The ends of two fixed rods A and B are single-threaded screws of mean radius 0.3 in. and pitch 0.1 in. Rod A has a right-handed thread, and rod B has 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 to draw the rods closer together.

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500 Ih S00 Б0 ь