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 1.85 kg and the distance between the elbow joint and the ball in your hand is 2L = 25.0 cm. Your biceps exerts an upward force of 15.0 N on the forearm and is attached at a distace of d = 3.00 cm from the elbow.

I can't get the right answer.

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 1.85 kg and the distance between the elbow joint and the ball in your hand is 2L = 25.0 cm. Your biceps exerts an upward force of 15.0 N on the forearm and is attached at a distace of d = 3.00 cm from the elbow. Using the elbow joint as the axis of rotation, determine the magnitude of the net torque acting about the elbow due to the forearm, hand, and ball.

Explanation / Answer

magnitude of the net torque = Mg*L + mg*2L - F*d

= 1.85*9.8*12.5*10^-2 + 1.80*0.25 - 15*0.03

=2.266 Nm

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