The disk A rolls without slipping on a horizontal surface. End B of bar BC is pinned to th...

The disk A rolls without slipping on a horizontal surface. End B of bar BC is pinned to the edge of the disk A, and end C of the bar BC can slide freely along the horizontal surface. In addition, bar BC is pushed by the force P = mg at its left end. The mass of bar BC is mBC, and the mass of the disk A is mA. The system is initially at rest.

Figure P7.57

Determine the acceleration of the center of disk A and the angular acceleration of bar BC immediately after force P is applied if mBC = m and the mass of the disk mA is negligible.