# NSEP booster

Attention physics lovers!
Though NSEP is in November but i think its never too early. Therefore in this discussions we would try to cover as every concept at a stretch.

• Every week would have a topic for discussion and we would talk about every twist and turns in that topic so our journey to the mysterious island of physics start today.

I would also post questions in set named "Thats why I love physics" every week which I feel will definitely help.

i would like to include one thing out that the one who is good in one topic should help us out here.

Note by Aryan Goyat
4 years, 1 month ago

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i invite @Archit Agrawal @Prakhar Bindal @Somyaneel Sinha ,@ Pankaj gupta @Gauri shankar Mishra ,@Shiv Agarwal ,@Jyotisman Das ,@Nihar Mahajan @Rajdeep Dhingra @Swapnil Das @avn bha ,@Abhineet Nayyar @Zerocool 141,@Anirban Mandal for participating in the discussion.

- 4 years, 1 month ago

Hey , All your mentions are wasted. Even I didn't receive mine. I wanted this thing badly. Let's get started.

- 4 years ago

I would like you to keep the topics related to circuits and electrodynamics.

- 3 years, 11 months ago

Well @Aryan,I think i would like to join in to this stuff.I would really appreciate if you let me in.Since I haven't been active much,So if you could help me with things like where to start solving stuff? Thanks!

- 4 years ago

definately you can join .anyone can take part in the discussion i just invited some people so that at least some people can get to know about it.

- 4 years ago

new questions coming up?

- 4 years ago

Thanks for inviting me. Can we recommence?

- 3 years, 11 months ago

--------FIRST LAW----- the base of thermodynamics lies in the above three alphabets,U,Q and W. W-work done by the system(remember "BY") Q-amount of heat given to gas U-intenal energy What is intenal energy if anyone could define?(there would be a session of cross-questioning and answering at 1:00 pm on monday which would help us to deepen our concepts and then i would post a question related to topic,so be ready with the answers )

- 4 years, 1 month ago

Internal Energy Of Any System (Not necessarily an ideal gas ) can be simply defined as sum of the individual energy of each molecule (including kinetic,rotational,vibrational) in a frame wherein the centre of mass of the system is at rest

- 4 years, 1 month ago

Nice way of making center of mass at rest so as to express that we do not include energy due to external force field.

Now let us consider a case in which there is a container containing an ideal gas ,two situation are given state what is the change in internal energy using defination of it. take all the walls as adiabatic including the piston one.

- 4 years, 1 month ago

Well If a container is moving i think velocity wrt centre of mass will not change and hence there (molecules) energy will also not change. i think Change in internal energy = 0

- 4 years, 1 month ago

very true, since you had already added in the defination that we see energy in center of mass frame the both initial container and container in case B is in same situation.

- 4 years, 1 month ago

Now i will analyse case A (i think it will be a bit harder than case b) but still i will give it a shot

- 4 years, 1 month ago

Also i would like to add that temperature of gas will remain constant in case B Because internal energy of an ideal gas is only and only a function of temperature. Also if the gas was a real one that If internal energy remains constant then its not necessary that temperature will remain constant because for real gases U Depends on many other factors too

- 4 years, 1 month ago

thanks for this insight , but may you please list all the other factors in real gas case.

- 4 years, 1 month ago

Any thing that will change the intermolecular forces And intermolecular separations will change the internal enrgy of a real gas because Potential energy of molecules will change .Also as far as i know According to KTG For an ideal gas the intermolecular forces of attraction are neglected in case of ideal gases And hence i think These factors do not affect the internal energy of an ideal gas.

Any factor that will change a and b (vanderwaal's constants) will also alter internal energy

a is a measure of intermolecular force of attraction and b is responsible for excluded volume of a real gas

i also found a quite good piece of information at this link

http://public.wsu.edu/~scudiero/documents/Homework3-hints.pdf

- 4 years, 1 month ago

thanks for the explanation and the link.

- 4 years, 1 month ago

Hey will internal energy decrease in case A. If its correct then will add an explanation

- 4 years, 1 month ago

case A or B

- 4 years, 1 month ago

Its A Sorry

- 4 years, 1 month ago

internal energy will decrease.

- 4 years, 1 month ago

Ok Here is my explanation.Firstly as the process is adiabatic the net heat exchange with surroundings would Be Zero .Next using first law of thermodynamics Q = U + W ( There are change in internal energy and work done by the system).

We must have U+W = 0 . As the piston is moving then the volume of the gas will increase (gases have sufficient entropy to enclose whole of the volume they are put in). Hence work done by the gas would be postive (W = P(V2 - V1) ) .Now As W Is positive U Will be negative.

- 4 years, 1 month ago

nice one but let me tell you tell you one thing that the solution to this can be drawn without using first law and using your own defination. so internal energy decreases

- 4 years, 1 month ago

Oh brilliant! +1!

- 4 years, 1 month ago

the temperature in case B decreases as internal energy decreases and it is an ideal gas. Now can you tell why temperature and internal energy are related.

- 4 years, 1 month ago

i dont know how all the energy that constitute the internal energy depend on temperature but yes translational kinetic energy depends on temp {by KTG}=3/2{nRT} This would get you proff http://teacher.pas.rochester.edu/phy121/lecturenotes/Chapter18/Chapter18.html added to this

What is difference between internal energy of ice and water(both at same temperature ie O degree celcius)?

- 4 years, 1 month ago

I Will Analyze And Report !

- 4 years, 1 month ago

so now when you have to look for internal energy just sit in cm and then analyze ,answer would lie with you remember internal energy in dependent only on temperature in case of ideal only not in real , i would come to that point when we will come in mathematical analysis of thermo.

- 4 years, 1 month ago

--------FIRST LAW----- the base of thermodynamics lies in the above three alphabets,U,Q and W. W-work done by the system(remember "BY") Q-amount of heat given to gas U-intenal energy we already discussed about internal energy in our previous session and its more than clear now. What is "W-work done" if anyone could define and on what factors does it depend?

- 4 years, 1 month ago

But i want more people to participate not only just 2 people

- 4 years, 1 month ago

to deepen the concepts of work let us consider the situation. state in this case what will be zero heat supplied or work done by the system and why?

- 4 years, 1 month ago

- 4 years ago

hey thanks ! you should first read the underwritten text and then try my 2 questions on internal energy in set "thats not why i love physics" and then we will begin with discussion on work.

- 4 years ago

Most people have exams currently. 21st March is mostly end date for people's exams. We'll start then.

- 4 years ago

ok it`s fine then i would change the date declared.

- 4 years ago

Thank You for inviting me. I will definitely take part in it once my board exams are over. It will end on 15th of March.

- 4 years ago

You're in 10th? Boards?

- 4 years ago

Sorry. I meant Eleventh Final Exams.

- 4 years ago

When are we starting. We should start @aryan goyat @Gauri shankar Mishra @Anirban Mandal

- 3 years, 11 months ago

Exactly. I am seriously impatient.

- 3 years, 11 months ago

now only.

- 3 years, 11 months ago

- 3 years, 11 months ago

please choose a topic for discussion.

- 3 years, 11 months ago

Mechanics!

- 3 years, 11 months ago

I Invite @Aniket Sanghi Too

- 3 years, 11 months ago

Discussion is here or somewhere else

- 3 years, 11 months ago

On Slack.

- 3 years, 11 months ago

how to open it?? i am unable to open

- 3 years, 11 months ago

- 3 years, 11 months ago

Are all of you in Slack Chat ? If not join by clicking here. After you all have joined leave a reply to this comment.

- 3 years, 11 months ago

- 3 years, 11 months ago

I have already added @Gauri shankar Mishra@Aniket Sanghi@Prakhar Bindal@Swapnil Das@Adarsh Kumar to the channel on slack. Rest of you inform me when you join slack.

- 3 years, 11 months ago

I am in too!!

- 3 years, 11 months ago

i have joined

- 3 years, 11 months ago

- 3 years, 11 months ago

Which channel

- 3 years, 11 months ago

# nsepbooster , it is a private channel. I have added you in it.

- 3 years, 11 months ago

i have posted the very first ques for practice of mechanics NSEP titled elliptical cage though its little mathematical.

- 3 years, 11 months ago

I saw. I was working on it. Thanks

- 3 years, 11 months ago

I have joined it.

- 3 years, 11 months ago

aaj aa raha hai.

- 3 years, 11 months ago

I have added you in the channel.

- 3 years, 11 months ago

part-2 so here is my next ques 'may-be-this-is-more-easy-then-you-think' you can find it my set that's why i love physics

- 3 years, 11 months ago

here is my 3rd problem 'can you do it in 3 minutes'

- 3 years, 11 months ago

Can someone please tell me the cuttoff of nsep which was held on 22 november !!!!!

- 3 years, 11 months ago

different for different states.

- 3 years, 11 months ago

U know for UP

- 3 years, 11 months ago

- 3 years, 11 months ago

i know him its just a title and the ques are from different CPP,books and class problem .

- 3 years, 11 months ago

- 3 years, 2 months ago

You qualified NSEP? What were your marks?

- 3 years, 2 months ago

170 something just qualified :P.

- 3 years, 2 months ago

Thanks for inviting me! I would love to join the discussion. I am good at application part of first law, so I may be of help.

- 4 years ago

i have posted 1st ques for nsep in set 'that,s why i love physics' all of you should try it it title is 'Elliptical cage'

- 3 years, 11 months ago