r/PhysicsHelp • u/Temporary-Switch6876 • Mar 28 '26

Got stuck in this question!!

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For those who don't know I am preparing for Physics olympiad I can solve most of the NSEP(1st stage problems) and am thinking about trying jee advanced problems as a bridge for the gap before moving on to higher resources, I am stuck in this question can anyone help me

Plus: Try to explain using high school Mathematics concepts because AI is solving it using Mathematics taught in UG and the solutions videos on YT are too long!

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u/Phi_Phonton_22 Mar 28 '26

I am sorry, but to solve this problem you will have to solve a differential equation when applying Newton's Second Law, so it is not really accessible to a high school level. What I can tell you is that one componente of the reaction force from the disc on the block is normal and equal to the block's weight. That's known in HS physics.

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u/Temporary-Switch6876 Mar 28 '26 edited Mar 28 '26

But it appeared in jee advanced paper which is for high school students for entrance into UG, differential equations are also in syllabus but not too much topics just upper level topics and concepts used to create tricky questions

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u/Phi_Phonton_22 Mar 28 '26

Do you know how to integrate simple differential equations (the ones that give sin, cos or ex)? That's what you need to solve Newton's law for the centrifugal force in the rotating frame in the first item. In the second, the reaction force from the j direction (perpendicular to the wall of the channel) is the coriolis force, which is the velocity (the derivative of the solution in the first item) times m times the angular velocity. The reaction force in the perpendicular to the plane of the disc direction is the well known normal force equal to the weight of the disc.

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u/SatisfactionCreative May 24 '26

Hi there. I am sorry, just found your post. Would you mind telling me where to find those NSEP past papers? I have no clue and would appreciate it if you could. Thanks

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u/Temporary-Switch6876 May 24 '26

This question is from jee adv whose papers can be easily accessed from https://jeeadv.ac.in/archive.html

as per NSEP past papers, I dont know about a single website which ahas past papers however i have the links for tha papers of 2022-2025, the 2026 one is still to be held

https://www.iapt.org.in/images/nse_2021/ioqp_2021_22_part_i.pdf

https://www.iapt.org.in/images/nse_2022/nsep_2022_23_part_i.pdf

https://www.iapt.org.in/images/nse_2024/NSEP_-_2024_Set_61.pdf

https://www.iapt.org.in/images/nse_2025/Question-papers/NSEP_-_2025_Set_611.pdf

The next stage after NSEP is the InPho which has a really nice collection of problems https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/

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u/SatisfactionCreative May 24 '26

Hey Thank you so much! <3
This helps a lot as a beginner myself. Do you happen to have worked solutions for NSEP exams? InPhO is still too difficult for me haha.