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An exhaust system for a pickup truck is shown in the figure. The weights $W_h,W_m,$ and $W_t$ of the head$-$pipe, muffler, and tailpipe are $9,103,$ and $59$ N $,$ respectively, and act at the indicated points. If the exhaust$-$pipe hanger at point $A$ is adjusted so that its tensions $F_A$ is $54$ N $,$ determine the required forces in the hangers at points $B,C,$ and $D$ so that the force$-$couple system at point $O$ is zero. Why is a zero force$-$couple system at $O$ desirable?