The solid cylindrical rotor B has a mass of 43 kg and is mounted on its central axis C-C...

The solid cylindrical rotor B has a mass of 43 kg and is mounted on its central axis C-C. The frame A rotates about the fixed vertical axis O-O under the applied torque M = 30 N·m. The rotor may be unlocked from the frame by withdrawing the locking pin P. Calculate the angular acceleration of the frame A if the locking pin is (a) in place and (b) withdrawn. Neglect all friction and the mass of the frame.