In the vise shown, the screw is single-threaded in the upper member; it passes through the lower member and is held by a frictionless washer. The pitch of the screw is 3 mm, its mean radius is 12 mm, and the coefficient of static friction is 0.15. Determine the magnitude P of the forces exerted by the jaws when a 60-N∙m couple is applied to the screw.

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D C 450 mm € A B 60 N-m 150 mm P -P