In testing the design of the screw-lift jack shown, 12 turns of the handle are required to

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Question:

In testing the design of the screw-lift jack shown, 12 turns of the handle are required to elevate the lifting pad 1 in. If a force F = 10 lb applied normal to the crank is required to elevate a load L = 2700 lb, determine the efficiency e of the screw in raising the load.