Problem

If each box weighs 150 lb, determine the least horizontal force P that the man must exert...

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 μs = 0.5, and the coefficient of static friction between the box and the floor is μ’s = 0.2.

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