A bodybuilder holds a dumbbell of weight as in Figure
Chapter 9, Problem 9.71(choose chapter or problem)
A bodybuilder holds a dumbbell of weight as in Figure 9.8a. His arm is horizontal and weighs Wa 31.0 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force that the deltoid muscle can supply has a magnitude of 1840 N. Figure 9.8b shows the distances that locate where the various forces act on the arm. What is the weight of the heaviest dumbbell that can be held, and what are the horizontal and vertical force components, and , that the shoulder joint applies to the left end of the arm?
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