<p>As shown, a server at a restaurant is carrying a tray that has a glass of wat

Question

<p>As shown, a server at a restaurant is carrying a tray that has a glass of water resting on it. The glass and tray exert a force with magnitude F1 = 26.5N on the server's hand. If l1 = 0.441m, l2 = 0.304 , l3 = 0.091m, &#945;1 = 145, and &#945;2&#160;= 100, 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.</p>
<p><img src="http://session.masteringengineering.com/problemAsset/1174171/2/1108610_003.jpg" alt="1108610_003.jpg" /></p>

Explanation / Answer

Unfortunately your question has no diagram to match so excuse me if this method is inappropriate. First, recall the formula moment = force x distance Now, do an inventory of all the forces, noting down which ones will cause a clockwise moment, and which ones will cause an anticlockwise moment. Having done that, take moments about the shoulder joint keeping in mind which moments are positive and which are negative. To decide this, you can choose to take the clockwise direction as positive thus the anticlockwise will be negative. Just remember, if you choose clockwise as positive add it each time and subtract negative moments (anticlockwise) until you have arrived at your answer. Good luck!

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