A circular platform is mounted on a frictionless vertical axle. Its radius is and its moment of....

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A circular platform is mounted on a frictionless vertical axle. Its radius is and its moment of inertia about the axle is . It is initially at rest. A man stands on the edge of the platform and begins to walk along the edge at the speed of relative to the ground. Time taken by the man to comblete one revolution is
(a)
(b)
(c)
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