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 "That`s 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.

## Comments

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TopNewesti 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. – Aryan Goyat · 10 months, 3 weeks ago

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– Rajdeep Dhingra · 10 months, 1 week ago

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

– Swapnil Das · 9 months ago

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

– Swapnil Das · 9 months ago

Thanks for inviting me. Can we recommence?Log in to reply

– Ayush Agarwal · 10 months, 1 week 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!Log in to reply

– Aryan Goyat · 10 months, 1 week 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.Log in to reply

– Ayush Agarwal · 10 months, 1 week ago

new questions coming up?Log in to reply

Ok guys lets start with Level 2 one i mean INPHO.Check out my newest post . – Aryan Goyat · 2 days, 16 hours ago

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– Swapnil Das · 2 days, 16 hours ago

You qualified NSEP? What were your marks?Log in to reply

– Aryan Goyat · 2 days, 16 hours ago

170 something just qualified :P.Log in to reply

@puneet manglaPlease give some advice for NSEP. Also what is the name of your book ? – Rajdeep Dhingra · 8 months, 2 weeks ago

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– Aryan Goyat · 8 months, 2 weeks ago

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

Can someone please tell me the cuttoff of nsep which was held on 22 november !!!!! – Gauri shankar Mishra · 8 months, 3 weeks ago

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– Rajdeep Dhingra · 8 months, 2 weeks ago

different for different states.Log in to reply

– Gauri shankar Mishra · 8 months, 2 weeks ago

U know for UPLog in to reply

here is my 3rd problem 'can you do it in 3 minutes' – Aryan Goyat · 8 months, 3 weeks ago

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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 – Aryan Goyat · 8 months, 3 weeks ago

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Are all of you in Slack Chat ? If not join by clicking here. After you all have joined leave a reply to this comment. – Rajdeep Dhingra · 8 months, 3 weeks ago

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– Archit Agrawal · 8 months, 3 weeks ago

I have joined it.Log in to reply

– Rajdeep Dhingra · 8 months, 3 weeks ago

I have added you in the channel.Log in to reply

– Aryan Goyat · 8 months, 3 weeks ago

aaj aa raha hai.Log in to reply

@aryan goyat@Gauri shankar Mishra @Jyotisman Das @Ayush Agarwal @Aniket Sanghi @Somyaneel Sinha @Archit Agrawal @Anirban Mandal @Shiv Agrawal – Rajdeep Dhingra · 8 months, 3 weeks ago

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@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. – Rajdeep Dhingra · 8 months, 3 weeks ago

I have already addedLog in to reply

– Aniket Sanghi · 8 months, 3 weeks ago

Which channelLog in to reply

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

– Rajdeep Dhingra · 8 months, 3 weeks agoLog in to reply

– Aryan Goyat · 8 months, 3 weeks ago

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

– Rajdeep Dhingra · 8 months, 3 weeks ago

I saw. I was working on it. ThanksLog in to reply

– Aryan Goyat · 8 months, 3 weeks ago

i have joinedLog in to reply

– Rajdeep Dhingra · 8 months, 3 weeks ago

I have added you.Log in to reply

– Neelesh Vij · 8 months, 3 weeks ago

I am in too!!Log in to reply

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– Prakhar Bindal · 8 months, 3 weeks ago

Firstly i think we should fix a time each day for discussion otherwise only few people will participateLog in to reply

– Aryan Goyat · 8 months, 3 weeks ago

great then 1-3pm tommorowLog in to reply

– Prakhar Bindal · 8 months, 3 weeks ago

so please invite all mentioning time.Log in to reply

I Invite @Aniket Sanghi Too – Prakhar Bindal · 8 months, 3 weeks ago

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– Aniket Sanghi · 8 months, 3 weeks ago

Discussion is here or somewhere elseLog in to reply

– Rajdeep Dhingra · 8 months, 3 weeks ago

On Slack.Log in to reply

– Aniket Sanghi · 8 months, 3 weeks ago

how to open it?? i am unable to openLog in to reply

click here. Login by entering your email and all. – Rajdeep Dhingra · 8 months, 3 weeks ago

go toLog in to reply

please choose a topic for discussion. – Aryan Goyat · 8 months, 3 weeks ago

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– Prakhar Bindal · 8 months, 3 weeks ago

Mechanics!Log in to reply

When are we starting. We should start @aryan goyat @Gauri shankar Mishra @Anirban Mandal – Rajdeep Dhingra · 8 months, 3 weeks ago

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– Aryan Goyat · 8 months, 3 weeks ago

now only.Log in to reply

– Prakhar Bindal · 8 months, 3 weeks ago

Hey should we start with mechanics?Log in to reply

– Swapnil Das · 8 months, 3 weeks ago

Exactly. I am seriously impatient.Log in to reply

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. – Jyotisman Das · 10 months, 1 week ago

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– Ayush Agarwal · 10 months, 1 week ago

You're in 10th? Boards?Log in to reply

– Jyotisman Das · 10 months ago

Sorry. I meant Eleventh Final Exams.Log in to reply

Aryan invites @Archit Agrawal @Somyaneel Sinha @Jyotisman Das @Abhineet Nayyar @Zerocool 141 @Anirban Mandal – Rajdeep Dhingra · 10 months, 1 week ago

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– Aryan Goyat · 10 months, 1 week ago

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

– Rajdeep Dhingra · 10 months, 1 week ago

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

– Aryan Goyat · 10 months, 1 week ago

ok it`s fine then i would change the date declared.Log in to reply

--------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 it`s more than clear now. What is "W-work done" if anyone could define and on what factors does it depend? – Aryan Goyat · 10 months, 3 weeks agoLog in to reply

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– Prakhar Bindal · 10 months, 3 weeks ago

But i want more people to participate not only just 2 peopleLog in to reply

--------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 ) – Aryan Goyat · 10 months, 3 weeks agoLog in to reply

– Prakhar Bindal · 10 months, 3 weeks 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 restLog in to reply

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.

– Aryan Goyat · 10 months, 3 weeks agoLog in to reply

– Prakhar Bindal · 10 months, 3 weeks 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 = 0Log in to reply

– Aryan Goyat · 10 months, 3 weeks 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.Log in to reply

– Prakhar Bindal · 10 months, 3 weeks 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 tooLog in to reply

– Aryan Goyat · 10 months, 3 weeks ago

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

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 – Prakhar Bindal · 10 months, 3 weeks ago

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– Aryan Goyat · 10 months, 3 weeks ago

thanks for the explanation and the link.Log in to reply

– Prakhar Bindal · 10 months, 3 weeks ago

Hey will internal energy decrease in case A. If its correct then will add an explanationLog in to reply

– Aryan Goyat · 10 months, 3 weeks ago

internal energy will decrease.Log in to reply

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. – Prakhar Bindal · 10 months, 3 weeks ago

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– Prakhar Bindal · 10 months, 3 weeks ago

Oh brilliant! +1!Log in to reply

– Aryan Goyat · 10 months, 3 weeks 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.Log in to reply

What is difference between internal energy of ice and water(both at same temperature ie O degree celcius)? – Aryan Goyat · 10 months, 3 weeks ago

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– Aryan Goyat · 10 months, 3 weeks ago

case A or BLog in to reply

– Prakhar Bindal · 10 months, 3 weeks ago

Its A SorryLog in to reply

– Prakhar Bindal · 10 months, 3 weeks 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 shotLog in to reply

– Prakhar Bindal · 10 months, 3 weeks ago

I Will Analyze And Report !Log in to reply

– Aryan Goyat · 10 months, 3 weeks 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.Log in to reply

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' – Aryan Goyat · 8 months, 3 weeks ago

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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. – Somyaneel Sinha · 10 months, 1 week ago

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