The double pulley shown is attached to a 0.5-in.-radius shaft which fits loosely in a fixed bearing.

Question:

The double pulley shown is attached to a 0.5-in.-radius shaft which fits loosely in a fixed bearing. Knowing that the coefficient of static friction between the shaft and the poorly lubricated bearing is 0.40, determine the magnitude of the force P required to maintain equilibrium.

4.5 in. 2.25 in. 40 Ib