]

Yeaa I'm very much confused about what happens...but turns out we turn into plasma

💀

[quartz comet]

well

its a bit contradicting isnt it

a black is so massive it absorbes everything, even light

so we go in it right?

but a white hole should be its counterpart, meaning you cant get in it

so how could we possibly go from one to another when we cant get into the white hole?

we could also possible imagine that if you pass trough the black hole the other end is a white hole? because the gravity is so strong it just "pushes" you down if you see what i mean

and we havent discussed einstein rosen bridges

mental

[tacit condor]

Brain.exe gave up

[copper python]

Yes but you cant possibilly travel from those

the link between black hole and white hole breaks

becaus the time being infinite to travel btw them

[dire shuttle]

this shi haunts me

[quartz comet]

does somebody know why they sum over 2 different indexes?(the place of the question mark)

its about oscillations

and finding the eigenvalues of an oscillation

this is the rest of the derivation^^

[charred badger]

is there anyone doing masters in physics right now?

[warm hollow]

Can anyone explain how to solve this? I know it's definitely beginner-level astronomy but I'm unsure how mass comes to play when calculating this with Keplers third law. It's probably a lot more simple than my overthinking brain is allowing me to see :')

[trim fern]

What’s au?

[tacit condor]

In this context it's astronomical units

1AU is nearly 150M km

It's approx

T² is proportional to R³

[trim fern]

Oh that’s very huge

[trim fern]

Can anyone tell the solution for 81?

[dreamy spade]

yes

[charred badger]

hi i’m doing my bachelors right now and i needed some guidance regarding where to do my masters from. could you tell me where you’re doing your masters from

[quartz comet]

YO!

what you should do first is look what topic you like the most

Some universities are very specialized in some topics, which gives you an advantage for an eventual PhD.
Ill give an example, my university is excellent in quantum, astronomy, theoretical, condensed matter and nuclear physics.
So if for example I want to do quantum, its an option of staying at my uni. If they dont have the topic you want to specialize in, you should look for a uni that does in fact specialize. Look up the univerities with: Best university for masters in theoretical physics. I support going to the best unvirsitiy possible for you masters because it has a wayyy bigger impact then a bachelors. Most bachelors are very alike, whereas the masters is very very different. Even if it sounds irrealistic to go for example to MIT, it doesnt. Iv heared from people that if your grades are good, and you did research in your bachelors, did well on the GRE then you have a fair shot at getting in. Caltech, oxford, cambridge, all very good schools!
I wish you the best of luck!

I dont know where you are from, but Europe also has VERY VERY good universities, and probably more affordable

[charred badger]

i’m from india and the education system makes it very hard for a general category student to get into good universities here because half of the seats are reserved based on caste system. So i want to get out of here for my masters and need a road map to help me with it, i’m working on my grades right now but really need guidance with the extra things that are needed to build my CV. i have my year break rn (got done with first year exams last week) and i’m looking for the best universities i can aim for, yes MIT and all the ivy league are the top ones but i honestly don’t feel like i can do it.

which university are you doing your masters from right now?

[quartz comet]

Not in masters yet

But talk with people whom are and do phd

So i give you their advice

[charred badger]

ohhh

thanks for the information tho

[restive quest]

can someone explain me how it choose "Region 4" without knowing Ka or pKa? i dont get the ""rules"" for this thing tbh

[solar badger]

theres no friction between the prism and base right

when the mass starts to accelrate downward a itll push the prism backwards i did this in 11th i just remember the concept

calculate the accelration using alpha and newtons third laws equations

ma = mgsinalpha probably

in respect to this calculate the accelration of the prism

[dreamy spade]

it's wrong

ma equals total force and total force consists not only of mg but also reaction force

that's why the bar will fall downwards at bigger angle than alpha

[past plover]

you mean normal right

[dreamy spade]

Normal is kind of reaction force.

Also friction is a reaction force

[past plover]

ohhh

[past plover]

yes

[dreamy spade]

these forces literally are reaction of the surface to body being placed on it

[past plover]

yepp

[trim fern]

I did that but I got the wrong answer

[cunning crescent]

does anyone have any resources on how to determine LOD and LOQ? especially in HPLC?

this stuff is giving me a headache

[prime sandal]

I was thinking about doing AP chem. Is this a bad idea? I like math and science and want a challenge.

[polar vale]

an electron moves along +x direction and mag field along -z direction what will be thwe trajectory of an el;ectron entering from origin

[prime sandal]

idk I haven't taken it but when my teacher taught us for fun I seemed to get it easily

alright

what did you score?

no

but my teacher briefly went over it

I was looking at the AP distribution score and 75% of people passed chem which was one of the highest passing rates of all APs

I was thinking of taking that senior year

I'm going into 11th

2 years before college although i am doing dual enrollment

good question

I should probably look

I have no clue lol

I just want to pole vault in college

haha yea I will think about it. I have about a month

before I finalize my schedule

Ok thank you so much!

What school do u go to?

College?

that's cool

So you do models and stuff

That's awesome

Sounds like it

what are you interested in building?

or designing I should say

oooo

That sounds so interesting

I just know I don't really want to be a lawyer haha

kinda

well for school at least

[proper monolith]

one dimensional motion

I figured i could directly get the displacement since it was an equation of position

but the answer is very incorrect then

its supposedly B

[short bay]

i guess you need to find the derivative of x in respect to t - to find the velocity function. And then find the integral v(t)dt from 0 to 5

x' = 3t^2-18t+15

oh it is the same function then after the intagration

correct answer is A

[stoic lantern]

No it's 39 I kinda figured it out

It's accelerating then retarding

Matches the answer key too

Oh my apologies that's my account

The one that posted question

[olive sable]

Hello there! I would like to ask these two questions:

1. Biology or Chemistry is a better career overall? Which one has better job opportunities and better salaries (specifically in Europe)?
2. If I want to get into the pharmacy industry (without being a pharmacist) which one (biology or chemistry) is better for that?

[past plover]

why would any integration or differenciation be required if the equation is given in terms of distance and time and we need to find the distance

i think if the question asked the velocity then we would have to differenciate the equation

the answers A tho

[split bridge]

You need to find derivative of x with respect to t.
This is velocity.
Find where velocity=0 and this will give t where v =0.
Where the velocity is 0,particle must have taken a turn.

Then add the distances individually by drawing path of motion.

Or use v.dt from the time period of start to where it turned and then from where it turned to where it reached
Both these integration have to be separate and under modulus since distance is positive

Anybody know how to easily write in Latex in Anki and Obsidian?

I downloaded a gitbuh code which is an Obsidian plug-in for converting text to Latex.
How do I enable this in Obsidian or attach this code to Obsidian.
I haven't used GitHub before.
Kindly help.

[trim fern]

We have to find the distance not the displacement so you’ll have to check if and when the velocity changes it direction

[short bay]

it's 39 you are right

[split bridge]

Are there any study rooms specifically for JEE?

[tacit condor]

Nope

Ask in study buddies
Make some
And all of u can join one room

[buoyant sail]

Can anybody explain me why does acid contain hydroxyl (OH-) ions ?????

[trim fern]

From what I understand
Acid don’t contain oh- ions but when you dissolve them in water they break into H+ and the conjugate base
Now there is some H+ ions in the solution but water dissociates to form H+ and OH- ions with its equilibrium constant equal to 10^(-14) which is the product of concentration of H+ and OH- ions
Now there are already some H+ ions in the solution due to the acid let’s say it’s concentration is 10^(-3) for example then the product of concentration of OH- and concentration of H+ is equal to 10^(-14) hence there will be 10^(-11) molar OH-

In short the OH- comes from dissociation of water into H+ and OH-

[sand coyote]

It seems there might be some confusion here. Acids typically do not contain hydroxyl (OH-) ions; instead, they release hydrogen ions (H+) when dissolved in water.

Here's a simple breakdown:

Acids: When acids dissolve in water, they release hydrogen ions (H+). For example, hydrochloric acid (HCl) dissociates in water to produce H+ and chloride ions (Cl-).

HCl
→
H
+
+
Cl
−
HCl→H
+
+Cl
−

Bases: On the other hand, bases release hydroxyl (OH-) ions when dissolved in water. For example, sodium hydroxide (NaOH) dissociates in water to produce sodium ions (Na+) and hydroxyl ions (OH-).

NaOH
→
Na
+
+
OH
−
NaOH→Na
+
+OH
−

So, to summarize:

Acids release H+ ions in water.
Bases release OH- ions in water.

[flat ledge]

Can someone explain to me how much mol O² is necessary to burn 24g of C?

basically:
C + O² -> CO²
with C = 24g

ik that I need to do
g

g/mol

but I don't know what value of g/mol I should take, C, O² or both.
C would make sense bc the other given value (g) is also given in C, but then again, the amount in mol of O² is asked...

(this is about the most simple example I could find. I did calculations like that before, but now that I'm revising everything, I've become unsure about it)

[trim fern]

You have 24 g of C, molecular weight of C is 12 hence no of moles of C is 24/12 = 2
The balanced chemical equation has equal no of moles of C and O2
Hence 2 mole of C would require 2 mole of O2
Molecular weight of O2 is 32
Hence 2 moles of O2 would weigh 2*32=64

[flat ledge]

Thank you very much. It's all clear now.

[nimble mortar]

can any economist in here explain what is a country's GDP ?

[signal stump]

can someone help?

[signal stump]

You add the sum total of all goods and the value of services produced in your country and get GDP

[solar badger]

tin hcl and nano2 is part of

diazonium

even cl3

cl2*

wait

yup

I would replace the diazonium

[thorny gyro]

You're still having problems?

[signal stump]

Na na, this was from the same day.
You sorted it out

[lyric dove]

Am i missing something or is there no correct answer?

[tacit condor]

There is no correct answer

Hunds rule violated in the last one

Otherwise it would've been correct

[cunning crescent]

B breaks Hund's rule

Only I can think of is that D is correct and that the order of the "boxes" doesn't matter. Can't remember enough to say if that's accurate or not

[lyric dove]

yea D violates the Aufbau principal but was somehow the correct answer for this practice quiz

nonetheless i think no answer is truly correct

[stoic lantern]

Yeah none is correct

[remote dragon]

is a single electron which is not in motion paramagnetic or diamagnetic or none?

[dire shuttle]

maybe cuz they are degenerate orbitals thats y D

[hexed bolt]

someone who studies genetics, can u explain what it topoisomerase

it's from textbook i use, but i don't understand it

[hexed bolt]

in case some of you were curious

it fixes entangled dna before helicase unwinds it

[remote dragon]

help pleaseeeee

[spark crown]

hi guys is someone here studying chemical engineering or is a chemical enginner please

[lyric dove]

None because the Heisenberg principle

u can’t have an electron that’s not moving

like remember that u can’t know the location and momentum at the same time

oops I meant to ping @remote dragon

[lyric dove]

.

[quartz comet]

you should not really look at that

what they want you to do is look at the magnetic propertie of an electron i.e. the spin of such an electron + magnetic moment

you should look at the properties of para and diamagnetism

where paramagnetism is kinda known for having unpaired electrons whom will eventually allign with an external magnetic field

if you look at those chemical principles, not very good at it tbh :D, there is one where an unpaired electron has an unpaired spin and therefore an unpaired magnetic moment --> alligning with an external magnetic field --> paramagnetic

[dire shuttle]

XD its ok

dayum is paramagnetic and magnetic property shown by a single electron cuz i thought it was shown by a molecule/atom

like i know diamagnetic can be shown by the electron spin

if you consider it as a magnetic dipole

[remote dragon]

thank youuuu

[remote dragon]

the question I saw said that we put electrons and protons (not atoms) on a surface then we apply magnetic field. which of them act diamagnetic and which act paramagnetic. idk maybe i don't understand the question correctly. I can't even translate the question or else I'd send it.

[lyric dove]

thx for the reply my guy

[quiet holly]

can someone help me derive transformer efficiency if we provide grid and solar supply and load is connected

[west yew]

η= p(load)/p(load)+p(loss) X 100%

[west yew]

efficiency if you include power loss during the working of transformer

[quiet holly]

thanks

[west yew]

👍

[thorny gyro]

what the difference b/w magnetic and dipole moment

[mortal turtle]

can anyone tell me if prostaglandin is a hormone or not?

[mild zealot]

how to calculate explosion momentum

[hazy burrow]

No, they can be produced in almost every tissue and not by an especific gland

[fast shale]

Hi is anyone here familiar with physics 2? Im having trouble with the course and am looking for help, thank you!

[quartz comet]

i think it depends a bit from uni to uni

but i can for sure help!

[silk lintel]

Bro thank god I don't have to take pchem