Rotation About a fixed Axis

$1-$ A $25-kg$ circular disk of uniform thickness rotates in a vertical plane about a frictionless pin at point $A$ as shown. In the position shown $($the diameter through pin $A$ is vertical$),$ the angular velocity of the disk is $20ra\frac{d}{s}$ counterclockwise and the magnitude of the couple $C$ is $50Nm.$ At this instant, determine the angular acceleration of the disk and the horizontal and vertical component of the force exerted on the disk by the pin at support $A.\{33\mathrm{.}3ra\frac{d}{s^2},166\mathrm{.}7(N),1755(N)\}$