The masses of the boxes are mA = 15 kg and mB = 60 kg. The coefficient of static friction...

The masses of the boxes are mA = 15 kg and mB = 60 kg. The coefficient of static friction between boxes A and B and between box B and the inclined surface is 0.12. The pulley has a radius of 60 mm and is mounted on a shaft of 10-mm 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?