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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.

Note by Aryan Goyat
9 months, 2 weeks 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. Aryan Goyat · 9 months, 2 weeks ago

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@Aryan Goyat Hey , All your mentions are wasted. Even I didn't receive mine. I wanted this thing badly. Let's get started. Rajdeep Dhingra · 9 months ago

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@Aryan Goyat I would like you to keep the topics related to circuits and electrodynamics. Swapnil Das · 7 months, 3 weeks ago

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@Aryan Goyat Thanks for inviting me. Can we recommence? Swapnil Das · 7 months, 3 weeks ago

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@Aryan Goyat 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 · 9 months ago

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@Ayush Agarwal 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 · 9 months ago

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@Aryan Goyat new questions coming up? Ayush Agarwal · 9 months ago

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@puneet manglaPlease give some advice for NSEP. Also what is the name of your book ? Rajdeep Dhingra · 7 months, 1 week ago

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@Rajdeep Dhingra i know him its just a title and the ques are from different CPP,books and class problem . Aryan Goyat · 7 months, 1 week ago

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Can someone please tell me the cuttoff of nsep which was held on 22 november !!!!! Gauri shankar Mishra · 7 months, 1 week ago

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@Gauri shankar Mishra different for different states. Rajdeep Dhingra · 7 months, 1 week ago

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@Rajdeep Dhingra U know for UP Gauri shankar Mishra · 7 months, 1 week ago

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here is my 3rd problem 'can you do it in 3 minutes' Aryan Goyat · 7 months, 2 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 · 7 months, 2 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 · 7 months, 2 weeks ago

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@Rajdeep Dhingra I have joined it. Archit Agrawal · 7 months, 2 weeks ago

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@Archit Agrawal I have added you in the channel. Rajdeep Dhingra · 7 months, 2 weeks ago

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@Archit Agrawal aaj aa raha hai. Aryan Goyat · 7 months, 2 weeks ago

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@Rajdeep Dhingra 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 · 7 months, 2 weeks ago

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@Rajdeep Dhingra Which channel Aniket Sanghi · 7 months, 2 weeks ago

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@Aniket Sanghi

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

Rajdeep Dhingra · 7 months, 2 weeks ago

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@Rajdeep Dhingra i have posted the very first ques for practice of mechanics NSEP titled elliptical cage though its little mathematical. Aryan Goyat · 7 months, 2 weeks ago

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@Aryan Goyat I saw. I was working on it. Thanks Rajdeep Dhingra · 7 months, 2 weeks ago

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@Rajdeep Dhingra i have joined Aryan Goyat · 7 months, 2 weeks ago

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@Aryan Goyat I have added you. Rajdeep Dhingra · 7 months, 2 weeks ago

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@Rajdeep Dhingra I am in too!! Neelesh Vij · 7 months, 2 weeks ago

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Comment deleted 7 months ago

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@Aryan Goyat Firstly i think we should fix a time each day for discussion otherwise only few people will participate Prakhar Bindal · 7 months, 2 weeks ago

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@Prakhar Bindal great then 1-3pm tommorow Aryan Goyat · 7 months, 2 weeks ago

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@Aryan Goyat so please invite all mentioning time. Prakhar Bindal · 7 months, 2 weeks ago

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I Invite @Aniket Sanghi Too Prakhar Bindal · 7 months, 2 weeks ago

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@Prakhar Bindal Discussion is here or somewhere else Aniket Sanghi · 7 months, 2 weeks ago

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@Aniket Sanghi On Slack. Rajdeep Dhingra · 7 months, 2 weeks ago

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@Rajdeep Dhingra how to open it?? i am unable to open Aniket Sanghi · 7 months, 2 weeks ago

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@Aniket Sanghi go to click here. Login by entering your email and all. Rajdeep Dhingra · 7 months, 2 weeks ago

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please choose a topic for discussion. Aryan Goyat · 7 months, 2 weeks ago

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@Aryan Goyat Mechanics! Prakhar Bindal · 7 months, 2 weeks ago

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When are we starting. We should start @aryan goyat @Gauri shankar Mishra @Anirban Mandal Rajdeep Dhingra · 7 months, 2 weeks ago

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@Rajdeep Dhingra now only. Aryan Goyat · 7 months, 2 weeks ago

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@Aryan Goyat Hey should we start with mechanics? Prakhar Bindal · 7 months, 2 weeks ago

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@Rajdeep Dhingra Exactly. I am seriously impatient. Swapnil Das · 7 months, 2 weeks ago

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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 · 9 months ago

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@Jyotisman Das You're in 10th? Boards? Ayush Agarwal · 8 months, 4 weeks ago

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@Ayush Agarwal Sorry. I meant Eleventh Final Exams. Jyotisman Das · 8 months, 4 weeks ago

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@Rajdeep Dhingra 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 · 9 months ago

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@Aryan Goyat Most people have exams currently. 21st March is mostly end date for people's exams. We'll start then. Rajdeep Dhingra · 9 months ago

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@Rajdeep Dhingra ok it`s fine then i would change the date declared. Aryan Goyat · 9 months ago

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--------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 · 9 months, 2 weeks ago

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@Aryan Goyat 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 · 9 months, 1 week ago

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@Aryan Goyat But i want more people to participate not only just 2 people Prakhar Bindal · 9 months, 2 weeks ago

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--------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 · 9 months, 2 weeks ago

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@Aryan Goyat 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 · 9 months, 2 weeks ago

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@Prakhar Bindal 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 · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@Prakhar Bindal thanks for this insight , but may you please list all the other factors in real gas case. Aryan Goyat · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@Prakhar Bindal thanks for the explanation and the link. Aryan Goyat · 9 months, 2 weeks ago

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@Aryan Goyat Hey will internal energy decrease in case A. If its correct then will add an explanation Prakhar Bindal · 9 months, 2 weeks ago

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@Prakhar Bindal internal energy will decrease. Aryan Goyat · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@Aryan Goyat Oh brilliant! +1! Prakhar Bindal · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@Prakhar Bindal case A or B Aryan Goyat · 9 months, 2 weeks ago

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@Aryan Goyat Its A Sorry Prakhar Bindal · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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@Aryan Goyat I Will Analyze And Report ! Prakhar Bindal · 9 months, 2 weeks ago

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@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 · 9 months, 2 weeks ago

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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 · 7 months, 2 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 · 9 months ago

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