Q2) A bar (mass 50 kg and length 2 m) initially hangs at rest on a hinge A.
 At some point a force P = 200 N exerted on the rope (that over one smooth bar at C slides) and in the center B of the bar hangs.
 The distance d is 1.2 m.

Requested: 
(a) The angular acceleration of the bar 
(b) The magnitude of the reaction force at A.

A C P