The vise shown consists of two members connected by two double-threaded screws of mean radius 6 mm and pitch 2 mm. The lower member is threaded at A and B (μs =0.35), but the upper member is not threaded. It is desired to apply two equal and opposite forces of 540 N on the blocks held between the jaws. Determine

(a) Which screw should be adjusted first?

(b) The maximum couple applied in tightening the second screw.

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в -120 mm-120 mm