The hand clamp is constructed using a square-threaded screw having a mean diameter of 36 mm, a

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The hand clamp is constructed using a square-threaded screw having a mean diameter of 36 mm, a lead of 4 mm, and a coefficient of static friction at the screw of μs = 0.3. If the clamping force in the board AB is 300 N, determine the reversed force -F that must be applied perpendicular to the handle in order to loosen the screw.

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