Each uniform box on the stack of four boxes has a weight of 8 lb. the stack is being tra...

Each uniform box on the stack of four boxes has a weight of 8 lb. the stack is being transported on the dolly, which has a weight of 30 lb. determine the maximum force F which the woman can exert on the handle in the direction shown so that no box on the stack will tip or slip. The coefficient of the static friction at all points of contact is . the dolly wheels are free to roll. Neglect their mass.