Chapter 8: Problem 83
Force to Hold a Baseball A person holds a \(1.42-\mathrm{N}\) baseball in his hand, a distance of \(34.0 \mathrm{~cm}\) from the elbow joint, as shown in Figure \(8.30\). The biceps, attached at a distance of \(2.75 \mathrm{~cm}\) from the elbow, exerts an upward force of \(12.6 \mathrm{~N}\) on the forearm. Consider the forearm and hand to be a uniform rod with a mass of \(1.20 \mathrm{~kg}\). (a) Calculate the net torque acting on the forearm and hand. Use the elbow joint as the axis of rotation. (b) If the net torque obtained in part (a) is nonzero, in which direction will the forearm and hand rotate?
Short Answer
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Key Concepts
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