A $2\mathrm{.}0-1$b 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:

$M_A=($

i$+$

i

$j+$

k$)$ lb$-$in$.$

$M_{AB}=1$

i$+$

i

j$+$

k$)$ Ib$-$in$.$