Disk B weighs 50 lb and has a centroidal radius of gyration of 8 in. The power unit C co...

Disk B weighs 50 lb and has a centroidal radius of gyration of 8 in. The power unit C consists of a motor M and a disk A, which is driven at a constant angular speed of 1600 rev/min. The coefficients of static and kinetic friction between the two disks are μ_s = 0.80 and μ_k = 0.60 respectively. Disk B is initially stationary when contact with disk A is established by application of the constant force P = 3 Ib. Determine the angular acceleration α of B and the time t required for B to reach its steady-state speed.