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Rotational Motion

Q- A light cylindrical axle of radius r is free to rotate about its vertical axis. The upper end of the axle is attached to a light horizontal cross bar with two small masses, each M, at a distance R from the axle. A light string is wrapped on the axle and its free end is passing over a smooth light pulley and mass m is hanging through it. Find the ratio of tensions in the string and the cross bar as a function of time after the mass is released.  


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