The uniform slender 2-kg bar BD is attached to the uniform 6-kg uniform disk by a pin at B...

The uniform slender 2-kg bar BD is attached to the uniform 6-kg uniform disk by a pin at B and released from rest in the potion shown. Assuming that the disk rolls without slipping, determine (a) the initial reaction at the contact point A, (b) the corresponding smallest allowable value of the coefficient of static friction.