JEE Main 2019 — Rotational Motion Question with Solution
JEE Main 2019 (09 Apr Shift 1)
Question
A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of , where is the angle by which it has rotated, is given as . If its moment of inertia is then the angular acceleration of the disc is:
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Kinetic Energy
Differentiate both side w.r.t. .
Differentiate both side w.r.t. .
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This is a previous-year question from JEE Main 2019, covering the Rotational Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.