The weights of the boxes are WA = 65 lb and WB = 130 lb. The coefficient of static frictio...

The weights of the boxes are WA = 65 lb and WB = 130 lb. The coefficient of static friction between boxes A and B and between box B and the floor is 0.12. The pulley has a radius of 4 in and is mounted on a shaft of 0.8-in radius. The coefficient of static friction between the pulley and shaft is 0.16. What is the largest force F for which the boxes will not slip?