. Force to Hold a Baseball A person holds a 1.42-N baseball in his hand, a dista

Question

. Force to Hold a Baseball A person holds a 1.42-N baseball in his hand, a distance of 34.0 cm from the elbow s, attached at a distance of 2.75 cm from the elbow, exerts an upward force of 12.6 N on the forearm. Consider the forearm and hand to be a uniform rod with a mass of 1.20 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? Humerus- Biceps 12.6 N Radius 1 Ulna 2.75 cm 17.0 cm Mg 17.0 cm

Explanation / Answer

Given,

w = 1.42 N ; d = 34 cm ; x = 2.75 cm ; Fu = 12.6 N ; M = 1.2 kg

a)Net Torque will be given by:

Tau(net) = 1.42 x 0.34 - 12.6 x 0.0275 + 1.2 x 9.8 x 0.17 = 2.14 N-m

Hence, Tau = 2.14 N-m

b)The forearm will rotate in clockwise direction, if the net torque is nonzero.

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