The deltoidthe rounded muscle across the top of your upper
Chapter 3, Problem 3.17(choose chapter or problem)
The deltoidthe rounded muscle across the top of your upper armallows you to lift your arm away from your side. It does so by pulling on an attachment point on the humerus, the upper arm bone, at an angle of 15 with respect to the humerus. If you hold your arm at an angle 30 below horizontal, the deltoid must pull with a force of 720 N to support the weight of your arm, as shown in FIGURE 3.21a. (Youll learn in Chapter 5 that force is a vector
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