A turnbuckle, used to adjust the length or tension of a bar or cable, is threaded at both ends. Rotating it draws threaded ends of the bar or cable together or moves them apart. Suppose that the pitch of the threads is p = 0.05 in, their mean radius is r = 0.25 in, and the coefficient of static friction between the threads and the mating grooves is 0.24. If T = 200 lb, what couple must be exerted on the turnbuckle to start tightening it ?
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