JEE Main 2011 — Rotational Motion Question with Solution
From: AIEEE 2011
Question
A mass hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass and radius Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass if the string does not slip on the pulley, is:
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
This is the free body diagram of pulley and mass
For translation motion of the block,
For rotational motion of the pulley,
where angular acceleration of disc =
and (For circular disc)
Solving &
For translation motion of the block,
For rotational motion of the pulley,
where angular acceleration of disc =
and (For circular disc)
Solving &
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This is a previous-year question from JEE Main 2011, 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.