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A $2\mathrm{.}0-$lb force $F$ is applied to the knob of the window$-$opener mechanism when the crank $BC$ is horizontal. Determine the moment of

the force about point A and about line $AB($report both answers as vectors$).$

Assume $a=2\mathrm{.}3$ in$.,b=3\mathrm{.}1$ in$.,c=1\mathrm{.}1$ in$.,$ and $=40.$

Answers:

$M_A=1$

$i+$

$j+$

$k$

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