When you lift an object by moving only your forearm, the main lifting muscle in

Question

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.20kg . If the biceps is connected to the forearm a distance dbiceps = 3.50cmfrom the elbow, how much force Fbiceps must the biceps exert to hold a 750g ball at the end of the forearm at distance dball = 34.0cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? (Figure 1)

What is the magnitude of the force exerted by the biceps Fbiceps? What is the magnitude of the force exerted by the elbow Felbow?

Explanation / Answer

i) Sum the moments about the elbow:
0.75kg * 9.8m/s

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