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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 26 July 2022, Shift 1, Physics Q52

Question 52 of 90 in this shift, Physics question 22 of 30, Section B.

A disc of mass 1 kg and radius R is free to rotate about a horizontal axis passing through its centre and perpendicular to the plane of disc. A body of same mass as that of disc is fixed at the highest point of the disc. Now the system is released, when the body comes to the lowest position, its angular speed will be 4x3R rad s−14\sqrt{\frac{x}{3R}}\ \mathrm{rad\ s^{-1}} where x=x = __________. (g=10 ms−2g = 10\ \mathrm{ms^{-2}})

Official answer

5

NTA final key.

Chapter
System of Particles and Rotational Motion
Topic
Moment of Inertia
Idea tested
MOI of Discrete Particles

Same idea in other shifts

Asked 5× in all
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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.