JEE Main 2017PhysicsRotational MotionMediumMCQ

JEE Main 2017 — Rotational Motion Question with Solution

JEE Main 2017 (02 Apr)

Question

A slender uniform rod of mass M and length l is pivoted at one end so that it can rotate in a vertical plane (see figure). There is negligible friction at the pivot. The free end is held vertically above the pivot and then released. The angular acceleration of the rod when it makes an angle θ with the vertical is:

Choose an option

Show full solutionCorrect option: B
Correct answer
B3g2lsin⁡θ

Step-by-step explanation

Moment of a force about O is lα=mgl2sinθ

⇒α=mgl2ml23sinθ

⇒α=3g2lsin⁡θ

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About this question

This is a previous-year question from JEE Main 2017, 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.