If each box weighs 150 lb, determine the least horizontal force P that the man must exert
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If each box weighs 150 lb, determine the least horizontal force P that the man must exert on the top box in order to cause motion. The coefficient of static friction between the boxes is ?s = 0.65, and the coefficient of static friction between the box and the floor is ??s = 0.35.
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-3 t 4.5 ft 5 ft 4.5 ft
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