Question

A person with their upper arm vertical and their forearm horizontal holds a 4.5-kg iron cannon ball as shown in the figure below. Assume the mass of the forearm and hand is 1.5 kg, with a center of mass 15 cm from the elbow. The center of the cannonball is 32 cm from the elbow, and the force of the biceps is applied 5.0 cm from the elbow. What force is exerted by the bicep? Elbow contact point 4.5 kg Cannonball Biceps Center of mass 5.0 cm 15 cm 32 cmm
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Answer #1

Taking moment of all the forces about the elbow

F x 15 = 1.5 x 9.8 x 15 + 4.5 x 9.8 x 32

Force, F = 108.78 N

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