Can ring ?
A fixed thin vertical rod passes through a uniform ring of radius r = 2/3 m . The ring is pulled aside and held touching the rod at a point on its inner surface . Now the ring is suddenly pushed horizontally to rotate about the rod stably without sliding down . Find the angular velocity of the ring .The coefficient of friction between the ring and the rod is 0.75 and acceleration due to gravity is 10 m/s^2.