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Exam #1 Bonus Homework Max Points: 10Pts Due: Monday, March 4, 2013 1) A woman is holding an 8-lb weight in her hand with the entire arm held...

I am not so sure about how to do the first problem in the attachment

Exam #1 Bonus Homework Max Points: 10Pts Due: Monday, March 4, 2013 1) A woman is holding an 8-lb weight in her hand with the entire arm held horizontally as shown in Figure 1 . A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder join O ; this force acts at the 21 angle shown. Determine: a. The force exerted by the deltoid muscle on the upper arm at A b. The x- and y- components of the force reaction at the shoulder joint O The weight of the upper arm is W U = 4.1-lb, the weight of the lower arm is W L = 2.4-lb and the weight of the hand is W H = 0.9lb; All these weights act at the locations shown in the figure. Figure 1: Problem #1 2) A rectangular sign over a store has a mass of 100-kg, with the center of mass in the center of the rectangle. The support against the wall at point C may be treated as a ball-and-socket joint. At corner D , support is provided in the y -direction only. Calculate: a. The tensions T 1 and T 2 in the supporting wires b. The total force supported at C c. The lateral force R supported at D
Figure 2: Problem #2

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