JEE Main 2019 — Rotational Motion Question with Solution
From: JEE Main 2019 (Online) 10th January Evening Slot
Question
A rigid massless rod of length 3l has two masses attached at each end as shown in the figure. The rod is pivoted at point P on the horizontal axis (see figure). When released from initial horizontal position, its
instantaneous angular acceleration will be -
This question includes a diagram. The text above accompanies the figure.
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Applying torque equation about point P.
2M0 (2l) 5 M0 gl = I
I = 2M0 (2l)2 + 5M0 l2 = 13 M0l2d
= =
= anticlockwise
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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.