A ring of radius R is first rotated with an angular velocity omega_(0) and then carefully placed on a rough horizontal surface. The coefficient of friction between the durface and the ring is mu. Time after which its sngular speed is reduced to half is (omega_(0)R)/(xmug) where 'x' is

A ring of radius R is first rotated with an angular velocity omega_(0)

1.	A ring of radius R is first rotated with an angular velocity omega_(0) and then carefully placed on a rough horizontal surface. The coefficient of friction between the durface and the ring is mu. Time after which its sngular speed is reduced to half is (omega_(0)R)/(xmug) where 'x' is
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