A block of weight W is pulled up a plane forming an angle with the horizontal by a force
Chapter 10, Problem 10.49(choose chapter or problem)
A block of weight W is pulled up a plane forming an angle with the horizontal by a force P directed along the plane. If is the coefficient of friction between the block and the plane, derive an expression for the mechanical efficiency of the system. Show that the mechanical efficiency cannot exceed 1 2 if the block is to remain in place when the force P is removed.
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