science-help

[night mortar]

my brain was not working for a min

[thorny gyro]

bruh 💀

@modest oracle

[night mortar]

ik ik

[cold arch]

If the message above contains a link to free nitro, it is most likely a phishing link. Please DON'T click on it to protect your privacy. You can notify the peeps by tagging them ( @peeps ) and they will take care of it as soon as they can.

[dusky vigil]

I don’t understand why W=△E
To be more precise, I don’t understand why the energy of work becomes potential energy or kinetic energy

[thorny gyro]

you mean the work energy theorem?

for this you will have to understand energy first

lets take potential energy for example because its easier to explain than others, potential energy or specifically gravitational potential : it is not a fundamental quantity an object always posses, it exists only when other objects are present, for example :what will happen if you hold a ball in space and release it, of course nothing will happen it will just float for as long as it is not interrupted but what will happen if you hold a ball at a certain height h above the surface of the earth, now, what will happen if you stop holding it? it will of fall, now while falling it displaced by this height h and hence, work was done, now it has fallen on the surface and can it displace further below the surface we don't exert a force other than gravity? one way for it to displace would be if we removed a part of the ground, but we are not doing it here so we can consider that the ability of the ball to perform work becomes 0 at surface, here we took surface as the reference point where h is taken to be 0

now the energy cannot be just directly created, you need to do work first, in the case of potential energy, suppose the ball as mass m and you lifted the mass by height h as in the original case, so what will be the work here? it won't be just m times h, because gravity is also making the mass accelerate, so the formula we obtain is -mgh the -ve sign is there because g is acting in direction opposite of displacement, this was the equation for work we did to lift the ball to height h, now what was the potential energy formula for when the ball is kept at height h? mgh, here -W=△U or we could expand this equation to write as -W=mgh-mg(0) so we get -W=mgh

[dusky vigil]

I feel bad for making you write all that

But…

How about kinetic energy ?

What’s the relation with work and kinetic

[thorny gyro]

energy is defined as capacity of an object to do work, but it doesn't appear out of nowhere, we supply the energy to the object by doing work on it , in the case of kinetic energy it is the work done to have an object of mass m travel with velocity v, if we do work A on an object then the object possess energy A and can do exactly work A if no external force acts on it, in case of kinetic energy : w = F.S, we have a equation for motion v^2-u^2=2as, getting the value for s : S= v^2-u^2/2a, F = m.a so expanding F.S we get :
M.a. Δv/2a, a cancel out giving us
K.E = 1/2mv^2

[dusky vigil]

I understand better now thx so much for your time <3

[midnight sage]

Energy is still conserved in fission and fusion, you are thinking about the law of conservation of mass. So far there hasnt been observed a process where energy between the system and the universe wasnt conserved

[zenith rose]

can someone help me with this question

[midnight sage]

This is probably getting too offtopic but energy isnt created by E=mc², the energy realeased during fusion was trapped inside that mass when those atoms were created from the BigBangs energy. That energy always existed, it wasnt created and thus its conserved

[mellow shell]

What's the difference between species richness and species diversity (Simpson's diversity index)

[thorny gyro]

you are just confusing me...let me get back at you after i verify with a reliable source

[thorny gyro]

<@&717391911132069929>

[thorny gyro]

💀 you are confusing me even more

energy is not created by that, the energy in e=mc^2 is the energy of rest mass, the idea here is that mass and energy are one of the same kind, and that can't be always used because relativistic mass is different from rest mass which is constant

[thorny gyro]

you know you are contradicting yourself....pls don't ping me anymore

[viral sorrel]

they are not, you seem to be quite confused by what e=mc^2 actually means

[thorny gyro]

okay okay i am not here for a fight
phy is not even my major okay
it's bio

so could you guys for gs stop pinging me

[viral sorrel]

not looking for a fight or whatever, but please avoid to answer a question if you don't know what you're talking about

[thorny gyro]

kay deal

[midnight sage]

Yeah lets drop the subject, we are too off topic :)

[thorny gyro]

okay 💀

not pinging you

[cunning crescent]

Write down the chemical reaction, convert pH to [H+] to find the end concentration. Convert everything to moles first, then back to grams to find the weight of potassium benzoate

[scenic drum]

can anyone explain this?

I get 560, but I don't know how the answer is 597L.

Resolved, nevermind.

[potent shard]

whats the equation for methane flux density

[unborn laurel]

Hi guys so next year I am going to be a year 11 student and I want to preview some of the work that I am going to do. My science teacher suggested me to take a Year 12 science course (I chose physics) next year but unfortunately that didn't get approved by head of faculty. This motivated me to focus on physics but I don't know where to start. It would be very helpful if you guys have any resources in AS physics or know where to find them. Thanks!

[thorny gyro]

I don't exactly get what AS is, but if its really advance level you could check out mit ocw

[unborn laurel]

I don't think it is that advance, AS is Y12 course and A is Y13 course, they are all cambridge

[rancid valley]

Anyone here speaks french ? I have a trouble with an exercise and it’s in french

[modest oracle]

Dm me

the question

[placid brook]

IGCSE bruh

[thorny gyro]

what

[placid brook]

I guess it's like board

[vernal cliff]

guys can someone help me how to draw V1 am quite confused because omega T has a value and there is no angular displacement

[modest oracle]

Instead of drawing the graph of V1 in terms of t, draw the graph of V1 in terms of t/omega, so that you don't need to express an actual value for omega

[vernal cliff]

wdym

So I just draw a straight line across and that's it?

Like this?

[modest oracle]

No, you should get a sine 🤔

[vernal cliff]

The equation only given to us was "Asine(theta)" where A is the peak amplitude and theta is the angular displacement

But idk what to do with this 100 omega T

[winged nebula]

You can find revision content/topic summaries about AS physics (and other sciences or humanities if you want) on physics and maths tutor which is a website - just search it online. There should also be GCSE content on there to help with your revision for year 11 too!

[modest oracle]

100omega compresses the graph horizontally by 100omega times

Watch a yt video about sine expressions

[vernal cliff]

watched a couple but it doesn't actually show you how to graph or draw it. they just explain theoretical parts of the equation which I don't need :/

[modest oracle]

Oh I'm so dumb I thought you wanted to draw the sine functions

mbmb

I studied phasor diagrams a year ago and totally forgot about them, sry

[vernal cliff]

Oh its ok

[unborn laurel]

Thanks I will try it

[grim gazelle]

any chem wizards out there

trying to figure it out

[grave onyx]

@grim gazelle

[grim gazelle]

ty @grave onyx

[balmy parrot]

Guys, can someone explain me what are dissymmetric molecules with an example?

[spark plaza]

if we know that V=J/C, does that mean that if we want to increase the voltage, we would have to get the electrons to a higher energy state at first?

[thorny gyro]

hi, is the output signal from a driver to a motor PWM voltage or current, like in the real physical sense. Or the signal is driver-dependent?

[robust mantle]

Does the specific resistance of nichrome remain constant with increase in temperature or is it an exception?

Edit: it's an exception

[hallow palm]

can anyone IUPAC name this? I just had this on a test today and I couldn't even begin to process it.

[sleek fossil]

MOOcoohME ? Jk idk

[night mortar]

just the answer plz

[tawdry crescent]

a: root(13) and root(52)
b: 3(root(13)+root(52))

[modest oracle]

Actually the center of mass of the two masses moves with a velocity of 3î - 1.5j
(It's the point at the middle of the segment that links the two masses)

[shadow thunder]

anyone doing A level chemistry and is in the first year ?

[tawdry crescent]

ah, my mistake. Yes, in that case, it would be 3i-1.5j. Thank you

[thorny gyro]

guys is the trend in the metallic character the same for transition elements (like s and p block) or is it different?

[copper mural]

Hey
Is bromine considered as a bulky group while observing ortho effect in benzoic acids ?

[thorny gyro]

listen here

i need to get this help on this shit quick

send me dm within 5 minutes if u willing to help me out

im talking about a buffer solution question

if its past 5 minutes leave it

[modest oracle]

Wow 5min, that's quite a short wait time to ask for
Any particular reason ? 🤔

[zenith rose]

Can anyone help me with this?

[cerulean zodiac]

mi= 0.3 kg mo= [ls seNd solun0

someone pls send solution

[thorny gyro]

can someone help me with understanding this question

since theres no curvature and the root tip has been removed, shouldn't there be no IAA/auxin present in the root tip? what am i missing?

[thorny gyro]

here are the mark scheme points but i still dont get it

wait i think i got it

[abstract raven]

help plss

[thorny gyro]

Valency is equal to the blank of cation or anion. Can anyone tell me the answer ?

[cunning crescent]

Charge

[young quarry]

assuming the iceberg is pure water, the density would be 1kg/m^3

[viral sorrel]

ice density is different from water density (it's less dense) also the water desnity is 1 ton/m^3

[thorny gyro]

they really should have specified the temperature there

[viral sorrel]

yes but let's assume it's 0 °C

[thorny gyro]

ok

[viral sorrel]

1. ice density is 0.917 g/cm³ or 917 kg/m³ at 0°C
2. the force remains the same, it's the pressure that changes (P=F/A)
3. use the archimedes' principle konwing that 52 grams are being pushed

interesting fact: the 3rd is a thing that Archimedes actually did to find out if a crown was actually made of gold

also gold density is 19.3 g/cm³

[vernal cliff]

uhm can someone clarify my question regarding fhlemming left hand rule

The direction of force will only go eighter above or below right?

Oh nvm it actually varies

[thorny gyro]

yeah he put that in water if I am not wrong

[vernal cliff]

Guys whats the meaning of polarity in this given figure

I mean using flemming left hand I can ans this but its asking for polarity

[thorny gyro]

is there any text under the figure, it is looking really vague

[vernal cliff]

yah wait ill send the question

the polarity of the
magnetic system in Fig. 8.15(d).

its just this

the other parts I answered it already

a-c

but this ones seems to confused be by using in terms of "polarity"

this is thesolution ans

I don't get the difference

[thorny gyro]

I think this question is incorrect because you can't just split the poles like that

[vernal cliff]

?

thats in the textbook

it cant be wrong

[thorny gyro]

I get it now

[thorny gyro]

well I think it only required north and south pole as the answer, doesn't depend on which side each pole is, because if it was north and north pole or south and south pole then the field would look like the below image , and over there if we used left hand rule then the current would flow in different direction than what was given

[vernal cliff]

how did it know north was on the right sidde

[thorny gyro]

it makes no difference weather the north is in right or left

only that the 2 poles should be unlike

[vernal cliff]

oh ok thnks

[cunning crescent]

<@&717391911132069929>

Discojd lol

[red scroll]

In bio in order to accomplish the bacterial conjugation, is always nessecary the F factor?

[thorny gyro]

how do i do part e

[modest oracle]

The electrical force is vertical, so the horizontal component of the electron velocity is not affected (the horizontal speed is constant)

So delta t = delta x / v

[thorny gyro]

but what is delta

x

oh wait i worked that out

smh sorry sorry

thank you so much!

[modest oracle]

Oh I've just realised that the distance between C and D is only asked in the next question

[thorny gyro]

oh wait ye

[modest oracle]

So maybe that means you were supposed to use another method

[thorny gyro]

∆x is wrong then

so what should i do

[modest oracle]

Use the vertical component instead

[thorny gyro]

vsintheta?

[modest oracle]

Yep

And the vertical displacement

The electron vertical position relative to time describes a parabola

[thorny gyro]

so sy=ut+1/2at^2

?

and the u is the veritcal velocity component

is this correct

[modest oracle]

if sy = vertical position
and u = initial vertical speed
Yes

[thorny gyro]

ok ok ok

thank you so much

[modest oracle]

Compute the roots of that expression : sy = 0

And you'll be able to solve for t

[thorny gyro]

yep

tyyyyyyyy

[modest oracle]

Np !

[thorny gyro]

wait quentin

@modest oracle

im a little confused, if sy = 0 then wont time be equal to 0 too

also i think i calculated sy wrong

what did u do?

as in your steps

mr quentin?

just read ur profile ur a busy man my apologies for my impatience

[modest oracle]

Np man I was just sleeping

[modest oracle]

The equation is a second degree polynomial, therefore it might have two roots (t = 0, which is logical, and another one you must calculate)

The answer for the time taken to go from C to D is that second root

[thorny gyro]

ok yep got it

@modest oracle thank you so much sir, you saved my day

[modest oracle]

You want to know when the electron crashed against the border if the field. I just conveniently defined sy=0 as that border

Np, I'm glad I could help !

[thorny gyro]

yes ofc you helped, my homework is now complete

[rustic wedge]

how can I answer this

@modest oracle

[tawdry crescent]

its 321

as for explanation

ignore the concept of normal force here. just know that the force of friction is enough

for block 1, even though part of force 1 is helping force 2, the block isnt moving. this means that the magnitude of static friction has to cancel out both of them

for block 2, the magnitude of static friction is equal to f2

for block 3. f1 and f2 are fighting each other, easing the workload on poor ol' static friction and allowing it to stay small

[rustic wedge]

ohhh

thanks bro ily

[vernal cliff]

can someone try this in their calculator

I seem to be getting 8/5pi

[split crater]

8/5 and 1.6 is the same result. is't it

[vernal cliff]

oh yes it is

mb

[split crater]

it's okay everybody does make mistake

[stable sand]

anyone know about commissural fibers?

neuroanatomy?

[thorny gyro]

does anyone have any tips to get better at projectile motion questions (physics) for some reason i cant get the hang of them no matter how much i practise.

[modest oracle]

There are at most 5 formulas to remember, and the matter is quite easy. It just all comes with training (and understand what you do & why you do it)

[thorny gyro]

how can i understand the whys the best way

because i know all 5 equations and even some derivations

yet i keep getting questions wrong

[flint mauve]

anyone know a good website where i can download scientific academic poster templates for microsoft word?

[vernal cliff]

there are some problems where L is not negative to find emf and some that are negative
read through thewhole book and compared problems where L are postivitive and negative for emf
and cant seem to find out why

[viral sorrel]

https://en.wikipedia.org/wiki/Lenz's_law

[sleek fossil]

How d fk do i hide this shit

[cunning crescent]

If you're on mobile you can long press the channel and press mute

[ashen horizon]

Mute it and then also collapse the group of channels

[sleek fossil]

Thanks guys!

[thorny gyro]

Question 4 sub question 4

[fading steppe]

800 cos30

@thorny gyro

[severe palm]

so i need to find vertical velocity but all i have is the x, the time, and the horizontal velocity. it's for kicking a ball, truly no clue how to find this

[thin pendant]

can i see the picture of question

[thorny gyro]

@fading steppe tq

[vernal cliff]

guys for b

energy is = VIT

but i dont have time

how to I get energy

oh nvm

total energy is 1/2 cvsquared

[thorny gyro]

For part b how is the radius 1m?

[modest oracle]

There's no mention of the radius in the answer

[thorny gyro]

so then how can i do the question

since angular velocity is s/rtheta

and s=2pir

lmao am i dumb

[modest oracle]

You're told that one full revolution is done every 9 seconds

[thorny gyro]

ok so that gives us the period

[modest oracle]

Therefore delta Theta = 2pi (a full revolution)
And delta t = 9

[thorny gyro]

ahhhhhhhh

ok ok ok so r is not needed here?

[modest oracle]

Okokok imagine

A carousel that's 1m long

And a carousel that's 100m long

[thorny gyro]

ok

[modest oracle]

Both have have the same period

[thorny gyro]

yep

[modest oracle]

Does the 1m carousel spin faster than the 100m one ?

[thorny gyro]

yes

i think?

or maybe im dumb

[modest oracle]

Why ?

[thorny gyro]

because radius is smaller

and period is same

?

thus to make same rotation per time it must move faster

[modest oracle]

Ok you take a bucket of paint and make a small mark on the side of each carousel

[thorny gyro]

i think

ok

[modest oracle]

How long does it take for the mark in each carousel to go back to its original position ?

[thorny gyro]

9s

ohhhhhhhh

[modest oracle]

For both ?

[thorny gyro]

same speed

yes

for both it takes 9s

i think lmao am i missing something

[modest oracle]

Doesn't that mean that they rotate at the same angular velocity ?

[thorny gyro]

yep ok ok ok so their radius makes no difference

[modest oracle]

Absolutely no difference

[thorny gyro]

ok so we can say the radius is independant

?

but i still dont understand why they did not use r for the equation. sorry im dumb lol

[modest oracle]

Angular velocity could be calculated via the radius in some cases, but that's not always the case. Here, you definitely don't need it, because you've got much better info : the period of revolution

[thorny gyro]

ok and since the radius makes no difference we would just use our period of revolution

?

and we can also relate this to the fact that the units of ang v is rad/s

right?

cause one rotation is 2pi

and per sec is just the time

[modest oracle]

Angular velocity is defined as the variation of an angle's value every second.
But angles don't depend on lengths

Yep and w's units are rad/s, so that shows that using a length (at least without using another length to cancel them out) is just wrong

[thorny gyro]

oohhhhhhhhhhh

so in actuality, w is a change in angle per time which is not dependent on length

and r gets cancelled out in the equation anyway

is this correct @modest oracle

[modest oracle]

Wrong, there's no r in the first place

I'll repeat

Angular velocity only depends on an angle's value and time

[thorny gyro]

so then why is r in the equation in the first place?

when you sub in the equation for change in angle

[modest oracle]

There's no r in the first place

[thorny gyro]

ok ok let me explain where i think i am getting things wrong

so we know that w= deltatheta/t

correct?

now if we take the equation for delta theta

which is s/delta t

and now sub this into the angular velocity equation

we would get s/r delta t

and then

oh wait

its a circle

[modest oracle]

s = 2pi r

[thorny gyro]

yea

so r cancels out

LMAOOOOO

[modest oracle]

So the r's get cancelled out

But you don't even need that

[thorny gyro]

omg im so sorry quentin for my incompetence

oh?

[modest oracle]

Like yeah it works

But there's an easier way to do that

In a full revolution, delta theta is 2pi

[thorny gyro]

yep

[modest oracle]

No matter the radius

And delta t is given

Boom, w = 2pi / delta t

That's it

Because angles can be measured using particular lengths (eg. r and s)

Bur you don't absolutely need lengths to measure angles

[thorny gyro]

oh so we can just sub in the 2pi since its a full 360 degree rotation

[modest oracle]

This angle's value doesn't depend on the lengths of the colored lines afterall

[thorny gyro]

no they do not

[modest oracle]

Yeah, delta theta is 2pi

No matter the radius

[thorny gyro]

yep yep yep yep yep

[modest oracle]

So, why would you need a formula to calculate a value you already know ?

[thorny gyro]

very good point mr queintin

[modest oracle]

(Talking about delta theta

[thorny gyro]

yea yea

thank you so much sir

i cannot express my gratitude

[modest oracle]

Just call me Quentin, I'll settle with that haha

[thorny gyro]

oh ok ok

you should genuinely ach professionally sir

may i call you sir?

just out of respect thats all, since you have helped so many

[modest oracle]

So yeah, you've just learnt a new formula :

w = 2pi / T

Where w is the angular velocity [rad/s]
and T is the period of revolution [s]

And it works for any radius

(Or even if there's no radius involved at all)

[thorny gyro]

yep because its one whole revolution

thank you so much once again sir

[modest oracle]

So, now that you know it, if you need to calculate the angular velocity of something that makes a third of revolution in 5s, you won't be stuck on the problem by the "lack of info regarding the radius"

[thorny gyro]

yep just one thrid of 2pi replaces delta theta

2pi/3 for short

[modest oracle]

Exactly, delta theta = 2pi/3

[thorny gyro]

sir i am in your debt

[modest oracle]

So the angular velocity is 2pi/15 [rad/s]
And boom you're done

[thorny gyro]

thank you so so much

[modest oracle]

Np

[thorny gyro]

i am truly grateful

[frail crest]

how is it similar and different

[proven granite]

what?

[outer hemlock]

How calculate #2 without mass

[proven granite]

it's 8m right?

[outer hemlock]

Yea that’s what I was thinking @proven granite

[proven granite]

the speed of second golf ball after collision is 4m/s

[outer hemlock]

Yes

I just thought it was odd

No mass

[thorny gyro]

they want to test to see if u know the equations and if you can apply it to a general case to check concept

[vernal cliff]

how can I ans bcd

I can get the kinetic enrgy for hammer but what do I do with the weight of the pile

[proven granite]

resistive force of the ground if the pile is driven 150 mm

into the ground

[vernal cliff]

u just read the question

what I did for B is 1/mv^2 but what do I do with this 290 kg

[proven granite]

I guess when the pile is driven into the ground you gotta add the weights

because even the hammer is going along with the pile

[vernal cliff]

nvm I got it

[wheat zealot]

yea im getting 8M and 4ms-1

[sudden cedar]

I get a feeling this is quite basic knowledge but I can't seem to wrap my head around it - does anyone have any explanation/analogy for what current, potential difference, charge, resistance and voltage are or how they work? Or even a link to a website/video that explains it well? Any help would be amazing - for knowledge reference I'm in year 11 (UK) which I believe is the equivalent of 10th grade/sophomore?

[safe brook]

Anyone know how to work out last part?

I missed the class so i didnt catch it

[thorny gyro]

density equation:

p=m/v

use displaced mass

p=7800

m=3.0x10^-3

v=m/p

blah blah u can sub values

@safe brook

[safe brook]

Thank you, I just really don't understand where it's coming from, the part where the ice and iron is mixed is confusing me

[proven granite]

suppose

there's 2 containers
One is filled with water at a higher elevation and the other container is empty and at a lower elevation

Now we connect those two containers with a pipe

water starts flowing right?

now similarly, let's think
The filled container is a battery with some potential

the difference of "water" can be thought as the electric potential difference or voltage

Now current is the rate of flow of charges per unit time.
In this case think of it as the rate of flow of water per unit time

Now suppose the pipe is a little blocked or a little clogged

Water will flow slower compared to a clean pipe right?

Now resistance is just that

The ability to oppose the flow of electric charges
Or the ability to oppose the flow of water in this case

note: here water flows with the assist of gravity
There is no assist in electricity

[proven granite]

Can anyone help me in understanding reaction mechanisms and all that in organic chemistry

[hoary stirrup]

How do I memorise chemistry radicals in one day?

[thorny gyro]

heres the fun part, u dont!

[proven granite]

if you know valency of each element in the radical you can sorta figure it out

Like NH4+ or OH-

And anyways as you read more chemical equations it becomes common

[spice quest]

alakh pandey ka playlist krlio rxn mech ka, mast hai

[proven granite]

theek hai bhai

[muted stump]

Direct formula for calculating wavelength for transition between two states is 1/wavelength = R(1/n1^2-1/n2^2) where R is ur ryedberg constant

Then could u tell how u got the wavelength of those two lines

[warm jewel]

does anyone here study electrical engineering ?

i'm trying to calculate I_x. Using that I_x = I_1 + I_4 , i already calculated I_1, now I'm struggling to calculate I_4

[modest oracle]

I need someone to check what I'm about to say (haven't touched elec stuff since last year) but I think that the current that goes through R2 is also Ix

[wheat zealot]

wouldnt current split?

[warm jewel]

okay i have actually figured it out, thank you ! The key was simply to use the fact that R3 and R4 are parallel ^^'

[wheat zealot]

what does the "u" indicate?

[warm jewel]

it's the tension!

[wheat zealot]

meaning voltage?

idk this is new to me, and also i dont study electrical engg. sorry for bothering you!

[warm jewel]

you're not bothering me! yes voltage

[cyan mango]

im in year 12

watch freesciencelessons on youtube

he explains it very well

[sweet belfry]

answer says downwards

can someone explain pls

[wheat zealot]

flemings left hand rule

i think

[wheat zealot]

current is in teh direction opposite to that of movement of electron

the fields are into the plane

so the thumb points down-wards.....idk if it is right or it helps but there

[sweet belfry]

oh ok so direction of force=direction of electric field?

[wheat zealot]

i suppose thats it...

[viral sorrel]

if you mean coulomb force then yes

[zenith rose]

can anyone help me solve this question

I have solved a and the abbreviated version of iron but I dont know how to predict the likely charge of Iron

[thorny gyro]

Does it want electron config in spdf form? @zenith rose

Oh u solved a my b

Iron is going to be either +3 or +2 since it is a metal and loses electrons (cation)

Ions form because they give better stability than ground state atoms but it need not be perfect stability. Both ions give better stability to Fe than the ground state atom.

[wheat zealot]

youve answered perfectly wrt the question

[thorny gyro]

No no he has done part a

@wheat zealot

[wheat zealot]

i meant for the part b itself, your explanation was good imo

[thorny gyro]

Oh thank you so much i thought it was sub par at best tbh lmao @wheat zealot

[wheat zealot]

i mean, your explanation was short and to the point and hence good.....now you cant go explaining everything right 😂😂

it was good enough to help a person formulate their own detailed answer

[thorny gyro]

Well obviously I’m not gonna do it for them

Plus that’s not even allowed

I thought if i give them the main points

They should be able to write an answer

@wheat zealot

[wheat zealot]

yep, and you did give them exactly what is needed to make a nice answer

[thorny gyro]

Mhmm ‘twas the goal

[cerulean elbow]

Does NO2 has odd electron bond?

[thorny gyro]

How do i do this one. Don’t tell answer pls just method

[wheat zealot]

zero

as work = F.S COS(theta) and here, cos 90 is zero

[dim grove]

does anyone here have alevel physics coursebook cd-rom pdf?

[raw socket]

"Assume that 20% of the molecules in the air are
oxygen molecules and the remaining molecules are nitrogen. Calculate the mass of air in the room."

[modest oracle]

Calculate the mass of one mole of air particles (in kg/mol) using the molar masses of O2 and N2 and their molar coefficients (20% and 80%)
[Hypothesis : air behaves as a perfect gas, the room temp is 298K and the room pressure is 1bar]
Using pV = nRT, you can calculate the volume of one mole of air particles (V/n expressed in m³/mol)
The reason I calculate V/n and not V or n is that both are unknown, so it's impossible to get an absolute value for either of them

Therefore, you have the molar mass (in kg/mol) of the particules of air and the volume of one mole of air (in m³/mol)
Divide the former by the latter and you get an answer in (kg/mol) / (m³/mol) = kg/m³

To calculate the total mass of air in the room, you first need to know its total volume

Is that the kind of results you were expecting ?

(correct me if I'm wrong, I answered in a rush)

[thorny gyro]

help pls

[willow lion]

"A streamline is a line that is tangential to the instantaneous velocity direction (velocity is a vector, and it has a magnitude and a direction)." What does it mean by tangential?

[surreal shore]

letter A, anyone?

[surreal shore]

It means the line touches the object at one point only, I'll get you a pic for better viewing

[willow lion]

For calculating pressure, If pressures act against to each other they will minus instead of add? Aren't they scaler though?

[willow lion]

I kind of get it.

[raven glen]

hey- anyone who has taken organic chemistry- does density ever have a unit of grams/mol?

[thorny gyro]

<@&717391911132069929>

[cunning crescent]

g/mol is the unit for molar mass

So it is not a unit for density, as it soes not account for volume. It is per mole, which is a number, and how spread out atoms are from each other or the volume of each atom does not affect molar mass.

[raven glen]

Thank you! That’s what I thought too but the sample properties table for my organic chem lab has the density units at g/mol 🤨 so I was just checking if it was some weird thing or just a typo

[cunning crescent]

Yeah don't click that link

[craggy cobalt]

i mean you can click it just don't input any of your actual information

[spiral plinth]

anyone?

i hope this question is not too advanced for this channel

[crimson pivot]

why does a diatomic atom [for example hydrogen] need to have 2 of itself?

hydrogen becomes H2, but why? is what i don't understand

[nimble turtle]

on its own hydrogen is verry reactive, that isnt the case with a "filled" hydrogen with 2 valenc electrons on its most outer "shell"

basically there are verry few H1 out there but as soon as it can react with something it will bond to either the other reactive element or another H1

[crimson pivot]

ah, so it is that hydrogen get's its first valence 'shell' [i think its called] filled?

[nimble turtle]

yes

every atom in this universe wants to be "happy"

and it can get "happy" only with ripping electrons out of weaker ones or bonding with other Atoms to form molecules

[vernal cliff]

can anyone help pls

[noble karma]

Hello, I have lauched an Instagram page related to neuroscience, genetics, bioinformatics... If you are interested in, please follow me on Instagram 🙂 Here is the link : https://www.instagram.com/hypcerpark/?hl=en
Thank you 🙂

[left light]

Can someone help me with my research for biology. How can humans be possibly benefited with the de-extinction of heath hens?

[half orbit]

Hi, this is solved by using the Maxwell Boltzmann distribution. Basically, you have to construct the partition function Z for your system, which is to be considered a two level system(ground and first excited state). I'm assuming the question assumes that you know that the ground state of Na is non degenerate, while the excited state has a twofold degeneracy. Then Z = 1 +2*exp(-E/k_bT), and the given fraction is exp(-E/k_bT)/Z. Here E is the Energy of the first excited state of Na(about 2.11eV), k_b boltzmann's constant and T = (300+273.15)K. Hope this helps

[mossy adder]

Does anyone know how to solve this i don't know where to start or rather what relations to use in order to solve this (thermodynamics problem)

[spiral plinth]

broo thank you soo much <3

[viral sorrel]

is this a perfect gass?

also what's y here

[mossy adder]

yes, i guess y its this

[viral sorrel]

oh ok

[viral sorrel]

ok so you need to use the firstl principle of thermodynamics (U=Q-W where Q is heat, U internal energy, W work) dQ=cpdT, dU=cvdT, dL=pdV (note that some of these formulas aren't always true, it depends on the case) and the status equation of a perfect gas pV=nRT

[naive sphinx]

Hi

[modest oracle]

Hi

[thorny gyro]

How does activation energy affect whether a reaction is reversible

<@&717391911132069929>

Why so many fake gifts tho

[modest oracle]

Because there are people that fall for it

[thorny gyro]

How tho, like it looks fake

[sonic bay]

when u become desperate. u hallucinate

[dusky glacier]

its basically law of inertia; if you want an analogy

if you need more energy to do something, you tend to avoid it or feel it to be expensive process

now, talking about irreversible reactions; since the products so formed are so stable they prefer to stay that way and not go back to its reactants

[modest oracle]

It does, but some people are too young or too naive and not aware of these kinds of scams

[thorny gyro]

Fair point

[thorny gyro]

Oh ok ok ok ty

[thorny gyro]

<@&717391911132069929>

[sour moat]

hello, can someone explain what's the myelination process in the CNS and PNS?

[mossy adder]

Hello guys i have this two charges and a= 50 cm how do i discover the nullpoint of eletrical field? (Eletromagnetism)

[snow tulip]

So you have to find the point where electric field is 0. Use coulomb's law in formula form. you get 2 equations when added together is equal to 0. Solve the quadratic equation to get answer

[mossy adder]

Can you confirm the value that i get : a +x , a= 0.5 & x = 0.86 Solution : 1.36

[snow tulip]

yes. got the same value for x

[mossy adder]

the point where the electric field is 0 is unique or it can exist more than 1 point?

[snow tulip]

only one null point exists in an electric field

[sleek fossil]

Can some1 explain misogynistic signal transduction to me , I searched google but nothing is going inside my stupid brain , pl tag/ping me if. U answer

[gloomy girder]

Hey, guys! During free fall, when do I take gravitational acceleration as positive and when do I take it as negative? I used to think that when an object is going upwards, we take it as negative because g acts against the motion, and we take it as positive when an object in going downwards because it acts with the motion. Apparently that's not always the case tho. Help :/

[modest oracle]

It totally depends on how your coordinates axis are set

Sometimes we set the z-axis as pointing upwards because the altitude grows in that direction

Sometimes we set it pointing downwards (eg when dealing with falls) so that we get positive values for the velocity and acceleration

They're both valid, but you need to be clear about the orientation of your z-axis (towards the center of the Earth or in the opposite direction) before making any calculation

[gloomy girder]

Got it! Thanks boss!

[sleek fossil]

It’s mitogenic !! Damn auto correct !

[thorny gyro]

hello there :))
Does someone have an idea on how to prove the laws of newton in a physics experiment? We have to come up with the whole practical (doable in school) and need measurements, but i just cant think of anything 😭
help please :/

[thorny gyro]

Hi

Biochemists are here?

maybe i can help you about your biochemistry questions.

[upbeat gulch]

yo guys, quick chemistry stoichiometry question: Can a mole ratio be between two products in a chemical equation?

[thorny gyro]

i think so

[thorny gyro]

i have a question

lets say we have a hydrogen atom, so one proton and one electron. how come the electron does not loose energy and fall into the nuclues ( i am considering the bohr model here, but should i be using the schrodinger one and should think of electrons as waves?)

thank yo

u

[vernal cliff]

guys can u just give me a hint on how I can find the final temp when I only have initial vol and preassure
I will just use charles law and assume that vol is constant?

3. A gas is stored in a cylinder that has a volume of V3 litres.
   The gas is stored at temperature T3 and pressure P3. The gas is
   then released into the air. Calculate the final temperature of the
   gas and the polytropic process index value ‘n’ of the gas.

[modest oracle]

Bohr's model is flawed, and that's part of why quantum physics exists
(ping & correct if I'm wrong pls)

[cunning crescent]

50% of chemistry is just being told the previous atomic model was flawed and learning a new more accurate one every semester

[viral sorrel]

yes, the electron is actually on its lowest level of energy

[thorny gyro]

So it is best for us to use schrodingers model?

[half orbit]

Hi, that's a great question! In fact, this is the reason Bohr's model came to life. Classically, the electron would lose its energy in a VERY short time, spiralling onto the nucleus. As a consequence, all of matter would be unstable. Since matter is stable, it can't be so. So Bohr, without any particular good reason other than to justify the stability of matter, assumed that only certain orbits are allowed (thus preventing the continuous spiral motion that would make the electron lose its energy). He quantized angular momentum, but that was a trick. Only later it was shown that this is precisely what you get with a full quantum treatment of the hydrogen atom. I would not say Bohr's model is wrong, since it predicts the correct energy levels, but it's surely incomplete at least in its conceptual foundations. A full quantum mechanical treatment, as said, yields the same energy levels and leads to quantization of angular momentum, but one has to abandon the concept of "orbit" since it violates the uncertainty principle. Hope this clears things up a bit:)

[thorny gyro]

thank you so much!!

[severe sapphire]

I have a quick kinematics problem for yall

at t=0 train 1 is at position r=0 with velocity v1.Train 2 is at position L with velocity -v2 (v1>0 v2>0. L>0). While t>0 train 1 moves without acceleration and train 2 moves with acceleration a
1)what should a2 be for the trains to not collide
2)what should a2 be for the trains to collide while they are moving to opposite directions

[jagged venture]

hii really confused about this one about physics Sugar and Yeast Fermentation :,D

[thorny gyro]

does anyone know units of gravitational field strenght

[willow lion]

you mean downward acceleration by gravity? it is 9.81 m/s2

[thorny gyro]

no

[thorny gyro]

gravitational field strenght

[willow lion]

the force in newtons (kg⋅m⋅s^−2) gravity exerts on something is equal to an objects mass multiplied by gravity and it is in the units of N

[thorny gyro]

from newtons universal law of gravitation equation?

oh lmao ur right

@willow lion

i just derivied it smh

[willow lion]

👍

[merry comet]

can anyone solve this and explain it?

[merry comet]

did you try the ideal gas law? It can be solved by that as the parameters are directly stated

[severe sapphire]

how to do I sketch the vectror of jolt on ucm?

[tawdry crescent]

v2(v1+v2)/L = a. Literally anything less than that wold cause the trains to crash

[tawdry crescent]

hmm, what is w? Oh work nvm. So, we're given that the balloon is spherical. The derivative of volume would be surface area, so you get dw = pAdr or p(4pi*r^2)dr. Once, you know what P is (pressure I think), of which I'm not rly sure what it's supposed to be, integrate and substitute radius which can be found by dividing circumference by 2pi

[merry comet]

directional acceleration?

[zenith rose]

can anyone help me with this?

[merry comet]

2O2 + CH3COOH = 2CO2 + 2H2O

[wary inlet]

hii can anyone help me with physics?

I need help figuring out which parts of the question is its type of energy

[zenith rose]

appreciate it

[thorny gyro]

A use formula for kinetic energy

Ek= 1/2mv^2

Part b use gravitational potential energy formula

U =mgh

Part c

Mechanical energy = potential + kinetic

Do same steps for q 4

[severe sapphire]

thanks a lot for the help

got anpther dynamics question for everyone

so the mass of the object is m

and its sliding down a slope with angle theta

with friction μk

its velocity at t=0 is v0

under what condition will the sliding of the object stop

there is not other force acting on it aside from the friction gravity and its velocity

any help is welcome

[tawdry crescent]

coefficient of friction has to be greater than tan(theta)

[severe sapphire]

do you wanna explain a bit?

oh nvm i get it thx

[thorny gyro]

yo

anyone here doing pharmacy

studying at university or working?

[merry comet]

what will be the velocity so that the particle touches both adjacent vertices of cube.

[thorny gyro]

Guys,what does this mean "the properties of elements are the periodic functions of their atomic numbers?"anyone pleaseee

[merry comet]

the characteristics of elements are related to the periodicity of elements, (repetition of characters after a specific period, or the characters of the elements in same group/periods are same

[thorny gyro]

Thank youuu

[viral sorrel]

can you provide the text for this?

[ruby sequoia]

hey. there's this physics question that i did not understand. i will post it now

right so maybe it's because english is not my first lang but..

what does it mean "wire in the direction into the page".

what's the page? the exam page? what?

idk. anyone who understands plz explain and thanks in advance

[viral sorrel]

it means it's directed inward

you have to imagine that the wire is perpendicular to the page and the current is flowing from you to the page

[merry comet]

I wish I had, but this is question our teacher asked us. he explained it, but I could get it, so I missed.

[merry comet]

the examiner should have used word plane instead of page.

[merry comet]

well yeah another information I forgot to mention was theta= (tan^-1) sqrt5

and the question is asking the velocity with which it has to be thrown, in terms of a and g

I am sorry I didn't type the question right @viral sorrel

[zenith rose]

can anyone help me figure out what this is?

[cunning crescent]

Its a chemical🤪

On a serious note, I dont remember nomenclature that well but I think, it's 1-methyl, 4-buthyl oct-2-ene.

The way to go about it is to find the functional group, and the longest chain, and count so that you get the lowest numbers for the functional group and the side groups possible

[merry comet]

5-(3-methylprop-2-ene)nonane?

[thorny gyro]

Yeah that's true

But 4-buthyl 2-methyl oct-2- ene

[uncut crescent]

yes this must be the answer i think

[uncut crescent]

ah ye this also makes sense

[prisma moss]

Uh

Can anybody explain to what's an isotope

I forgot

[uncut crescent]

same atomic number, different atomic mass

[thorny gyro]

carbon-12, carbon-13, and carbon-14 best example

[prisma moss]

Oh oke

[thorny gyro]

this ^

[uncut crescent]

ye

[thorny gyro]

saincintist

[thorny gyro]

wouldnt it be 4-butyl-2-methyl oct-2-ene

[thorny gyro]

alphabetically butyl comes before methyl

[prisma moss]

Can yall explain

[thorny gyro]

what to explain

[uncut crescent]

ye according to me, what i thought, was this

but then longest chain would be with 9 carbons right

[thorny gyro]

ths ^

[uncut crescent]

but there was a rule for same number of carbons on each side. let me check

oh fuck

[prisma moss]

The second photo

[uncut crescent]

never mind yes

i misread

someone's answer

[thorny gyro]

with most prefix ones is considered

[uncut crescent]

it's supposed to be this

i thought someone wrote nonane

my bad

[thorny gyro]

its okk we r hoomans

[thorny gyro]

ye but u need to get the alkene

[uncut crescent]

yes yes

[uncut crescent]

what to explain in this

activity?

[prisma moss]

No the paragraph in 2nd photo

[thorny gyro]

yayyy i revised a concept of iupac thnks

i forgot mendeleev's law lmaoo

[uncut crescent]

mendeleev's table was based on atomic mass

[thorny gyro]

it was about atomic masses right

[uncut crescent]

ye

and isotopes of SAME elements have different atomic masses

[thorny gyro]

ye

so he had difficulty to where to put isotopes in his table

[uncut crescent]

the reason i dont remember now

[thorny gyro]

@prisma moss essentially that some elements exist also in isotope form so mendeleev could not put them in his table- this is an issue for the modern periodic table as well. also the atomic masses dont have a constant increase like hydrogen mass is 1 but helium's is 4, so it was hard to predict how many elements can come in between 2 elements which isnt an issue in modern periodic table

udita and fletch, add onto this or correct me if im incorrect

[uncut crescent]

i dont think this was the problem for modern periodic table though

[thorny gyro]

purrfect

[thorny gyro]

ye

[uncut crescent]

because it was based on atomic number and not mass

[thorny gyro]

ye

[prisma moss]

I see my doubt is cleared

[uncut crescent]

nice

[thorny gyro]

which problem

does he had issues with noble gases doe- i dont remember

[prisma moss]

Thank you @thorny gyro @thorny gyro @uncut crescent

[uncut crescent]

" essentially that some elements exist also in isotope form so mendeleev could not put them in his table- this is an issue for the modern periodic table as well. "

[thorny gyro]

ye because

isotopes arent in the periodic table are they?

[thorny gyro]

not in modern periodic also

its still a problem?

"Based on periodic law an isotope is an element which must have a separate place in the periodic table. However there are no places for isotopes in the Mendeleev periodic table. Since isotopes have the same atomic number they haven't been given any specific position in the modern periodic table.'

got this off of google, explains better than i did lmaooo

[uncut crescent]

yes right

makes sense i misunderstood what you were trying to say.

[thorny gyro]

ayoo but isotopes are not in modern periodic table also

[thorny gyro]

that's what i meant :p

[uncut crescent]

have you done s-block

i have a doubt

[thorny gyro]

ye that means it is still a prob

[thorny gyro]

nu i jumped straight to p block

[uncut crescent]

it's not though

[uncut crescent]

oh lmao nice

udita have you done s-block

[thorny gyro]

yesh

done

[uncut crescent]

how are alkaline metals more metallic

or they are not

because atomic size decreases--> metallic decreases

[thorny gyro]

Methyl 2.carbon-bound

[thorny gyro]

they r shows the trend

[uncut crescent]

but in my skool ppt its written alkaline more metallic

how this possible

[uncut crescent]

explain please

[thorny gyro]

?

isnt methyl group attached to the second carbon in the chain

[thorny gyro]

no alkaline earth metals r more shows the google

Ah sorry

I wrote wrong yu re right

no worries :D

[thorny gyro]

see u r seeing this as atomic size and metallic trend

[uncut crescent]

ye

[thorny gyro]

its actually bc of bonding + density

[thorny gyro]

The strength of metallic bonds in alkaline earth metals is higher than alkali metals due to the presence of 2 electrons in its outermost shell as compared to alkali metals, which have only 1 electron in the valence shell. Therefore, alkaline earth metals are harder than alkali metals. shows google

[uncut crescent]

oh

[thorny gyro]

hua clear ya bouncer gya

[uncut crescent]

yes yes

thank you:)

[merry comet]

I wrote that, but why?

I am not that good at it, may I get a explaination too?

[uncut crescent]

nonane wouldn't be the answer because we gotta include double bond in the parent chain.

the parent chain should be the longest one according to the rule but it must have the double bond too

so we'll consider chain with 8 carbon atoms to be the parent chain

[merry comet]

oh yes, I forgot that was an unsaturated chain, and went for complex substituent nomenclature.

[thorny gyro]

my doubt - Why thallium always shows +1 oxidation state? Please explain briefly and in easy to understand lang

[thorny gyro]

i think it stays in both +1 and +3 but +3 is extremely unstable and it wants to achieve +1

because of what we call inert pair effect- thallium has d and f electrons which are extremely poor shielders, and so they hold the electrons in the outermost shell very tightly

[thorny gyro]

ok di i was confused that it always shows +1 but it looks it seldom shows +3 also.

[thorny gyro]

ok ok thnks di

[thorny gyro]

yeah it preferes to stay in +1

there should be a line in ncert," stability of +1 increases down the group"

so

[thorny gyro]

it just says in thallium +1 oxi state is predominant whereas the +3 oxidation state is highly oxidising in character. the compunds in +1 oxi state, as expected from energy considerations, are more ionic than those in +3 oxi state.

[thorny gyro]

but i got it that this ^ is the main reason

[thorny gyro]

exactly

[thorny gyro]

hehe thankss

[proven atlas]

can someone help me with this problem? I don't know how to find the time it takes for the ball to hit the ground

Here’s what I got for (a)

[tender mesa]

could someone help me with this?

[urban jolt]

You look at the movement along the x and y axis seperately. First you calculate how long the ball will take to drop from said height. Assuming there isn't any air resistance or any of that yada yada stuff, you can calculate how far the ball can go along the x axis

[proven atlas]

what formula do i use?

i got the formula sheet if you need it

[urban jolt]

um it should be 1/2gt^2

for the y axis

[proven atlas]

ok lemme try that

[urban jolt]

s=1/2gt^2, calculate the time with that formula

after that you can calculate the movement along the x axis with v=s/t

[proven atlas]

what is s in this context?

[urban jolt]

height/distance

[urban jolt]

did you manage to do it?

[proven atlas]

i searched it up and i think you meant s is height

lemme take a pciture

[urban jolt]

yeah idk what variables you use

[urban jolt]

we use s over here

ye

[proven atlas]

Hell yeah!

Question

so the height is 1.5

[urban jolt]

si

[proven atlas]

but the ball is going downward, does that make the 1.5 negative or should i leave it as positive

[urban jolt]

leave it positive

consider the ground as height=0

[proven atlas]

then that's gonna make 1.5/-5 negative

and i'll have to square root' that

[urban jolt]

oh and use 10 instead of -10, the direction its falling to is irrelevant

[proven atlas]

oh ok

now im trying to use that to find the horizontal distance

ill update you on that

[urban jolt]

kk

gl

[proven atlas]

tyty

[urban jolt]

Have you already done task a?

its only sketching

[tender mesa]

ya

[urban jolt]

kk

[tender mesa]

lmao i figured it out j to get stuck on the next question

[urban jolt]

so you've got 25N pulling up right

and you've got 20N pulling down

which basically is -20N

resulting in 5N if that makes sense

which means the box is pulled upwards with 5N worth of work

does that make sense?

[tender mesa]

ya

[urban jolt]

wait i think i misread something lemme check again

[tender mesa]

could you help me with another question?

[urban jolt]

sure

[urban jolt]

So you've got 2 blocks with different masses

a heavier block which is being raised by only 2m

while the lighter block has to travel longer

try to sketch it out first

[tender mesa]

Like this?

[urban jolt]

ye

[tender mesa]

aight cool

[urban jolt]

you can basically just calculate the mass x height and see what number's higher

don't know the english terms for certain things so I can't explain in detail

[tender mesa]

could you write it out?

[urban jolt]

like

the calculations

or what

[tender mesa]

ya

[urban jolt]

15*4

and

20*2

[tender mesa]

ok thank you so much

[proven atlas]

alright

sorry for bothering you so much but i used xf = xi + vi*t

and got 5.47 m which is kinda weird because i would assume that it would go the same distance as vert since it's traveling with the same velocity

[urban jolt]

you can just use v=s/t

you have the velocity v and the time t

[urban jolt]

oh and dw about bothering me

[proven atlas]

lol got the same answer

[urban jolt]

uh lemme try and do it

[proven atlas]

thank you

[urban jolt]

how much did you get for the time

[proven atlas]

.547

or sqrt(.3)

[urban jolt]

um

can you send me your calculations

[proven atlas]

for sure

[urban jolt]

yeah calculations are correct, i got the same

[proven atlas]

so 5.47 m horizontally

[urban jolt]

so the difference between falling and moving forwards is

while falling, it accelerates right

[proven atlas]

ohhhh

[urban jolt]

and while moving forward

[proven atlas]

shitt youre right!

[urban jolt]

the velocity is constant

[proven atlas]

HUGEE

THANK YOU SO MUCH MAN

❤️

[urban jolt]

np

[thorny gyro]

Why is the the vapour pressure of water vapour in the air constant at constant temp.

[muted stump]

At constant temp equilibrium constant doesn’t change so Vapor pressure is also constant

[thorny gyro]

Ok ty @muted stump

[thorny gyro]

I didn't find main chain, can someone help me please, thank you

[cunning crescent]

Oh thats interesting, I wanna know too😂 tag me too please

[ember stag]

@thorny gyro @cunning crescent this was a long time ago for me and i don't study chemistry specifically but is not just the longest chain of carbons you can find? making it this?

[thorny gyro]

Ahhh yeaaa exactly

Thaaanks a lot <3

[cunning crescent]

Oooh I didn't see it was a CH2, I thought it formed a square in the middle

[ocean cedar]

hii, does anyone get what this means?

im confused as to what the drink actually contains

like are the gin and tonic mixed? do people do that? i know nothing ab alcohol 😭

wording messing me upp

oh wait tonic isnt alcoholic

nvm i think i got it

[stone field]

Class 10th ncert ?

[dusky glacier]

seems to be it

[modest oracle]

Yeah the gin and tonic are mixed, and tonic is non-alcoholic

The answer would have been the same if the gin had been diluted in water

[fallow elk]

Guyyyys,
Can anyone help me with this problem ??

[rich jacinth]

Can someone help me with this, I can only figure out 3, 6 is the correct answer

got it 🙂

[void blade]

can anybody help me name any geological formations in this satellite image? I have no clud

*no clue what is going on here

[drifting pollen]

Hello everyone! Could anybody answer my question? "Why is parenchyma tissue consists of the SIMPLEST cells? "

I mean I know it consist of simple cells like collenchyma and sclerenchyma but why it is the simplest among all?

[rocky elk]

Hello! Can someone help me in Gas Laws I am struggling to understand on how to compute it.

[tawdry crescent]

sure what exactly?

[thorny gyro]

Can you elaborate, exactly about which law or which topic specifically?

[night mortar]

how do i do this?

[storm bay]

hey everyone

can anyone give me ideas for physics projects

its marked school project and i'm running out of creative idea

[modest oracle]

The two resistors at the right are in parallel

And the equivalent resistor is in series by the last 30-ohm one

You got tricked by the global shape, pay more attention to it next time 😉

[night mortar]

u mean 90 and 30 are in parallel?

[modest oracle]

No

30 and 30

The two at the right

[night mortar]

ohkk

but then after finding their equi resistance, in which direction the current flow?

[merry comet]

is option d the answer?

[night mortar]

dont hv the ak

[merry comet]

oh

in the photo, there is no darkened spot on the junction between two 30 R's , I doubt there is any potential difference between them, due to this difference in symol

[modest oracle]

Oh wow

Ok I'll make it clearer

Give me 5 min

[merry comet]

but that means the answer will be 45, as three 30 R's will be in series along with 15R , and 90 R will be parallel to them. then 30+30+30+15=105

1/105+1/90 =1/R

[modest oracle]

What

[merry comet]

so, R eq.=45 ohm

[modest oracle]

They're not all in series

Why do you sum them all ?

[merry comet]

.

[modest oracle]

Dark spot or not

They're clearly connected

That's just a mistake from the teacher

[severe sapphire]

how can I find the components of the angular momentum for this?

[modest oracle]

And even if it was a trick question, there would only have be two 30-ohm resistors in the series, since the last one (the middle one) wouldn't have been connected

[merry comet]

I am not sure what has been taught to everyone, but the bold dots in a circuit represent nodes

and nodes are the point that has same potential difference

here is a source to prove my words

[modest oracle]

They do

[merry comet]

see if it isn't a node, then the wire must have overlapped each other in real situation, in that case, if you untangle them, they will be nothing but a part of the main wire

[modest oracle]

...

[merry comet]

lol

[modest oracle]

I think you're overthinking

I'm almost sure the teacher didn't intend to make a trick question, and just forgot to add dark spots (UNLESS @night mortar is currently taught the conventions used in electricity, then it would be relevant (but dumb to me))

[merry comet]

idk, I have personally faced such questions in competitive exams, so I tend to see the small details. but I can't say any of us are right or wrong, it is a possibility.

[modest oracle]

That's how I think it is meant to be solved

[modest oracle]

Like yeah your reasoning is relevant is they're currently taught about conventions and all

But that'd just be dumb to me

[merry comet]

but the answer in this case comes 46.1 and something, which isn't in the options

so I assumed this

[modest oracle]

My answer is : (((30 // 30) + 30) // 90) + 15 = 45

(I wrote 150 instead of 15 on Paint)

I'm surprised you managed to get 46.1

[merry comet]

so we have same answers, peace.

[modest oracle]

Your option (ignoring the 30 resistor in the middle) suggests : ((30 + 30) // 90) + 15 = 51

[modest oracle]

You said you had 46.1

And 45 is in an option

[merry comet]

I can't understand the symbols? can you write it in paint as you drew the diagram?

[merry comet]

@modest oracle

said this before

[merry comet]

and this lol

[modest oracle]

That reasoning was false

[merry comet]

idk, I doubt your calculations, according my reasoning, the answer was correct.

[modest oracle]

Alright

Please

Draw me ever step you made on paper

[merry comet]

can I get this one?

[modest oracle]

Then send it here

I'll do the same

[merry comet]

ok I will after you prove your calc

[modest oracle]

a + b is the regular addition (series)
a // b is the short notation for 1/(1/a + 1/b) (parallel)

[merry comet]

oh yes fine, your calculations are correct, but so are mine, despite trying different methods. idk why so...

[merry comet]

the direction will depend on the way we attach the cell.

[modest oracle]

Show your workings to me please

Here are mine

[viral sorrel]

ok so, just to point out, not all nodes have to be represented by bold dots, the dots might just be there to highlight a point you want to know the potential difference, like in the picture, the point D doesn't represent anything in particular, it's just a useful point

that kind of reasoning doesn't make much sense, not all connections between wires have to be highlited

[viral sorrel]

btw this is absolutely correct, i don't see many other ways you could have resolved this

[modest oracle]

THANK YOU

I was losing my mind over this

[viral sorrel]

this is the most relevant thing, anything after this is very simple

[modest oracle]

I hate dealing with stubbornness so much

[merry comet]

I rechecked again, my calc, were wrong somewhere but I managed to get 45, idk how, but yes, you are correct. I apologize to create the ruckus.

[modest oracle]

No worries man, I was really struggling to find how you got the 45

[stiff marsh]

Guys, does anyone studying Electrical Engineering. I need to solve this question but I need some explanations. The topic of this problem is three-phase transformers.

[night mortar]

Got it thx!

[vital sable]

Anyone know what is the functional group and positional isomer for this compound?

[glad pulsar]

Carboxylic acid is correct

[thorny gyro]

this is chain isomer not position or functional group isomer@glad pulsar

[glad pulsar]

I c

[thorny gyro]

functional grp isomer -make an ester

[thorny gyro]

position isomer-change the position of double bonds

[thorny gyro]

numbering will always start from -cooh

[glad pulsar]

For position - keep the functional group Same

For function--change the functional group aka make ester

Ace is correct

Noice

[uneven sequoia]

uh- sorry
didn't notice

[ruby sequoia]

thank you for your help

[ruby sequoia]

thank you for your help

[thorny gyro]

<@&717391911132069929>

Fuck this message up

Ty peeps

[thorny gyro]

Can someone help me?

[balmy nexus]

what exactly do you need help with?

[thorny gyro]

i dont know how can call it

[balmy nexus]

Oh. Think there are a few rules about this. Firstly, you have to identify the longest chain of Carbon atoms. Have you done that?

[cunning crescent]

It will help you if you draw the structure

[thorny gyro]

ı tried but i couldnt

[thorny gyro]

2 methyl pentane

[thorny gyro]

thank you, can you send the structure?

[thorny gyro]

just google 2methyl pentane and you will get it

[coarse stream]

Can someone help?

[thorny gyro]

Okay thanks again

[karmic barn]

For chemistry for caluclating volume is it mass final- mass initial divided by density

[tawny bane]

In the article, there is a shape of biomass co-fire power plant and critical points and devices(like condenser,pump) are shown. And below the shape, there is a chart of presssure and temperature values of some stages. All i need is basic energy and exergy analyses of this powerplant with values of enthalpy, entropy, and work output, efficiency etc. You dont need to do very proper job, i just need to show my teacher that i managed to do something

can someone help

[balmy nexus]

Hey. What specifically are you having trouble with?

[coarse stream]

I solved it, thank you.

[warm jewel]

I was wondering, in the case of a person standing in an elevator, and the elevator cable is cut off (so the person is in free fall). Would the inertial acceleration vector go towards the top or the bottom?

[viral sorrel]

neither, it would be 0, you and the elevator are moving together

[warm jewel]

wouldn't it be -mg = ma so a = -g ?

how come it would be 0 ?

[viral sorrel]

Well you are not moving in respect to the elevator

[balmy nexus]

Since the frame of reference itself is moving. You need to apply a pseudo-force to use Newton's second law.

-mg (weight) +mg (force due to elevator's acceleration) = ma

[warm jewel]

Thank you for your answer! I've thought about it for a while and I think I understand now, we need ma = 0 since we are free falling, and since the frame of reference is moving we have an additional pseudo-force. I think I falsely assumed that in a Non-inertial reference frame, ma didn't have to equal 0. So I think I got it now, thanks again!

[winged plover]

@analog wind

help me

[analog wind]

what do you need help with?

[winged plover]

treaty of waitangi 🥺

[analog wind]

that's more of a general type of course, for that information go to general help chat

[fierce spade]

Hi

Could you help me with chemical elace? :C

[fair mason]

Can someone answer this?

[balmy nexus]

Hey. Cv is fR/2. So, we only need to calculate f (degrees of freedom). For helium/argon, since they're monoatomic there's only 3 degrees of freedom (Translation motion in X, Y, Z directions). For Oxygen, since it's diatomic there are 5 degrees of freedom (Translation along X, Y, Z + Rotation around 2 axes).

Once you know Cv, Use Cp - Cv = R to find Cp. R is a constant so should be the same for all gases.

[surreal shore]

how do I name this compound?

[thorny gyro]

para dibromo benzene?