The ends of two fixed rods A and B are each made in the form of a single threaded screw of mean radius 0.3 in. and pitch 0.1 in. Rod A has a right handed thread and rod B a left-handed thread. The coefficient of static friction between the rods and the threaded sleeve is 0.12. Determine the magnitude of the couple that must be applied to the sleeve in order to draw the rods closer together.

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500 I 500 Ib