Determine the minimum coefficient of static friction between the disk and the surface in...

Determine the minimum coefficient of static friction between the disk and the surface in Prob. 17-114 so that the disk will roll without slipping. Neglect the mass of the pulleys.

Prob. 17-114:

The 20-kg disk A is attached to the 10-kg block B using the cable and pulley system shown. If the disk rolls without slipping, determine its angular acceleration and the acceleration of the block when they are released. Also, what is the tension in the cable? Neglect the mass of the pulleys.