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
r = $\mu $g$\omega $2
r < ${{{\omega ^2}} \over {\mu g}}$
$r \le {{\mu g} \over {{\omega ^2}}}$
$r \ge {{\mu g} \over {{\omega ^2}}}$
Solution
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