As shown, a server at a restaurant is carrying a tray that has a glass of water resting on it. (gure 3) The glass and tray exert a force with magnitude F1 = 6.801b on the server's hand. If l1 = 1.30 ft , lg = 1.10 ft , lg = 0.500 ft , (.21 = 165 , and a2 = 120 , what is the moment of force about the shoulderjoint 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. F 13 12 a2 A K