The mass of the slender bar is m and the mass of the homogeneous disk is 4m. The system is...

The mass of the slender bar is m and the mass of the homogeneous disk is 4m. The system is released from rest in the position shown. If the disk rolls and the friction between the bar and the horizontal surface is negligible, show that the disk’s angular acceleration is α = 6g/95R counterclockwise.