JEE Main 2019 — Rotational Motion Question with Solution
From: JEE Main 2019 (Online) 9th January Morning Slot
Question
An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If AB = BC, and the angle made by AB with downward vertical is , thrown :
This question includes a diagram. The text above accompanies the figure.
Choose an option
Show full solutionCorrect option: D
Correct answer
Dtan =
Step-by-step explanation
Assume mass of each part = m
Here,
C1R = C1A(sin)
= sin
BY = Lsin
As By = MP
MP = Lsin
= cos
C2M = BC2cos
C2M =
C2P = C2M MP = Lsin
Now balancing torque about hinge paint A,
mg(C1R) = mg(C2P)
mg = mg
= sin
=
tan =
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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.