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the locking pin P. Calculate the angular acceleration a of the frame A if the locking pin is (a) in place and (b) withdrawn. Neglect all friction and the mass of the frame.

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P M 200 mm B A 250 mm- C