Determine the maximum number of 50-lb packages that can be placed on the belt without caus...

Determine the maximum number of 50-lb packages that can be placed on the belt without causing the belt to slip at the drive wheel A, which is rotating with a constant angular velocity. Wheel B is free to rotate. Also, find the corresponding torsional moment M that must be supplied to wheel A. The conveyor belt is pre-tensioned with the 300-lb horizontal force. The coefficient of kinetic friction between the belt and platform P is μk = 0.2, and the coefficient of static friction between the belt and the rim of each wheel is μs = 0.35.