Correct

Correct answer is shown. Your answer $-3\mathrm{.}4N*m$ was either rounded differently or used a different number of significant figures than required for this part.

ning Goal:

iderstand the concept of moment of a force and to calculate it using a scalar formulation.

magnitude of the moment of a force with a nitude $F$ around a point $O$ is defined as follows:

$M_O=Fd$

$3$ of $3$

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 $F_1=13\mathrm{.}0N$ on the server's hand. If $l_1=0\mathrm{.}410m,l_2=0\mathrm{.}320m,l_3=0\mathrm{.}170m,{}_1=165,$ 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.

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