science-help

[thorny gyro]

need confirmation if im correct

what do you all get

[restive valve]

You also need the Earth's mass. I get A.

[dim robin]

Hey guys! Who have to study and need a little bit of company- courage? Come and study with us! I have made a study motivation group ☀️🌻 u could just add me or answer to my message. Gm from Greece!

[thorny gyro]

Q29

[restive valve]

Supposing the normal reaction force by the wall is constant in magnitude as well as the gravity force, and since these two forces are always perpendicular to each other, it should be A.

[placid lark]

A 39.22 kg mass has an initial velocity of 13.05 m/s (right). A force of 563.2 N (right) acts on the mass over a displacement of 6.722 m (right). Ignoring air friction, what is the final kinetic energy of the object?

no clue on how to do this

*circular motion

[thorny gyro]

idk why I'm getting 2.5 as the answer

[restive valve]

find the magnitude of the slope at t=4

[thorny gyro]

I did. it's 10/4 = 2.5

However, in the SAT answer book, it says the answer is 10

someone sent me the solution but I'm still lost. Lemme share it here

[restive valve]

Yes, this is correct. What is it you don't understand?

[thorny gyro]

isn't slope supposed to be simply y value/x value?

[restive valve]

no, it's the derivative of the curve, so dy/dx

for straight lines, it's change in y over change in x

[thorny gyro]

I think I'm getting it

lemme think it over

tysm for the help

[restive valve]

np

[thorny gyro]

ok sorry for bothering again, but like, shouldn't it be 20-0/5-3?

why is 0 taken as the final value for velocity?

[restive valve]

it doesn't really matter in the end, since you want the magnitude. But velocity is 20 at t=3 and 0 at t=5, so initial velocity is 20 and final is 0.

[thorny gyro]

AHHHHH I FINALLY GOT IT! TYSM YOU ANGEL!!!!!

[restive valve]

you're welcome :)

[restive valve]

for motion in a straight line, this is easy, but for circular motion i'm not sure how to solve it.

[thorny gyro]

is this object falling?

if so simply add both the kinetic energy on the 2 axies

[thorny gyro]

it cant be moving in a circular orbit, the best guess is that it both moves horizontally and fall vertically (and the *circular motion qsr said was a mistake)

[restive valve]

yeah, not sure how to interpret the circular motion part

[placid lark]

its fine, i got another

[merry haven]

why is Cr+1 rare?shouldnt it be more stable since it has 3d half filled

[untold token]

k

[crude chasm]

the reason why half filled orbitals are more stable is called exchange energy. it is one of many minor factors that explains variations in energy. it is more likely that the ionization energy is very high / affinity for other reactions is very low

[uneven osprey]

which tissue prevents the wound from infection?

[thorny gyro]

what mean my estrogran-primed

that happens is secretory phas/ post ovulatory phase

[fading mango]

Proud of my recently made physics formula sheets and wanted to share

[crude chasm]

mad respect bro

[thorny gyro]

do these have derivations?

[sinful mirage]

Biology class 12th evolution chapter

Is industrial melanism example for natural selection or anthropogenic action or for both?????

@tacit notch

U have neet in ur username so sry for the ping but can u answer the above question

[fading mango]

Nah, just formulas and basic diagrams for context. I wrote them down to revise. The derivations are in my classnotes

[tacit notch]

both i guess

[sinful mirage]

Was thinking the same

Ty

[sinful mirage]

`The genotypes AA, Aa, aa have frequencies 0.5, 0.25 and 0.25, respectively. What will bethe frequency of A and a?

[sinful mirage]

Anyone?

[thorny gyro]

The question is wrong

[sinful mirage]

Ty

[thorny gyro]

No it is

[sinful mirage]

Yes

Thanks for confirming

I also thought so

[thorny gyro]

Aa- should be 0.5
Then the question will be alright

And AA-0.25 and aa-0.25

Then a and A would be 0.5
And that would be the answer

[sinful mirage]

🙇🙇

[thorny gyro]

anyone pls recommend a website from which i can study 11th and 12th grade biology

[thorny gyro]

YouTube.com

[eternal stream]

Khan Academy

[left light]

Textbooks if you are able to buy them, so that you can follow the curriculum

[thorny gyro]

Are there no questions anymore?

[thorny gyro]

k lemme fix that real quick

2 identical masses A and B connected via a string (doesn't extend and assume always taut in this problem) length l. A is always on the horizontal, frictionless surface while B dangles below. Initially, A is moving in circular orbit with velocity V_0=sqrt(gl/2) and B is perfectly stationary, the distance between A and the hole equals the distance between B and the hole (=l/2). Very quickly displace B by a small amount and then let go, prove that B oscillate harmonically and find its period

[thorny gyro]

Hi does anybody have chem 1 st chapter notes 11th grade india

[fading mango]

@thorny gyro this is the tension in equilibrium. If we displace B by a small distance x we can say:

[fading mango]

which means

[fading mango]

can we say this is equivalent to the force in an oscillating body in the form F=-kx?

[thorny gyro]

Hm i don’t think so for a few reasons: 1) the restoring force is supposed to be proportional to displacement in the x^1 fashion, while this tension force you got is x^-1 fashion (great difference if you put them in desmos) 2) the force vector should be opposite in direction to the direction of the displacement vector, while tension only points in the upward direction (you need to prove that when added with P (B’s weight) then it satisfies the above “criteria”)

[fading mango]

Ooh, I see where I went wrong. I only calculated the tension, but the total restorative force on B is:

[fading mango]

And if B is displaced upwards we get r=(l+2x)/2 so:

[fading mango]

So that resolves both the issues with my initial answer

Now F is proportional to x

And it is opposite to the direction of displacement, whether it is displaced up or down

However, I still don't know if the 2x in the denominator changes anything

it feels like it should be separated from the denominator entirely

[thorny gyro]

Yeah it does, x in the denominator messes it up quite badly

[fading mango]

so how do we fix it? where am I going wrong?

[thorny gyro]

Can you show me all of your reasoning? Like how you came up with the expressions of the forces and etc

[thorny gyro]

Idk why in here tension is taking 2 different expressions

In class we tackled this problem by finding the differential equation that leads to harmonic oscillation x’’+omega^2.x=0

[fading mango]

and you use the same logic to get the restorative force when B is displaced upwards

[fading mango]

yes but to do that you need to first need to get it in that form

F=-kx is basically the same as that

mx''=-kx

x''+kx/m=0

and omega^2=k/m

so x''+omega^2x=0

[fading mango]

technically, you could use only that expression. I have just given two expressions for when B is displaced up as well as down

but the effect is the same, the force is always opposite to the direction of displacement

[thorny gyro]

so, when you write T=mv^2/r, you're assuming the net acceleration on A is 0, this is incorrect since A and B accelerates together (bounded by the string), and you're assuming A's velocity remains constant when r changes, which is incorrect because the angular momentum of A is conserved, so as the radius from the hole to A decreases a little bit, A's velocity increases a little bit

[fading mango]

hmmm true true

[fading mango]

man that feels like too many variables to deal with....

[thorny gyro]

yeah i really hoped that there is a way to solve it intuitively by force analysis like this

[sinful mirage]

What is the difference between the following??

[celest gorge]

mu_0 = permeability of free space
mu = permeability of a particular medium
mu_r = relative permeability = mu / mu_0

[sinful mirage]

Thank you so much

Is this true??????? This formula changes when medium changes

[thorny gyro]

Thank you

[celest gorge]

yes in this form, but there is other form which is valid in each case ,
n2/n1= d/d' , where n1, n2 are refractive index of two mediums, d is real depth, d' is apparent depth and light travels from medium 2 (n2) to medium 1 (n1) .

[sinful mirage]

Thanks!

[narrow axle]

Does anyone know how to do this question?

The numbers in the brackets are the answers

[candid elbow]

@narrow axle

sorry for the shitty handwriting

[narrow axle]

Ohhh i see thank youu!!

[candid elbow]

yw!

[thorny gyro]

whos studying physics 102?

cover of the book

[restive valve]

I studied this for a course quite a while back

[thorny gyro]

is it ok if i asked u about any point i dont get it?

[restive valve]

of course. What chapters are you studying?

[thorny gyro]

from 23 to 30

[restive valve]

cool, so electricity and magnetism, right?

[thorny gyro]

yeah

[thorny gyro]

can anyone help with this? the answer is at the bottom

[stoic sequoia]

Can anyone explain the de broglie hypothesis in short I'm having a hard time understanding it 😅🥺

[lavish obsidian]

Since particle has dual nature he equated two equations by Planck's quantam theory and Einstein's energy mass relation which looked smth like this

I can't think of anything simpler than this so hopefully this helps

[lavish obsidian]

I solved it for some reason the solution is not coming through

[lavish obsidian]

I mean I sent it here but I think my discord is not working

A little confusion in empirical part but I think u should be able to understand it

[thorny gyro]

thank you so much!! I appreciate this 🥰

[lavish obsidian]

My pleasure

[thorny gyro]

Hi! So there is a rule that in mesomeric effect, if the atom/group that is withdrawing/donating is carbon then it is NOT known as mesomeric effect. However, in this I see carbon as the atom that is withdrawing electron from the ring so this should not be known as mesomeric effect right?

[thorny gyro]

never heard of this rule

if there was an alkyl group then there would have been a possibility of hyperconjugation
and yes not mesomeric

but there is no such said rule

[thorny gyro]

Oh okay understood! Thank you so much!

[white wasp]

why isn't m_l=-1 also possible?

[thorny gyro]

Why doesn't CN have +/- I effect on this? & also show the hybrid structure of benzonitrile

[astral laurel]

Does anyone knows wht is OFG here

[astral laurel]

If anyone knows pls mention/tag me

[thorny gyro]

can anyone help me with these my teacher ain't teach me nothing in class 😔✌️

[lavish obsidian]

Gotch ya

[wraith stone]

there is no such rule

[wraith stone]

-m effect will dominate here

over inductive

[thorny gyro]

Yes, that's understood. However they said that Inductive will not exist. I feel that Inductive would exist but just not be the deciding factor

[wraith stone]

yep

[thorny gyro]

Okay cool! Thank you!

[wraith stone]

always check resonance > hyperconjucation > inductive

[thorny gyro]

Okayy! Can you also show all of its resonating structures?

And any tricks/tips to know the number of resonating structures of a compound without actually doing the whole process?

[wraith stone]

i don't think there is a trick for that but benzene always makes 5 resonating structures

[thorny gyro]

Ohhh okayy understood! Thank you so much for all the help! @wraith stone

[stoic sequoia]

Guys im having a lot of problems in vector concepts like vector law of addtion triangular law of addition and orthogonal vectors considering the fact that its the base for all physics chapters...pls suggest me some good advice...😅 😅

[lavish obsidian]

If you go to any coaching classes then you should ask your teacher personally to help you with it if you can do that otherwise study your own notes thoroughly then solve some basic problems even if it takes you long time to do that and if you don't have either of them then I'd recommend going to youtube and take some video lectures on vectors of 11th there are many channels like physics galaxy and Mohit Tyagi PW etc. Watch their videos and make notes with it then you should be able to understand them for the most part

[restive quest]

hello!!

is it possible this reaction? Fe3+ + SCN- -> Fe(SCN)3

i google it but the product seems to be Fe(SCN)2+ and i don’t understand why…
it’s about the purification of CuSO4 industrial

if i do Fe(OH)3 + 3HCl it ends up as FeCl3 + 3H2O or as (Fe(H2O)6)3+ + 3Cl- …. or like Fe3+ + 3Cl- + 3H2O??? 😔

[thorny gyro]

Rgb

Hmm lol i think i am confused too now

[restive valve]

For light, the primary colors are red, green, blue

[thorny gyro]

I think blue and yellow makes green

Yh ig

[restive valve]

Those are for pigments, or paint, not light

[thorny gyro]

Hmm interesting

[ripe bramble]

@thorny gyro if you want answers you can dm me

I'll give proper solution

[thorny gyro]

i want answers too

[copper forge]

can anyone please tell me why the bottom left one has a vertical reaction force but the others dont? Thanks in advance

[restive valve]

From what I found, it is possible, but Fe(SCN)2+ will be the most abundant of the products. There will be a very small amount of Fe(SCN)3 depending on how much SCN- there is in the reactants.

[thorny gyro]

These three please

[wraith stone]

what's wrong water acts as a polar solvent so fecl3 divided into ions.

similarly like we can write HCL into h+ cL-

[restive quest]

thank you !! i had lab today and it was a requirement to go there with that reaction (? but at the end it was the complex kind of formula

the one that goes like (Fe(H2O)6)3+ …. IT WAS IMPOSSIBLE TO KNOW IT BY MYSELF 😔

[restive quest]

makes sense!! thank you i had no idea

[wraith stone]

this one is nice do u know Bronsted-Lowry definition of an acid.

or Lewis theory

here fe3 + acting as lews acid

due to electron defecency

and try to withdraw loan pair of oxygen

[lone juniper]

Can somebody explain this statement with an example m having trouble visualising

[warm timber]

Well it refers to the fact that rate of change of velocity with time (acceleration) is constant for objects in free fall. Here 'free fall' refers to the phenomenon in which objects fall due to earth's gravitational pull.
The part after that is saying change in velocity with distance is not constant and it decrease as the height from which the object is falling increases. Here you don't have to visualise anything as this were the observations from an experiment.

We can also derive the second observation from the first one.
As dv/dt = acceleration which is constant
Notice this now
(dv/dl)×(dl/dt) = constant
(dv/dl) = constant/ velocity
Where dl/dt = velocity
As velocity increases the value of dv/dl must decrease as well

[thorny gyro]

can someone pls help me

[thorny gyro]

Sup

[thorny gyro]

@thorny gyro

[thorny gyro]

Okay
5-10 min

@thorny gyro

tysm!!!!

Hi, can someone please help with this along with the explanation?
Q: To find the COM of the remaining disc.

[thorny gyro]

since the shape is too ugly to integrate we'll use the superposition principle

if m'=m-∆m, choose the origin at the center of the big circle and the positive direction to the right, then ∆m.R/2-m'.x=0

x= ∆ m.R/2(m- ∆ m)

oh wait i guess we still can integrate, just let the missing part as negative

[thorny gyro]

Would it be possible for you to solve it on a piece of paper to show steps? @thorny gyro

[thorny gyro]

thats all the steps, this is the final expression for x you just need to substitute R m and ∆m in here

I am still finding it difficult to understand, probably because may have not understood the question properly

@thorny gyro

the question ask to find the center of mass of that crescent looking shape, but if we simply use the formula \int\frac{r.dm}{m} it'd be (maybe) impossible. so we instead use the principle of superposition, which states (in this case) that ∆m.x_∆m+m'.x_m'=m.x_m

if we chose the origin at the left most point of the circle, then
x_∆m=3R/2
x_m'=x (unknown that was asked to look for)
x_m=R

but if we chose the origin right at the "original" circle, then x_m=0 and
x_∆m=R/2 and x_m'=-x

[thorny gyro]

i chose the latter one and end up with this

[vernal kelp]

Hello everyone, my name is mina i’m from Indonesia, i want to ask you guys something, what is your country do to reducing food waste?? I’m very interested to solve this problem, i’m very thankful if you answer it, or maybe you can explain it in personal chat with me, thank youu🙏

[ripe bramble]

Hlo mam. I am from India.We have our rituals. We worship trees, first harvest in every season. We are always tought that food is a gift from our mother earth and farmers put their efforts to grow it. If food is left we are tought to give it to street animals in order not to waste food. We are also tought to make atleast one roti for cows, street animals.

[thorny gyro]

what if the animals dont eat it, and making one roti for a cow is one roti wasted that could have gone to a person no?

not trying to create controversy just trying to understand

[hardy sigil]

Wow boy genius 👏👏👏

[hardy sigil]

Send help pfft but that's chemistry huhuhu

[lavish obsidian]

You are alive? 😐

[hardy sigil]

Ofc :( huhuhu

Waaaaah 😭

Help meeeeeh

Jk

Hryah

[lavish obsidian]

We are not supposed to talk here

[hardy sigil]

Kdot

[thorny gyro]

Oh okay understood! Thank you so much!

[fathom pebble]

can someone help:

To dissolve 16g of LxOy (Ar L = 56), 300 mL of HCl with 2M molarity is needed. Find the formula of LxOy!

[eternal marlin]

Can any1 tell me betw A and B which is more electronegative

[thorny gyro]

OH- to A

A would be forming a carbocation

[eternal marlin]

Yes that would be my ans but the soln was that oh was to b so i got confused

[thorny gyro]

What's the solvent?

[eternal marlin]

H2O?

This was an oxidation reaction

[thorny gyro]

Is anything mentioned about like ' a drop of h2so4' or something like that?

[eternal marlin]

nono

[thorny gyro]

Hmm

[eternal marlin]

Just a simple oxid react

[thorny gyro]

So according to the ans the product is a primary alcohol?

[eternal marlin]

Anti markoniov

[thorny gyro]

Hydroboration oxidation ig

But b2h6 needs to be there

[eternal marlin]

Yess

Wait

[thorny gyro]

Normally if it's not mentioned we assume acidulated water and in that case rearrangement occurs and a secondary alcohol is formed

[eternal marlin]

This was a conversion with the help of hbo reaction

[thorny gyro]

Yep ik

That's why I asked for the solvent

[eternal marlin]

I c

[thorny gyro]

Well i am partially in the wrong as i should have asked for the medium

[eternal marlin]

Idk i am new to this Concept

[thorny gyro]

In the hbo rxn we follow antimarkownikoff rule without rearrangement

[eternal marlin]

Yes

[thorny gyro]

So you can simply place oh to the least substituted carbon

In this case 1 deg carbon

[eternal marlin]

So b?

[thorny gyro]

Yessir

[eternal marlin]

Ok thnx but if rearrg done then a can also be an anw

Wait i got confused with b

Anyways thnx

[thorny gyro]

No no to attach to a ,u have to use a different reagent

[eternal marlin]

Sodeska

[thorny gyro]

Oximercuration demercuration rxn

[eternal marlin]

ok i will get to that rxn later

[thorny gyro]

Rearrangement occurs in presence of h2so4' and a completely different product is formed

Where oh could be attach to a 'c ' carbon for that matter 😉

[eternal marlin]

Hmm i get it

[ripe bramble]

Mam there are 2 or 3 cowsheds in each area in our country .If in one of them cows don't eat them we give it to other street animals or go to another cow shed. Also some cowshed owners take them and feed the roti to the cow later.

[thorny gyro]

But why are you feeding stray animals? Doesn't that further expand the spread of disease and increase population of stray animals?

[ripe bramble]

Mam we always consider them as our family. As we feed them they also feel connected to us and protect our society.In order to solve the problem of increase in population and danger of spreading of disease by stray animals the veterinary sends their workers at least twice in 3 months. Also our daily diet contains many types of spices which in return gives us immunity.

[echo plover]

hey!

Can anyone help me with this!?

[ripe bramble]

Write the values of a , b by using formulas of range and maximum height. Then divide both the equation and find tan theta . After that find sin theta by drawing a right angled triangle by using tan theta as perpendicular/base.after that put value of sin theta in value of b(you found before) . And solve re arrange it and find velocity

[thorny gyro]

Idk, ayurvedic remedies are not the most reliable, and diseases such as rabies dont really have a remedy so...

[thorny gyro]

guys any good tools for revising chemistry concepts

ive already heard about anki

are there any other programs perhaps

[thorny gyro]

can anyone help with these?

[ripe bramble]

@thorny gyro you just have to balance them by oxidation reduction meathod. If you don't know I will provide the way

[ripe bramble]

Mam in our locality dogs get habitual and just bark at the stranger if he is just walking on the roads

[deft summit]

Do nonpolar substances/dielectrics have zero internal electic field when under external external electric field?
OR
its the total electric field zero ?as internal set up electric field cancels applied electric field/external electric field

Anyone?

[thorny gyro]

When put under an external E field the atoms in a dielectric will polarize

The field created by the polarized atoms have opposite direction with the initial field, so the field within the dielectric will be \vecE=\vecE_0+\vecE’

[thorny gyro]

Organic chemistry tutor YouTube channel

[thorny gyro]

But they can bite, they produce waste which in turn is left on the road which will spread disease

[deft summit]

So total will be zero?

[sullen plume]

does anyone know how the structure of insulin relates to its function?

[deft summit]

How come the potential for charge Q also same as on charge at B?

[crisp ether]

Can anyone tell me if basicity of an acid is releted to its acidic character, if yes then how??

[ripe bramble]

Mam. Cleaners clean the street thrice a weak.

[ripe bramble]

@crisp ether basicity is the concept used to determine the strength of an acid, but it is not always true that more basicity means more acidic character because acidic character depends how much easier the release of proton more will be the acidic character which can be explained on the basis of Ka value , stability of conjugate base , differentiating effect of solvent etc. In case HI is stronger acid than H2SO4 but H2SO4 has basicity two but HI has one actually first removal of proton from Sulfuric acid is easy but second proton removal becomes difficult from HSO4- ion , basicity is the no of replaceable hydrogen atom I.e the significance of acidic character as per Arrehenius concept more will be the no of replacable hydrogen I.e more will be the acidityand more will be the acidic character, for example in acetic acid there is one replacable hydrogen and it is monobasic acid and in phosphorus acid there is three hydrogen atom but only two hydrogen atoms are replacable which is attached to oxygen and hydrogen atom attached to phosphorus directly is not replacable and it is dibasic acid and it is practically true from Lewis structure of it.

[crisp ether]

Thank you

[harsh quest]

Hello everyone, I am going into advanced Chemistry next year and I was wondering what study techniques you people used that have helped you achieve a great score. Apologies if this is the wrong chat.

[hardy sigil]

Anyone who can help me with rectilinear motion and curvilinear motion?

[hardy sigil]

Am I doing it right or nah? Uhh sarreh I'm not good at physics lmao

[restive valve]

I think what you wrote as 3-4 is actually the 2-3 part of the line and there is no 3-4.

So the average speed is what you wrote in the end but without the s_2-3 and t_2-3

[hardy sigil]

Ohh if the car ran out of gas, what will be it's velocity?

[restive valve]

Well, you are not given any information about what happens between when the car runs out of gas and when the man starts walking. So the simplest thing is to assume that the car stops instantly and the man starts walking immediately after that. It's not realistic but it doesn't give you more information.

[long parrot]

Hi guys, I'm willing to give you a seminar session about neutral evolution, about what I've just studied, 40 minutes later. If you wanna come, pls react with an emoji! I will be happy to see y'all!

[hardy sigil]

So I'll just remove the s_2-3 and t_2-3? Uhmm I did that as well but I didn't get the correct answer

[toxic lichen]

Hey someone help me with the 15th one

[toxic lichen]

average speed would be distance by time

total distance 75+90+180

=345m

time is 30s

avg speed would me 345/30

=11.5

m/s

[toxic lichen]

@restive valve

[restive valve]

it's (2)

[toxic lichen]

it's 3

and btw how did u do it ?

[restive valve]

isn't the weight force of the ball mg=50 kg * 10 m/s/s = 500N ?

[toxic lichen]

N of B is correct

N of a is 100/ root 3 N

[restive valve]

if N_A was 100/sqrt(3), its vertical component wouldn't be enough to cancel out the weight of the ball

[toxic lichen]

idk my book says the answer is c

hey can u show me the sol.

like how'd u do it

[restive valve]

the rest is trigonometry

[toxic lichen]

thanks

[sterile flare]

I have a circuits question that seems basic but I cant figure it out

So given the voltage drop and the current across a resistor, and calculating the power, this power calculated, could it be interperted that this is the power entering or leaving the resistor?

Ik that the power is dissipated through out the resistor as heat

Like if 100 W battery powers two resistors in series, and the first one burns 20W, the next resistor will burn 80W

[restive valve]

a resistor is a passive component and as such it only receives energy

[sterile flare]

yes

the hw question was this: "Would the student interpret
their calculated power as power
entering or leaving the resistor?"

[restive valve]

I guess entering

[dim sparrow]

Among Gram +ve and Gram -ve bacteria which one is harmful ?

[thorny gyro]

Both

[dim sparrow]

@thorny gyro thanks bro

[deft summit]

How come the potential for charge Q also same as on charge at B?

[potent bobcat]

Help please how to solve this ??

[thorny gyro]

assuming that is i_0 then you have

[thorny gyro]

💀

the last 2 \frac is subtracting eachother

i forgot

[potent bobcat]

Here the answer is in sq so if you remove it by root you should get Io/root3

The formula should be

[thorny gyro]

that formula is the integral divide by t2-t1 difference

[thorny gyro]

i thought the 1/t2-t1 is in the integrand

[sterile flare]

hey i need help with this problem

so what i did to solve each case was make it to where every 1000 hours passed, i added another incandescent lightbulb to the price, plus the price for 1000 hrs of electricity, and compare the prices until the incandescent bulbs became more expensive than the LED

Here are my answers:
Case 1: 8000 hrs, case2: 4000 hrs, case 3: 7000 hrs, case 4: 4000 hrs

Someone tell me if that sounds right, thank you so much

[sterile flare]

Anyone there

[dull zealot]

nvm got it

[hallow pulsar]

yo

anyone here

can anyone derive the eta formula

of efficiency

mechanical advantage = velocity ratio * η

[thorny gyro]

Is this formulae right or wrong?

[grim yarrow]

Might be useful

[kindred rain]

how to solve the gel differ from each.

[frank marsh]

would appreciate any guidance

[thorny gyro]

Rewrite v in terms of a and t, separate v to 1 side then you can graph v-t

Or, notice that a is dv/dt, hence v is just the antiderivative of a

[frank marsh]

Thank you!

[eternal marlin]

When a electron jumps from a higher orbit to a lower orbit...betw radiation and absorption what occurs?

[warm gull]

radiation!

since going down from higher orbit that has higher energy to a lower orbit w lower energy, it has to lose the difference in energy, n it does it w radiation

going from lower orbit to the higher one is w absorption

[thorny gyro]

how to memorize kingdom animalia faster and for long term, any tips?

[swift kite]

Are you talking about how to remember each phylum with examples?

[thorny gyro]

Yes

The boring terms they got

[fierce socket]

oooh i use to do this in hs

use short words for all of it

like

-first two words (last words)

then arrange them all together

then just think of like a short story afterwards based on what the words sound like

[thorny gyro]

Good idea

[thorny gyro]

just read about them enough times

its super easy to remember the names of the phylums but a bit harder to remember the examples properly

so just read it like 10-12 times properly

[dense kettle]

I have a question. Where to learn about science? I am mainly interested in physics and astronomy

Could you recommend any websites

Or other sources

[quartz cradle]

Can anyone help me to solve this .

10 g of metal carbonate upon heating gives 5.6g residue .Calculate
eq-mass of metal Sulphate

[thorny gyro]

YouTube

[wicked forge]

what does it takes to be an aeronautical engineer ?

[dense kettle]

Could you recommend any channels?

[thorny gyro]

For physics specifically?

Is it an interest thing or a score well on an exam thing

[dense kettle]

Mainly focused on physics

[frank marsh]

"Organic Chemistry Tutor" on youtube has a lot of very useful videos for a lot of topics in physics, chemistry, calculus

https://www.youtube.com/c/TheOrganicChemistryTutor

https://www.youtube.com/playlist?list=PL0o_zxa4K1BU6wPPLDsoTj1_wEf0LSNeR

here is a physics playlist

[dense kettle]

Thanks

[buoyant bone]

Hii

What graph would I have to use for this?

[neat cypress]

Hii, i was wondering if anyone knows one example of equimolar counterdiffusion from real life? i was searching online and i only find examples for regular diffusion and im not sure if thats the same thing

[hallow pulsar]

can anyone explain to me the how to use the empirical formula?

in chemistry

[rare dagger]

depends on how you want to use it. In short, the empirical formula gives you a proper ratio of atoms present in a molecule. For example: CH2O is an empirical formula for glucose because, for every carbon atom, there are 2 hydrogen atoms and 1 oxygen atom. When measuring the mass of atoms in a compound, you often solve for empirical formulas first. If I take a compound (like glucose), find the masses of the atoms of C, H, and O, transform the masses into moles, i'll find that the C:H:O ratio will be 1:2:1.

It is important to note that the empirical formula IS NOT NECESSARILY the molecular formula. The molecular formula gives you the exact number of each atom in the molecule. In the case of glucose, the empirical formula is CH2O, but the molecular formula is C6H12O6 (everything is multiplied by 6). This is why in labs, empirical formulas are used as secondary evidence to confirm findings from primary evidence. The reason why this is so is because there are many molecules who's empirical formulas are CH2O. Formaldehyde, glucose, fructose, and ribose all have the same empirical formulas (CH2O) but different molecular formulas (Formaldehyde = CH2O, glucose = fructose = C6H12O6, ribose = C5H10O5).

Overall, you can chemically find the masses of individual atoms in a pure compound and calculate the mole percent of each in the compound to find the empirical formula. That gives you the ratio of each atom in the compound. It should not be confused with the molecular formula nor should it be preferred to the molecular formula in a laboratory setting.

[fringe venture]

this is gonna be a shot in the dark but

gen chem anyone?

[rare dagger]

Classic case of dimensional analysis:

(20.0 mg) x (1mL/0.800mg) x (15.0 gtt/mL) x (1 min/20.0gtt) = 18.75 = 18.8 minutes after rounding significant figures

[fringe venture]

omg I was on the right track

tyvm

[fringe venture]

do u have any advice for gen Chem + beyond

[ornate pine]

@grim matrix

some mod closed it :<

[undone sphinx]

Is anyone familiar with uncertainty in measurements and ISO GUM method?

[grim matrix]

Because it was inactive, no one closed it

[ornate pine]

i can't even chat there anymore

[ornate pine]

the thread is closed

[ornate pine]

try to chat something sir

inside of the thread

[grim matrix]

Am no sir😆

[ornate pine]

ok

so chat something man

[thorny gyro]

Is it necessary that the HIV will always cause AIDS ? If the HIV cannot be removed from the body but it can be controlled using ART sessions, then how can AIDS be completely cured ?

[ornate pine]

there's some treatment to prevent the develop of the virus, to an extent that can be consider freezing it, which means it'll not become worse, hence won't get into AIDS state

[thorny gyro]

can you clarify the difference between AIDS stage and just the presence of the HIV in the body, i mean both stages weaken immunity but how AIDS stage is different ?

[ornate pine]

you're in aids stage when your body are being compromised too much from other disease that are nothing on a normal body.

and your body at this time are too weak to heal up from those disease as well

[thorny gyro]

okay, so we can remove AIDS but not the HIV once it has entered into the body, right ?

[ornate pine]

on the other hand, HIV, your body immune system are weak, but still strong enough to heal up from diseases

[ornate pine]

nope, in AIDS stage you can still use pill to treat disease, but actually can't help much, and a simple flu can actually take your life

[ornate pine]

oh i just remember this, nowadays there's pill that can prevent you from getting HIV in the first 48 hours from exposing to the virus

there's 99% that you wont get HIV if in the first 48 hours you can take this pill

[thorny gyro]

okayy

thanks for the clarification

[potent bobcat]

can someone name this for me please ???!!!!!

[rare dagger]

Everything in chemistry (I repeat, everything in chemistry) can be predicted by looking at charge distributions and energetics.

Energetics determines equilibrium. It determines kinetics. It determines temperature changes, it predicts almost everything. It is also a simple application of charge distributions.

For charge distributions, follow where electrons move. The uneven distribution of electron density in atoms and molecules can be used to predict almost everything, from electrochemistry to organic chemistry (things like nucleophilic attacks), to organometallics, to whatever.

Obviously you have to learn the practicals (lab equipment, how to use them, sig figs in calculations), but from a theory perspective, learn charge distributions in atoms and molecules, and learn energetics.

[fringe venture]

sig figs are a bit of a nuisance atm but they’re necessary so

tyvm for the sage wisdom

[hexed pollen]

Hi everyone, would you please help me solve this physics question?

[rare dagger]

@hexed pollen https://acrobat.adobe.com/link/track?uri=urn:aaid:scds:US:e0297812-27b6-4f50-be86-6be8e246854c

there's the solution and explanation

[hexed pollen]

Awesome, Thanks a lot 🙏🙌

[plain parrot]

Anybody help me solve this Fluid Mechanics que?

[agile aurora]

anyone good at bio? I need help with this -> ||`Describe the steps involved in the process of producing this transgenic organism. (5)

(Provide a detailed step by step method of how the chosen transgenic organism is produced by recombinant DNA technology. Include names of all enzymes involved, name/s of genes and how the foreign is copied and introduced in the transgenic organism).`

[thorny gyro]

why europium is the largest in 4f series??

[thorny gyro]

Genius , Acquired immuno deficiency syndrome is caused due to HUMAN IMMUNODEFICIENCY virus

[thorny gyro]

You are saying as if you had copulation without a condom but don’t expect a embryo

[thorny gyro]

ig you haven't understood my question

[thorny gyro]

i just wanted to confirm that if AIDS can be reverted back but the HIV cannot be removed unless there's a sterilisation cure or eradication.

[thorny gyro]

well, you weren't required to provide a clarification now.

my doubt was cleared

[hexed sparrow]

Learned this in a physics class: Treat objects as point particles.

What does it actually mean?

[restive valve]

That they don't have dimensions (length, width, height) and that they are located at a single point in space at any one time

[outer flicker]

can someone help me witg these coding probs i have due in an hoyur

I am so lost

I will pay someone to help me/ do the probs while explaining

it is in c++

[agile torrent]

Hi everyone, can someone who is good at physics please help me with this question? Determine whether the equation x= vt^2 is dimensionally correct. If not, provide a correct expression, up to an overall constant of proportionality.

The answer in the text book says "Incorrect. The expression x=vt is dimensionally correct." But how did they get to that answer?

[gritty moss]

x is in meters

v is in meters/second

t is in seconds

x = vt makes it so that the seconds cancels

(meters) = (meters/second) * (seconds)

which leaves us with meters only

but with x=vt^2, you would have (meters) = (meters/second) * (second)^2

which would leave you with:

(meters) = (meters)*(second) which is not right

[hexed sparrow]

Thanks so much!

[hexed sparrow]

Here's my notes on it

[agile torrent]

thank you so much

[agile torrent]

this makes sense now thanks

[lone juniper]

But won’t B and C crash at the 40th second if the acceleration remains 1m/s2 for B? Coz C will cover 1km in 40 seconds wrt A and so will B wrt A with an acc of 1m/s2. Ping me please

[brittle hornet]

peeps help me out here very simple qs y I cannot think TT

could anyone pls teach me

[viral sorrel]

use newton 3rd law, when going upward the lift is applying an upward force on the boy, so the boy is applying the same force but downward (same direction as the weight)

the weighing machine measures the force applied on it/g

[ruby sequoia]

I don’t know how to solve this at all. I’ve looked for videos on it on YouTube, and none of them explain how to do this particular kind of question. Please ping in reply. Thanks in advance.

[hollow prairie]

Could someone can help me with this chemestry problem?, it's in Spanish but it's related with stoichiometry:'(

[dull zealot]

can anyone help?

[cedar mesa]

@dull zealot since f=ma, you have same f and ratios of m => determine ratio of a, thus ratio of travel time using s=1/2at^2 for same s

[vivid sequoia]

i think you should also understand the concept of pseudo force . Whenever you are observing a body in a accelerating frame from a non accelerating frame a pseudo force is applied in the direction opposite to the motion .

while moving up the force acts down along with wt so T = F + W

while movind down the force acts up opp to wt and along the tension so T = W - F

[dull zealot]

thank u so much

[brittle hornet]

for qs.15, I got 2000ms-²

can someone teach me

[rare dagger]

Did you solve it?

[rare dagger]

@brittle hornet here is the solution:

https://acrobat.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3A3c955d47-a431-4d12-b704-95308333257c

[brittle hornet]

I don't understand y v-25ms-¹/120s become -5/24 ? where did the v go

[runic quail]

any physics students?

[brittle rivet]

i think that they already calculated v3-v2, do you have those values?

[tepid oasis]

Isn't v= m/s if v is being used as the symbol for velocity? If thats the case then change in velocity is -25 cos v2 > v3, the fraction is then simplified by dividing both numbers by 5. But I'm still not sure if I answered your question, cause I'm not that good at physics. @brittle hornet

[sullen plume]

Why are the electrons not paired in 3d?

[fierce socket]

because 3d doesn't contain isotopes idk ( i learned this during hs but forgot)

something like. the electrons or some particle doesn't go along with the shell

idk how to explain and i forgot

[fierce socket]

then just shut up lol

[sand citrus]

Hund's rule

[scenic drum]

are sig figs used to calculate amu?

[limpid idol]

Question : A thin fixed ring of radius 'a' and a positive charge 'q' uniformly distributed over it. article of mass 'm' and having a negative charge 'Q' is placed on the axis at a distance 'x' (a>>x) from the centre of the ring. Find the time period of oscillation of negative charge.

Can someone help me solve this? Its from the topic Coulomb's Law

Please ping me, if you'll reply. Thank you!

[thorny gyro]

Two-point masses A and B of mass m and 2m respectively are free to move along a smooth circular path in a horizontal plane as shown in figure. Before colliding with mass A (which is initially at rest) elastically, mass B is moving with speed v. Then after this collision how long it takes for next collision between two masses?

Could someone please help me with this ?

[heady vapor]

You know the equation for the electric field due to a ring of charge is as follows

where, P is the point with mass m, and Q in this case is your q over the ring

so the force on the particle would be (expressed in terms of the quantities you gave)

F =- kQqx/(x^2 + a^2)^(3/2)

in the x direction

and then set up a differential equation:

F = ma = m d^2 x / dt^2 = -kQqx/(x^2 + a^2)^(3/2)

You get a messy 2nd order differential equation which isn't a simple harmonic oscillator

but if you approximate by considering x << a, then you can do a series expansion and take the first order approximation

and you'll end up with the equation for a simple harmonic oscillator

and then you can simply group the resulting constants and get the frequency

and then get the period

Note that the velocities in the above are only true right before and right after the collision

[heady vapor]

Since the first collision is elastic, you know that kinetic energy and linear momentum are conserved (in the y direction)

Use this to find the velocities of the particles right after the first collision: http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html

We know that linear momentum is conserved when there is no external force. Note that although there is a centripetal force acting on the particles, it is acting perpendicular to the y direction, which means that the linear momentum in the y direction is still conserved.

Since the circle is smooth, you can assume no friction and no acceleration tangent to the circle. Even though there is a centripetal acceleration on the particles (this is what keeps the particles accelerating by changing directions and moving in a circle), the lack of a tangential acceleration means the particles don't change their tangential speed around the circle

So you can treat this as a case of uniform circular motion.

And then solve when the positions of the particles are the same

[woven grove]

because this way the repulsive force between the electrons is way lower and the atom is more stable

[raven ocean]

can someone help me with this bio question

[wintry ginkgo]

I guess you have to describe how and why they immobilise enzymes, present the characteristics of Chlorella and finally list the steps of immobilising chlorella based on the way they immobilise the enzymes and the different characteristics of chlorella. (I'm from France and this is what we are used to do these so idk how you do it in your country)

[sullen plume]

Thanks 🙂

[raven ocean]

okay thanks , this was from a level biology paper

[frank marsh]

you could join this server for more information

hm sorry nvm it's not letting me send the link

i'll dm you

i think you need to allow me to send you a dm

[frank marsh]

sent

[frank marsh]

Of course! Good luck studying 😄

Sort of... I participate in Science Olympiad at my school

It's kind of like the other olympiads... 🤷‍♂️

Yes yes it's not individual, each school has a team and those teams compete against each other in tournaments across the nation/state/regional level

Thanks and you too 👍

[wraith stone]

Try halliday resnick for the theory

S.S. KROTOV for problems

Then you can refer to some higher level standerd books

[thorny gyro]

Can someone help me do basic math on domain and range?

I have a bunch on questions

[fleet fossil]

I can… i can tryyyy

Its been a while

Lemme pull out my notes

[thorny gyro]

it s easy

[marsh briar]

hmmmm

cannot attain means cannot reach right

so I think, the real number tha f(x) is not defined is when x = 1

[thorny gyro]

thank you

[marsh briar]

and function f(x) cannot attain should be 0?

cz the top is already 1

and there is no way the function can be 0 i think

or did I just understand the question wrongly

since my english is not that good

[thorny gyro]

so the answer to 1 is 0 and 2nd qn is 1

[red sundial]

Anyone know if I did this right

My professor confusing me

[marsh briar]

I think is 1 for the first 1 and 0 for the second one

[thorny gyro]

yes sorry that s what I meant

[marsh briar]

np

wait hold on

[thorny gyro]

thank you for helping me out

[marsh briar]

np at all hehe

[thorny gyro]

<3.

[marsh briar]

im not sure abt the ketone but I think other two is correct

as Ik ketone is connect to 2 R group

but does R group contain N?

[red sundial]

Let me check

My friend told me it was ketone but I’m not too sure

[thorny gyro]

nope

[marsh briar]

aight

so thats not a ketone I think

[red sundial]

Oh wait Im too specific I think he just wanted me to put carbonyl

[marsh briar]

because it specifies two R

[red sundial]

Ye

[marsh briar]

but carbonyl is

[thorny gyro]

some type of amide ig?

[marsh briar]

either double R or R and H right

[marsh briar]

Im thinking abt that as well

[red sundial]

Oh wait no yeah it’s douvleR or H

[marsh briar]

but I havent study amide yet

so it shouldnt be a

carbonyl

[thorny gyro]

yep

[red sundial]

Why the fuck is this in biology

[marsh briar]

yo wtf

THIS IS BIO????

[red sundial]

I thought I dodged chem

Yea

[marsh briar]

i thought this is chem

[red sundial]

This in my bio 2 class

[marsh briar]

but then yeah

bio chem highly related

[thorny gyro]

nope that's a nitrogenous base

sorry wrong ping

[marsh briar]

now that a

bio term

[thorny gyro]

the structure is of thymine

[red sundial]

Thanks

[marsh briar]

I thought is cytosine

lmfao

I mean i cant really tell

Im just a poor alvl student

[red sundial]

This class is just trying to murder us at the start

I took bio route to dodge stupid chem stuff

I was wrong

I’d rather have just taken chem straight up

[marsh briar]

life will nvr go in a way that u want it to go lmfao

[thorny gyro]

well all i know is thymine is 5 methyl uracil
and cytosine has no hanging methyl grp
process of elimination 😁

[marsh briar]

dang ok

nice

[tame rose]

what energy conversion happens when we train our muscles?

[dull zealot]

can anyone help?

[thorny gyro]

By “astronomy” do you mean you study celestial mechanics as well? If so it’d be fantastic if you could recommend me some of the books you’re using, that’s one of the topic I’m weakest at . Thanks in advance

[thorny gyro]

Thanks a lot 🤜🤛

[crisp ether]

Hey.... I hav a doubt when Converting Methyl Chloride to Ethyl Chloride... Can't it be done with Wurtz Reaction and Correy House Synthesis???

[sterile flare]

hey can someone help explain this to me?

I really need help understanding this practice exam problem and how to solve it in my electrical engineering class

How do I find IV curves given a circuit and vice versa?

It's problem 4

I was even given the answer sheet

but it doesnt explain how they got it

and im having trouble finding out how online

please help

[frank marsh]

Can anyone advise?

[fierce socket]

sorry eng is not my first language

but

try using potential energy formula

WAIT no

i forgot

use newton's law

2nd newton law

i sound so unhelpful

i studied physics before in hs but i forgot

[next cedar]

hii does anyone know if protozoa are a phylum of kingdom animalia?

[next cedar]

and is protozoa a kingdom, phylum, class, domain, what is it?? i don't understand its classification

is it under kingdom animalia? pls help

[crisp ether]

Protozoans are a part of Kingdom Protista. It's hierarchy is Plyla probably..... Protozoans are actually animal like Protists so don't get confused...

Kingdom- Protista

[next cedar]

oh alright thanks so much

[thorny gyro]

need help! topic: reflection of light!!!

[finite gulch]

90 degrees

[thorny gyro]

Hi, can someone please help me solve this?
Physics - Gravity

[thorny gyro]

thank you! this really helped today ❤️

[finite gulch]

anytime

[thorny gyro]

question 30?

[thorny gyro]

73?

[random trout]

convex and maturing i guess

[random trout]

D

[random trout]

so you cant perform a wurtz reaction coz there is no Sodium present and you need a sodium for the wurtz reaction to take place

[eternal locust]

why is oxygen being hybridized

can anyone tell me how to find angle 3

[crisp ether]

I don't think they have specified any reagents

[midnight canyon]

OOO it's real easy see it's simple

Double bond always attract electrons remember that

So if oxygen take up one electron right
Then there will be bond vacancy

So hydrogen will donate it's eletron

[thorny gyro]

Kinda like water ig
About 104.5 degrees
Btw is the answer C?

[young quarry]

yes

lone pairs take more space than bonds

[eternal locust]

yes

I didnt understand anything

[covert viper]

would distillation or a separating funnel be better to separate dcm and water

[next cedar]

Any med/pharma students here who can read a prescription for me? I can send in DMs

[visual warren]

CS/math related stuff:
i am done with HS, and hopefully be studying CS in college. i've heard a lot about the importance of being good at basic programming, as well as getting an intro to discrete mathematics. Since I have time before college begins, I'd like to study these in my free time.
Is there anyone that would give me some info/advice about this?

[fierce socket]

ummmm be prepared for lots of math

but cs is enjoyable

ummm have fun?

try learn a bit basic stuff first

[visual warren]

can u pls elaborate on this?

because i did hear a lot about math, but i'm not quite sure where i should begin

[fierce socket]

um

try begin from yt tutorials

[fierce socket]

you can also

try learning from minecraft edu edition

[gritty moss]

lol

[woeful furnace]

Distillation is better to separate dichloromethane and water. Both are polar molecules, so a separation funnel would be more difficult since it is hard to dissolve one liquid in a non-polar solvent and the other one in a polar solvent to separate it. However, distillation would be better because DCM has a boiling point of 39.6 degrees Celsius and water has a boiling point of 100 degrees Celsius. The large difference in boiling points will allow you to easily heat up the mixture to 39.6 degrees Celsius to boil the DCM out of the solution and complete the distillation.

[thorny gyro]

question 25 answer will be b, right?

[keen tulip]

Yes

[thorny gyro]

Explain how?

[fallen radish]

yo

is the one in the terrible quality image polar or nonpolar? cuz in my textbook it shows it being nonpolar but it has an uneven distribution of charges so i'm not so sure.

[young quarry]

the bulk part of the molecule is the phenyl ring and carbon chain so unpolar

[inner zephyr]

If a horizontal support exerts an upward force of 10 N on a block of weight 9.8 N placed on it, which
of the following statements is/are correct. Assume acceleration due to gravity to be 9.8 m/s2
.
(A) The block exerts a force of 10 N on the support.
(B) The block exerts a force of 9.8 N on the support.
(C) The block has an upward acceleration.
(D) The block has a downward acceleration

can u just explain like why is the||a||part correct

i figured out the second correct ans but cant with first art

[nimble lichen]

"Growth that occurs when factors such as availablitity of food, predators, and disease limit the population size"

Anyone know answer to this?

[rotund chasm]

If the support is exerting 10 N of force on the block, there is always an equal and opposite force pushing back from the other object. In this case, the box would be pushing back at the support with an equal 10 N of force, and if the weight of the block is only 9.8 N, I am assuming the other part of the answer is that there is some downward acceleration from the block as well since in Newtonian physics F = m*a

[thorny gyro]

Logistic growth

[visual warren]

ooh lol

[eager atlas]

could someone pls help me understand the last green bullet point

[formal mulch]

Can anyone help me with this derivation?

[sage kettle]

hv = (hc)/lambda
delta E = h*v

when you substitute h*v for delta E it follows=

delta E = (h*c)/lambda

which shows the connection between the wavelength of the absorbed photon and the energy difference
(lambda = photons wavelength; c = speed of light)

[eager atlas]

i’m still so confused, wouldn’t it be delta E = h*(c/lambda)?

[polar mortar]

There’s a general formula we follow where different types of gametes = 2^n
Where n=heterozygous alleles of genotype
In this we crossed TTRR x ttrr which resulted in F1 generation of TtRr
Here both the genotypes are heterogeneous so n=2
Had we gotten an example like : calculate unique types of gametes of AaBbCC then n=2 and not 3 because CC is homozygous, it would not contribute to a unique combination hope that makes sense

[polar mortar]

Yes it is! c= ν lamba
We just substituted that into the
E=h ν formula

[ocean mural]

Can someone explain to me how to do this?

[queen osprey]

im not sure if its correct though

[eager atlas]

so how does that relate the frequency of the photon to the difference in energy😭😭 i still don’t understand

is it because the planck constant stays the same throughout and the frequency is directly proportional to the energy?? that’s the only thing i can come up with

[sage kettle]

Yes, thats righht. The Planck constant is a constant as the name suggests. also is the speed of light given for certain conditions like a vacuum for example. You can see that lambda is the only changeable value in this equation and directly influences the energy difference.

[eager atlas]

alright thank you, i get it now

[thorny gyro]

Can someone explain this calculation?

[long elm]

idk if you got an answer yet, but what do you need help with? like do you want someone to explain how they go to each next line?

[formal mulch]

I figured it out by myself

Thanks for responding!

[forest falcon]

Hello, is anyone here knowledgeable about bacterial pan genome analysis (BPGA)? I tried using it on 7 strains and couldn't find any core sequences among the strains of the species. Does anyone know any troubleshooting material for BPGA?

[quick rapids]

can someone help me

i got 5 sqrt 5 but its wrong

[sterile idol]

5 sqrt 5 is right, but it can also be written as sqrt 125

[mellow breach]

Hello. I am having trouble understanding the difference with hypotonic and a hypertonic solution

A simple video yet not so simple for me to understand it. I don't know why I keep getting it mixed up

https://www.youtube.com/watch?v=FU9xE8rxnOo

This video is so much helpful 🤩

[thorny gyro]

Studying the prefixes might help! Iso means equal, so there is an equal concentration of things inside and outside the cell. Hyper means above or excessive, so there is an excessive amount of substances outside the cell, causing water to rush outwards towards the salt, as water does. Hypo means less than, so there is less substances outside the cell. Water would then travel inwards to the cell where there is more substance. I hope that helps!

[thorny gyro]

It's actually very easy.
Hypotonic
-> solution having less solute content and more water than other.
Suppose you have resins you put in the water for overnight and next day you observed that the resins swelled up. It is because the concentration of water us more in the surrounding medium than in the cell so water will move inside the cell and this is known as endo osmosis(Osmosis is the movement of the water molecules from the region of higher water concentration to the region of lower water concentration.)
And 2nd
Hyper tonic
Solution having more solute concentration than of water in comparison of other.

Now you have kept Resins in salt solution. After some time you'll observe that the resins shrinked.it is because water has move outside the cell as there is low water concentration outside the cell and more solute. This is called exo Osmosis.
I hope this helps

The most genuine example of hypertonic solution is when we wash cloths in detergent solution we observe that their is shrinkage in our fingers.

[little holly]

Yo

Can anyone explain neuro-Muscular development in easy words

[kindred rain]

how to study 6 ch of science in 2 hrs

[kindred rain]

the ability of the nervous system to efficiently recruit a muscle or a group of muscles in order to perform a specific task unconsciously

ans is 5m/s

[kindred rain]

plz tell

anyone

??

[little holly]

Isn't possible, u have to study for more than 2hours for completing 6 ch

[steel basalt]

If you read before then you might check the important lines, stuff? Like notes?

[steel basalt]

Have you finished those chapters before?

If yes then it can be quick, if you ignore the basic stuff.

[warm jolt]

Can someone help me with part 2 😦 especially the momentum of electrons

[thorny gyro]

is the answer A?

if so why?

[kindred rain]

yep man! But i have scored 2nd in the class

in science

but thx

[kindred rain]

-_-

thx

[steel basalt]

If you have the notes then you can check those? I do those.

[little holly]

👌

[nimble lichen]

Can anyone make an hypothesis on this question "How does soap affect the water's surface tension?" and explain why?

[jolly basin]

i need help in histology

[knotty forum]

https://www.youtube.com/watch?v=BuxFXHircaI

A music-video dedicated to E=mc^2

[fleet fossil]

Formula labrith

[worthy stag]

Formula labrith +

[tight raven]

Man

I got a 73 on my bio exam

I seriously thought I got like 85 and above

Worst feeling ever

[restive quest]

can someone help me to understand how to make the lewis structure of the 2) and 3) ??

why N and S seems to have 4 electrons of valence

[thorny gyro]

I am doing a project on proving joule's law of heating...but currently my lab is closed so can anyone help me with the reading of the experiment?Like if current supplied is x and resistance is y what will be the temp rise...when mass of water is suppose alpha and initial temp is beta...I need the values of all these parameters

[sturdy sapphire]

Hey! Could someone help me with a general chemistry problem from my quiz I got wrong. I can tell I'm close to the answer I think I'm just missing a piece.

Here's the question: 2.5g of an alkaline metal (group 2 on the periodic table) reacted with HCl and yielded 0.75L of H2 at 300 degrees Kelvin and a pressure of 2 atm. Which metal was reacted? Mg, Ca, Ba, or Ra?

I was also provided this step-by-step process for how to solve equations like this, and I did all the work but I got an answer of 41 g/mol for the atomic weight of the element which isn't any of the given answer

[umbral girder]

can anyone help me with my physics hw?

[thorny gyro]

https://dontasktoask.com

[indigo beacon]

anyone can help with java progrsmming

[sudden steeple]

Doubt in Chemistry,
why is Metal Oxide a bad conductor of electricity?

[digital raptor]

Any Java experts around who are willing to commit into looking into my problem, whatever that may turn out to be, even if it's not actually related to Java or if someone who doesn't know anything about Java could actually answer my question?

[vale mesa]

For entropy, why is it that a negative value in free energy means in spontaneous?

[vale mesa]

As the bonding in metals with its outer electrons make a sea of delocalised electrons, the electrons can then pass the energy onto other electrons in that sea making it good

Since metal oxides now having oxygens cant have the metallic bonding like that (I assume because the outer electrons are used to bond with oxygen), they don’t have that sea and therefore can’t conduct

[sudden steeple]

oh, thanks

[dire shuttle]

seems like no one replied (uh nitrogen lost the unpaired electron thats y it has 4 left and made 2 double bonds with the left 4 valence electrons and about carbon it took 2 electrons .........i havent seen this compund yet im learning basics only rn so yea....but i guess this was the reason lol

[timber palm]

Anyone able to explain this step in DeMorgan's Theorem?

[thorny gyro]

You could derive it or simply treat it like-
(a+b).x

Where a= A
b=B.C
x=A.Bdash

[urban socket]

Ayo, is there any advantage for why dendrites are branched?

[urban socket]

Like why did they have to be treelike when they could’ve not?

[thorny gyro]

What other shape are you contemplating?

[urban socket]

Something smooth

[thorny gyro]

It is smooth-in a way-and by smooth I hope I am correct in inferring dendrites not being pointy...
Well it is smooth on a microscopic level

I think dendrites appear the way it appears for improved surface area for channels and better packing (?)

[urban socket]

Alright, could be

[thorny gyro]

I think the goal when forming some sort of a neural network is to , well, network. By that I mean each cell is designed so it can connect with as many other cells as possible

I’m not a bio student so that was purely guessing

[fluid bobcat]

dendrites have small extensions called dendritic spines, where they can receive action potentials to be propagated down the dendrite and toward the cell body.

by being branched, not only does that increase the surface area at which action potentials can be received (and therefore the number of different neurons that can carry different sensory information) but it also means that there are multiple directions from which you can receive sensory info. its just optimization.

[urban socket]

Wouldn’t having multiple directions to receive sensory information lead to information overload and result in something harmful to the brain?

[fluid bobcat]

that's a good question. yes its definitely possible. if you are in an environment where you are receiving a lot of sensory information all at once (e.g flashing lights, loud noises, multiple conversations and multiple things requiring your attention)

but also consider - without the network of neurons and axons, we would receive and respond to information very slowly. the result would be that our body would not be able to respond to changes in temperature, and other stimuli. our ability to survive would be greatly impaired.

so its about maintaining a balance, and if you reflect on just how much information you can personally process and respond to, you'll probably realise that it would take quite a lot of sensory information to overload someone. it might be different for people sensitive to certain stimuli and those that are neurodivergent

[thorny gyro]

Its not sensory information,its just a stimulus that's passing through
Like -' tell Tom that Bob called'
And each neuron passes that info to the next neuron until it reaches a neuron/part of brain called Tom from the sensory stimulus catching organ called Bob

Remember not to confuse the message i.e. the stimulus with the conversation between Tom and Bob

Tom knows what Bob is talking about but the neurons in between do not

More the stimulus more the urgency such that the end neurons tell Tom to 'call Bob or he will die!!'

Its upto Tom if he is overstimulated or not
The neurons in between don't care at all

I hope you do realise that Tom and Bob are not people

[thorny gyro]

And no it's not possible

[thorny gyro]

Our brains are designed and evolved in a way to absorb everything
However if you are a jellyfish you can block somethings out to protect your tiny 'brain'

[warm lynx]

^^

there's a saying called "drinking from a firehose"

[clever raptor]

why is this D

[clever raptor]

nvm

[sterile flare]

so if i was given a capacitor that had two dielectrics in series inside of it, and given both layers thickness and dielectric constants, how could I figure out the electric field in the dielectric?

[swift fiber]

https://youtu.be/ALgYs1BebPA

[thorny gyro]

is there anybody good at chemistry who is trying jee advanced willing to explain periodic properties of elements on a vc?

[thorny gyro]

gravity is directly proportional too size

thats why jupiter has the highest gravity

[next cedar]

guys where do you find books online? like i need to find any book on plasmodium but i cant find one just by googling it

[granite wasp]

can someone help me with this one?

[sudden cedar]

Can someone help me on this pls

Is this right?

[thorny gyro]

can anyone help me on this? i don't get it

[night swallow]

Quick question, are there any forms of batteries that do not go under the wet cell or dry cell category?

Like does a third alternative exist?

[gritty moss]

who wrote this question

[white fern]

its cprrect

[crude coyote]

Goys: the right auricle receives deoxygenated blood through?

Biology, heart

[thorny gyro]

if anyone is smart with chem can u please try to explain why HO3+ is an acid and why OH- is a base im so confused

[umbral girder]

Can someone help me with my physics hw?

[muted spear]

i can also try to help physics

:)

except i learned in 8th grade

and its been a long time

2 yrs

so i might have forgotten alot

[leaden ridge]

Guys how to to check the min speed

This is the solution on the site (and I got the answer)

But it doesn’t show the weight so idk how to check

[rapid dirge]

Hello anyone who has done earth life science and still has their stuff on dna sequencing by sanger?

[lilac rock]

I'm sorry, I'm stupid

the mass is 10kg, the angle is 30, the friction is 0.5, and the force acting on the body of mass 10kg is 200N at an angle of 30 degrees, g=9.81m/s2.

What is the acceleration

i got 13.94m/s2 I don't know if that is correct

[echo aurora]

https://cdn.discordapp.com/attachments/715577819421343754/1029899690419966002/unknown.png Can someone explain to me when you need to switch the exponent from negative to positive in unit conversion? (dimensional Analysis)

[thorny gyro]

I’m guessing the “numerator” converts to the “denominator”?

[crimson pivot]

How can I measure phosphorus in a plant? I am able to grind up the plant, but I am unsure what type of test I would use to determine the level. Thanks.

[cunning crescent]

It's about different sizes of the units. Km>m>cm. The first one is wrong, 10m = 10^-3km. So whether the exponent is positive or negative depends on whether you're switching to a larger or smaller unit

[young quarry]

the positive charge also shows if they are more likely to donate H

[thorny gyro]

can someoe please help me with this

[dusky quest]

does anybody know the game mastermind and could possibly help me? pls

[noble marsh]

what u need help for ?

[dusky quest]

so I have this homework about finding out the correct code or something and I am trying so hard to solve but I lost all hope

[eternal locust]

dunno

[gritty moss]

its really bad

[woven pivot]

GUYS wth is this compound (((NH3)(CO2)(C2H4)S)2(C12H20O10)2(S02)5)

[woven pivot]

I’ll try, pubchem didn’t find it tho 😳

[thorny gyro]

Please, does someone know how do i change border color of a single row

in Html, Css

[thorny gyro]

Can someone explain Q6 with reasons?

[pearl stream]

Try to draw structures of everyone all of them are carboxylic acids except one.

[wintry ginkgo]

Can someone explain to me how does a Reversed phase Chromatography work? And the Edman Sequencing? I can't understand them

[thorny gyro]

Alright, also, +I compounds belong to electron donating group or withdrawing group?

[pearl stream]

Electron donating group

[thorny gyro]

Okay thank you

[thorny gyro]

please answer this with explanation

[thorny gyro]

this one too

[twin mist]

Its AlCl3 becasue Al+3 doesnt realy give their electrons to Cl-, they simply share them like a covalent bond

Like this

[thorny gyro]

got it, thankyouu

[twin mist]

Also AlF3 is iyonic, dont miss that out

[twin mist]

And for this n (number of moles) is constant in other gas laws you can recheck the gas laws for that

[thorny gyro]

i see

[thorny gyro]

anhydrous AlCl3 is covalent

[twin mist]

Yes

[sterile flare]

could anyone help me answer this electrical engineering problem?

Im lost as how to approach this problem

It's finding the maximum carrier density inside of a mosfet

[sterile flare]

given oxide thickness and voltage

[thorny gyro]

how does the primase determine the number of bases to jump over in the lagging strand?

[modern apex]

guys, I need your help for this question: Identify at least three reasons why possessing a specific DNA sequence may not always correspond to a specific human characteristic.

[thorny gyro]

hey i don't know if my reasons qualify your argument or not but here goes nothing to give you some inspiration to get you going--
firstly on reading your question one thing bounces out and that being; that it is asking for a "specific human characteristic"
-specific: means specific ; for the sake of this question let's make use of an example such as 'human skin pigmentation' which is confirmed to be controlled by atleast 3 genes (there are many more genes controlling the one factor-(polygenic inheritance) but for this example lets not argue and assume that it is 3) so 3 genes ---->5 phenotypes
For a person to be an albino, all 3 genes must be recessive ; shall even 1 gene give a dominant trait-the person will not be an albino
so for a "specific human characteristic such as albinism" more than one gene is involved- hence your given specific dna sequence may not always correspond to a specific human characteristic/phenotype and may not give the albinism condition without its other 2 friends pitching in1

-not all dna sequences in a human genome expresses itself. You would be surprised to know that a majority of the human genome actually doesn't code for anything substantial at all.
So it is entirely possible that your specific dna sequence is junk dna and wouldn't correspond to a specific human characteristic2

-mutations-->although during replication mutation is highly checked over by the proofreading activity of exonuclease; during transcription and translation mutations are pretty common and easily neglected over(actually there is no proof-reading during gene expression )
so if you don't end up getting your "desired specific human characteristic" even though you have your entirely innocent and hard-working dna then the culprit is indeed mutations
mutations can lead to change in phenotype and thus bringing the reason no.3 of why my specific dna sequence not giving the right human characteristic? ;))

ps-i might be wrong. point it out whenever

[modern apex]

I think I have almost the same answer just like yours

Thank you anyway

[thorny gyro]

why is that when telomeres are gone the chromosome stop functioning properly? it's not like they-(telomere) code for anything significant...or do they?

[twin mist]

I am pretty sure that they dont code anything

[thorny gyro]

yep exactly so why are cells dying cause of it?

😩 .

[twin mist]

Because it helps the segmentation (if thats the correct word)

If a cell cant segmentate it simply dies from overextention

[thorny gyro]

oh

okay thanks

[twin mist]

Also it protects chromosomes from seperating randomly from the ends

[thorny gyro]

wait telomere must be present at end of linear dna molecules in eukaryotic chromosome...but for segmentation shouldn't it be present in the middle?

not exactly middle, you know what i mean

like at regular intervals

[thorny gyro]

pls elaborate on this...how?

[twin mist]

It covers the end parts like this

[twin mist]

Forget about the segmentation part because i used the term segmentation wrongly

Sorry for late reply though

[thorny gyro]

no worries and thanks!!

[little holly]

Hey guys, I am studying in class 11th , currently studying Redox reaction
I want to study ELECTRO CHEMICAL CELL topic properly but I don't know how to study it properly and from which YouTuber to study from
Can someone help me with it

[thorny gyro]

how does this compound show resonnance

[thorny gyro]

try a youtuber called allery chemistry

he is based on a level chemistry but he is very helpful

[thorny gyro]

if anyone could help me on this it'd be greatly appreiated

[inland phoenix]

☹️☹️

Idk whats wrong. I even googled it

(Chem 2 btw)

[shy bobcat]

https://en.wikipedia.org/wiki/Information_theory

can someone eli5

[fast fable]

What’s your problem?

[thorny gyro]

need help with this

[sudden steeple]

Double Displacement

1. Ag2CO3 + KNO3
2. CuCO3 + K
3. Al2 (CO3)3 + KNO3
4. Ag3PO4 + NaNO3
5. Cu3(PO4)2 + NaNO3
6. AlPO4 + NaNO3

Neutralization

1. NaNO3 + H2O
2. Na2SO4 + H2O
3. Na3PO4 + H2O

...

[thorny gyro]

thank you!

[sudden steeple]

no problem!

[shy bobcat]

what is the underlying theme/what is trying to be uncovered in the field of information theory

[thorny gyro]

This is a googleable question

https://redwood.berkeley.edu/wp-content/uploads/2018/08/info-theory.pdf

https://en.m.wikipedia.org/wiki/Information_theory

https://www.sciencedirect.com/topics/neuroscience/information-theory

I can give you way more

[craggy comet]

Unpopular opinion:
•Kinetic Model Of Gases sucks.
Fun Fact: The so called "Legendary" Van der Waals equation gives right results only with wrong assumption of Excluded volume lol

[raw tree]

Why we use these formulas? I couldn’t understand. (Significant figures) does anyone who can help me?

[limpid venture]

friction will act in forward direction....not sure about drag and thrust

[steady flame]

Hi guys if any one needs MBBS PDF Books Genre : ANATOMY Dm me !!!

[thorny gyro]

when salt dissolves in water why does the mass of the solution decrease

[steady flame]

The mass should increase by 5g, no less. The volume won't increase by the volume of salt you added, though. This is for many different reasons among them the fact that salt is in grains (with lots of air in between) and the salt dissolving in the water and kind of squeezing in the spaces between water molecules. But the mass should increase by exactly the 5g you added. A small kitchen scale (up to 1Kg in .1g) should suffice to make a quick experiment at home . - quora

[thorny gyro]

thank uu

[fringe compass]

the weight is down,dk wht they mean by normal force,there's no tension,friction should be in the opposite direction with rocket's velocity caused by the air so friction should be down.there's no drag here.and thrust is up,which is the force the rocket feels becuz of the fuel

[nova garnet]

anyone know how to write a net ionic equation to show an ion is basic/acidic?

[silver coral]

you can use average velocity and multiply it by 6.3

Vavg in this question is (42+20) x (2^-1) = 31

and 6.3 x 31 = 195.3

so the car travels 195.3 ft during the 6.3 seconds

if acceleration was not constant this approach would fail

[white fern]

the frmula is s = vot + 1/2at²

You just have to count to find the answer......its59.5m or 195.3ft during 6.3ss

[quaint vapor]

adding to it

for finding acceleration,use the formula v=u+at first then u can go

but the avg velocity method given above is shorter

[gaunt swift]

3 please, @ me or dm me thx

[craggy comet]

Actual yield/ theoretical yield×100

Get actual yield by calculating the amount of pure iron that can be formed by 10ton of the iron ore

[winter isle]

you get the theoretical yield from that. the actual yield is already given, 0.67 tonne. if I'm not mistaken

[craggy comet]

Oops.

[winter isle]

all good

[quick rapids]

i dont get why its wrong

[quick rapids]

nvm

[thorny gyro]

delta x=1.65-1.50cm= 0.15cm=0.15*10^-2 m(SI unit)
F=kx
k=F/x
k=(16/0.15)*100=10666.67 N m^-1

[lethal field]

I don't know if you still need help with this question but I'll just go ahead anyways.

To find the maximum speed, you'll need the following equation;
v = u + at
u=0
a=3.6m/s²
t=2.7s
v=0+3.6×2.7
v=9.72m/s
-the max speed is 9.72m/s

Now to get the distance travelled as she accelerated, you'll use the equation
s=ut+½at²
We already know the parameters therefore,
s=½×3.6×(2.7)²
s=13.12m

Now to get the time it takes her to complete the entire race.
It takes her 2.7s to cover 13.12m out of 100m
The remaining distance, d=100-13.12=86.88m
V=d/t
Making t subject of formula
t=d/v
t=86.88/9.72=8.94s

Adding both times to get the time, T it takes her to complete the entire race.
T=8.94+2.7=11.64s

That's the solution.

[lethal field]

You're good to go. You just plug in and get your answer. Checked the first three, it's ok. I'm assuming the rest should be correct as well.

[vagrant bane]

Hi! Is there anyone who can recommend a book about thermodynamics or physical chemistry? I’m writing a report for experiments at school and I need to add references.

[white fern]

it's the same.he must have known that..

[craggy comet]

Peter atkins

[eager atlas]

anybody know why it's impossible?

[thorny gyro]

incomplete combustion; pressure temperature variance; impurities- that may negatively or positively catalyse the reaction -that may interfere with the reaction

[rotund dagger]

Peter Atkins' book

Like thiss

[rotund dagger]

Wheres the question.this is only about entalpy

[rotund dagger]

Its the enthalpy change when one mole of a compound burns completely in oxygen with all the reactants and products in their standard states at standard conditions (298K and a pressure of 1 bar).

[eager atlas]

yesss that is what the textbook says, but i’m asking why those conditions are impossible to recreate

[eager atlas]

there is no question, it’s just an extract from a textbook

[rotund dagger]

ok i think he is right…

[rotund dagger]

Yeah man

[echo aurora]

How did undertaking this project improve your understanding of linear motion?

Project: Creating a rubber band powered car
My current answer: This project helped me improve my understanding of linear motion because it showed that a car can move in a straight line when it is stable and sturdy. If the car is wobbly, the car will tilt in a direction and scrub speed.

Is that answer acceptable? I Don't exactly understand this question

[warm jolt]

How do one do part (ii) someone help me pls >.<

[zenith sphinx]

https://media.giphy.com/media/a2NA7vgkri1HsCUc70/giphy.gif

[agile torrent]

can someone please explain what "constant acceleration" means in the simplest way

[noble marsh]

okay but in which context ?

[agile torrent]

Like what does it mean when there is constant acceleration vs acceleration is zero

im thinking that constant acceleration means its just going at the same speed? or does it mean its constantly changing meaning speeding higher

[noble marsh]

acceleration zero --> speed always the same
constant acceleration --> the speed always increase linearly