A 10-kg uniform disk is placed in contact with an inclined surface and a constant 11 N · m...

A 10-kg uniform disk is placed in contact with an inclined surface and a constant 11 N · m couple M is applied as shown. The weight of the link AB is negligible. Knowing that the coefficient of kinetic friction at D is 0.4, determine (a) the angular acceleration of the disk, (b) the force in the link AB.