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A compressive force of 670 N is to be applied to the two boards in the grip of the C-clamp. The threaded screw has

 

A compressive force of 670 N is to be applied to the two boards in the grip of the C-clamp. The threaded screw has a mean diameter of 13 mm and advances 2.4 mm per turn. The coefficient of static friction is 0.34. Determine the force F which must be applied normal to the handle at C in order to (a) tighten and (b) loosen the clamp. Neglect friction at point A. Answers: (a) F = i (b) F= Mi N N 111 B CO 160 mm

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