You hold a 1.80-N softball in your hand as shown in the figure. Consider your fo

Question

You hold a 1.80-N softball in your hand as shown in the figure. Consider your forearm and hand to be a uniform rod with a mass of 1.60 kg and the distance between the elbow joint and the ball in your hand is

You hold a 1.80-N softball in your hand as shown in the figure. Consider your forearm and hand to be a uniform rod with a mass of 1.60 kg and the distance between the elbow joint and the ball in your hand is 2L = 31.0 cm. Your biceps exerts an upward force of 14.0 N on the forearm and is attached at a distance of d = 2.20 cm from the elbow.

Explanation / Answer

Torque due to ball = (1.8 * 0.31 ) (-k^)

Torque due to biceps = (0.022 * 14 ) k^

torque due to mass of hand = (1.60*9.8 * 0.155 ) (-k^)

so ...

net torque = (1.8 * 0.31 ) - (0.022 * 14 ) + (1.60*9.8 * 0.155 ) = 2.6804Nm (-k^ ) ... i

magnitude = 2.6804N-m

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