Part C

As shown, a server at a restaurant is carrying a tray that has a glass of water resting on it$.($Figure $3)$ The glass and tray exert a force with

magnitude $F_1=28\mathrm{.}5N$ on the server's hand. If $l_1=0\mathrm{.}440m,l_2=0\mathrm{.}310m,l_3=0\mathrm{.}150m,{}_1=165,$ and ${}_2=130,$ what is the moment of

force about the shoulder joint at point $A?$ Assume that moments acting in the counterclockwise direction about point A are positive whereas

moments acting in the clockwise direction are negative.

Express your answer numerically in Newton$-$meters to three significant figures.

Figure

$3$ of $3$

$M_A=$

$N*m$

Incorrect; Try Again; $4$ attempts remaining

You may have miscalculated the moment arm. Check the sign of the $x$ component of each arm segment. Does any segment extend into

the negative $x$ direction?