For the rod described in Problem 4-25, what must the diameter be if only 2.0 deg of twist is desired when 40 lb-ft of torque is applied?
Problem
A steel rod with a length of 8.0 ft and a diameter of 0.625 in is used as a long wrench to unscrew a plug at the bottom of a pool of water. If it requires 40 lb-ft of torque to loosen the plug, compute the angle of twist of the rod.
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