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 "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.

Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

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`bold` or `__bold__`	bold
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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

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.

aryan goyat - 5 years, 3 months ago

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

Rajdeep Dhingra - 5 years, 3 months ago

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

Swapnil Das - 5 years, 1 month 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!

Ayush Agarwal - 5 years, 3 months 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.

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – new questions coming up?

Ayush Agarwal - 5 years, 3 months ago

Thanks for inviting me. Can we recommence?

Swapnil Das - 5 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 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 - 5 years, 3 months 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

Prakhar Bindal - 5 years, 3 months 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.

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – 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

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – 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.

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – 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

Prakhar Bindal - 5 years, 3 months ago

@Aryan Goyat – 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

Prakhar Bindal - 5 years, 3 months ago

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

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – 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

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – thanks for the explanation and the link.

aryan goyat - 5 years, 3 months ago

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

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – case A or B

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – Its A Sorry

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – internal energy will decrease.

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – 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.

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – 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

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – Oh brilliant! +1!

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – 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.

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – i don`t 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)?

aryan goyat - 5 years, 3 months ago

@Aryan Goyat – I Will Analyze And Report !

Prakhar Bindal - 5 years, 3 months ago

@Prakhar Bindal – 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.

aryan goyat - 5 years, 3 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 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 - 5 years, 3 months ago

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

Prakhar Bindal - 5 years, 3 months 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?

aryan goyat - 5 years, 3 months ago

Aryan invites @Archit Agrawal @Somyaneel Sinha @Jyotisman Das @Abhineet Nayyar @Zerocool 141 @Anirban Mandal

Rajdeep Dhingra - 5 years, 3 months 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.

aryan goyat - 5 years, 3 months ago

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

Rajdeep Dhingra - 5 years, 3 months ago

@Rajdeep Dhingra – ok it`s fine then i would change the date declared.

aryan goyat - 5 years, 3 months 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.

Jyotisman Das - 5 years, 3 months ago

You're in 10th? Boards?

Ayush Agarwal - 5 years, 3 months ago

Sorry. I meant Eleventh Final Exams.

Jyotisman Das - 5 years, 3 months ago

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

Rajdeep Dhingra - 5 years, 1 month ago

Exactly. I am seriously impatient.

Swapnil Das - 5 years, 1 month ago

now only.

aryan goyat - 5 years, 1 month ago

Hey should we start with mechanics?

Prakhar Bindal - 5 years, 1 month ago

please choose a topic for discussion.

aryan goyat - 5 years, 1 month ago

Mechanics!

Prakhar Bindal - 5 years, 1 month ago

I Invite @Aniket Sanghi Too

Prakhar Bindal - 5 years, 1 month ago

Discussion is here or somewhere else

Aniket Sanghi - 5 years, 1 month ago

On Slack.

Rajdeep Dhingra - 5 years, 1 month ago

@Rajdeep Dhingra – how to open it?? i am unable to open

Aniket Sanghi - 5 years, 1 month ago

@Aniket Sanghi – go to click here. Login by entering your email and all.

Rajdeep Dhingra - 5 years, 1 month 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.

Rajdeep Dhingra - 5 years, 1 month ago

@aryan goyat @Gauri shankar Mishra @Jyotisman Das @Ayush Agarwal @Aniket Sanghi @Somyaneel Sinha @Archit Agrawal @Anirban Mandal @Shiv Agrawal

Rajdeep Dhingra - 5 years, 1 month 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.

Rajdeep Dhingra - 5 years, 1 month ago

@Rajdeep Dhingra – I am in too!!

neelesh vij - 5 years, 1 month ago

@Rajdeep Dhingra – i have joined

aryan goyat - 5 years, 1 month ago

@Aryan Goyat – I have added you.

Rajdeep Dhingra - 5 years, 1 month ago

@Rajdeep Dhingra – Which channel

Aniket Sanghi - 5 years, 1 month ago

@Aniket Sanghi –

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

Rajdeep Dhingra - 5 years, 1 month ago

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

aryan goyat - 5 years, 1 month ago

@Aryan Goyat – I saw. I was working on it. Thanks

Rajdeep Dhingra - 5 years, 1 month ago

I have joined it.

Archit Agrawal - 5 years, 1 month ago

aaj aa raha hai.

aryan goyat - 5 years, 1 month ago

I have added you in the channel.

Rajdeep Dhingra - 5 years, 1 month 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

aryan goyat - 5 years, 1 month ago

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

aryan goyat - 5 years, 1 month ago

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

Gauri shankar Mishra - 5 years, 1 month ago

different for different states.

Rajdeep Dhingra - 5 years, 1 month ago

U know for UP

Gauri shankar Mishra - 5 years, 1 month ago

@puneet manglaPlease give some advice for NSEP. Also what is the name of your book ?

Rajdeep Dhingra - 5 years, 1 month ago

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

aryan goyat - 5 years, 1 month ago

Ok guys lets start with Level 2 one i mean INPHO.Check out my newest post .

aryan goyat - 4 years, 5 months ago

You qualified NSEP? What were your marks?

Swapnil Das - 4 years, 5 months ago

170 something just qualified :P.

aryan goyat - 4 years, 5 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.

Somyaneel Sinha - 5 years, 3 months 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'

aryan goyat - 5 years, 1 month ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$