In order to unscrew the tapped faucet A, a plumber uses two pipe wrenches as sho

Question

In order to unscrew the tapped faucet A, a plumber uses two pipe wrenches as shown. By exerting a 40-lb force on each wrench, at a distance of 10 in. from the axis of the pipe and in the direction perpendicular to the pipe and to the wrench, he prevents the pipe from rotating, and thus avoids loosening or further tightening the joint between the pipe and the tapped elbow at C. Determine (a) the angle that the wrench at A should form with the vertical if elbow C is not to rotate about the verticle, (b) the force-couple system at C equivalent to the two 40-lb forces when this condition is satisfied.

Explanation / Answer

sorry that i missed the b) part

soln. for part b)


the force couple system is therefore

given by Fequivalent = (40- 40 cos ) i - 40 sin j = 20 i - 34.64 j

the couple is therefore M = 15*Fv i = 519.615 lb.in

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