A plumber exerts the two forces shown to loosen a pipe.(a) What total moment does he exert...

A plumber exerts the two forces shown to loosen a pipe.

(a) What total moment does he exert about the axis of the pipe?

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(b) If you represent the two forces by a force F acting at O and a couple M, what are F and M?

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(c) If you represent the two forces by a wrench consisting of the force F and a parallel couple Mp, what is Mp, and where does the line of action of F intersect the x-y plane?