Consider $($Figure $1).$ The cord is attached to the $42-$lb block, and the coefficients of static friction are ${}_B=0\mathrm{.}2$ and ${}_D=0\mathrm{.}3$

Part A

Determine the smallest couple moment which can be applied to the $28-lb$ wheel that will cause impending motion. Express your answer in pound$-$feet to three significant figures.

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$1$ of $1$