A differential band brake is used to control the speed of a drum which rotates at a constant speed. Knowing that the coefficient of kinetic friction between the belt and the drum is 0.30 and that a couple of magnitude 125 lb ⋅ft is applied to the drum, determine the corresponding magnitude of the force P that is exerted on end D of the lever when the drum is rotating
(a) Clockwise,
(b) Counterclockwise

Transcribed Image Text:

r=7 in. 30 75 in 15 in. 30 2 in.