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

Question

You hold 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 1.65 kg and the distance between the elbow jint and the ba in your hand is 2d-27.5 om. Your biceps exerts an upward force of 15.0 N on the forearm and is attached at a distance of d 2.80cm from the elbow Mg (a) Using the elbow joint as the axis of rotation, determine the magnitude of the net torque acting about the ebow due to the forearm, hand, and ball. Which forces cause clockwise and counterclockwise torques about the elbow? See if you can write a relationship that will allow you to determine the magnitude of the torque if you know the magnitude of the force producing the torque, the magnitude of the displacement vector that locates the point of application of the force and the angle between the direction of these bwo vectors. See if you can use this torque relationship to determine the total dleckwise torque, the total counterclockwise torque and then the net torque about the elbow. Don't forget to use standerd sign conventien for the clockwise and counterclockwise torque when adding them to determine the net torque. N-m

Explanation / Answer

2L = 27.5 cm, L = 13.75 cm

Magnitude = M g L + (mg * 2 L) - F d

= (1.65 * 9.81 * 13.75 * 10-2) + (1.80 * 27.5 * 10-2) - (15 * 2.80 * 10-2)

magnitude of the net torque acting about elbow = 2.30 N.m

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