The mean diameter of a square-threaded jackscrew is 1.80 in. The pitch of the thread is 0.40 in. and the coefficient of static friction is 0.20.
(a) Calculate the force that must be applied at the end of an 18-in.-long jack handle to raise a load of 5000 lb.
(b) Calculate the force required (if any) on the handle to start the load down.
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