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NEET 2010 (AIPMT, Prelims) · Rotational Kinematics & Dynamics

Rotational Kinematics & Dynamics question from NEET 2010 (AIPMT, Prelims)

Q76NEET 2010 · AIPMT · PRELIMSMedium

Rotational Kinematics & Dynamics

A gramophone record is revolving with an angular velocity $\omega$ . A coin is placed at a distance r from the centre of the record. The static coefficient of friction is $\mu$ . The coin will revolve with the record if

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Answer: (c)

Static friction supplies the centripetal force: $m\omega^2 r \le \mu m g$ .
So $r \le \dfrac{\mu g}{\omega^2}$ .
So the answer is (c) $r \leq \dfrac{\mu g}{\omega^2}$ .

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