You hold a 1.80-N softba n your hand as shown in the figure. Consider your forea

Question

You hold a 1.80-N softba n your hand as shown in the figure. Consider your forearm and hand to be a uniform rod with a mass of n your hand is 2L 31.5 cm. Your biceps exerts an upward force of 13.5 N on the forearm and is attached at a distance of d 1.50 kg and the distance between the elbow joint and the bal 2.00 cm from the elbow. (a) 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 bal 1.819 Which forces cause clockwise and counterclockwise torques about the elbow? See if you can write a relationship that wi 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 two vectors. See if you can use this torque relationship to determine the total clockwise torque, the total counterclockwise torque and then the net torque about the elbow. Don't forget to use standard sign convention for the clockwise and counterclockwise torque when adding them to determine the net torque (b) In which direction will the forearm and hand rotate, if the net torque obtained in part (a s nonzero? no rotatio clockwise counterclockwise

Explanation / Answer

Torque about the elbow= (Force exerted by biceps x distance to the joint)-(weight of ball x L)-(weight of the forearm x L)

=(13.5 N x 0.02 m)-(1.80N x (15.75x10-2cm))-((1.5kg x9.8 m/s2)x(15.75 x 10-2 cm))

=-2.328 N.m

It is a clockwise torque

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