The vise is used to grip the pipe. If a horizontal force F1 is applied perpendicular to the end of the handle of length l, determine the compressive force F developed in the pipe. The square threads have a mean diameter d and a lead a. How much force must be applied perpendicular to the handle to loosen the vise?

Given:

F1 = 25 lb

d = 1.5 in

μs = 0.3

L = 10 in

a = 0.2 in

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L.