What force does the runners hand exert on each weight at, Ask an Expert

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As part of a training program, an athlete runs while holding 9.00 {rm kg} weights in each hand. As he runs, the weights swing through a 30.0 ^circ arc in frac{1}{3} {rm s}. His hands are 72 {rm cm} from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 9.00 {rm kg} weight he is carrying.

What force does the runner's hand exert on each weight at the bottom of the swing? answer should be in newtons

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