Each of the two drums and connected hubs of 12-in. radius weighs 200 lb and has a radius of gyration about its center of 35 in. calculate the magnitude of the angular acceleration of each drum. friction in each bearing is negligible.

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.