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A man of mass m stands on the edge of a ...

A man of mass m stands on the edge of a horizontal unifom disc of mass M and radius R whichis capable of rotating freely about a stationary vertical axis passing through its center. At a certain moment the man starts moving along the edge of the disc, he shifts over angle `theta` relative to the disc and then stops. Find the angle through which the disc rotates.

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The correct Answer is:
`2mtheta//(2m+M)`
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