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

Q: 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

c The coin will revolve with the record, if Force of friction $ \ge $ centrifugal force $\mu mg \ge mr{\omega ^2}$ or$\,\,\,r \le \frac{{\mu g}}{{{\omega ^2}}}$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

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

A$r=\mu g{\omega ^2}$
B$r < \frac{{{\omega ^2}}}{{\mu {\rm{g}}}}$
C$r \le \frac{{\mu {\rm{g}}}}{{{\omega ^2}}}$
D$r \ge \frac{{\mu {\rm{g}}}}{{{\omega ^2}}}$

AIPMT 2010, Medium

STD 11 Science
NEET
STD 11 - 4.2. friction
Physics

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