The weight and radius of friction disk A are WA = 12 lb and rA = 6 in.; the weight and radius of friction disk B are WB = 6 lb and rB = 4 in. The disks are at rest when a couple M of moment 7.5 lb ?? in. is applied to disk A. Assuming that no slipping occurs between the disks, determine

(a) The angular acceleration of each disk,

(b) The friction force that disk A exerts on disk B.

Transcribed Image Text:

M A B