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 1.20 kg . If the biceps is connected to the forearm a distance ^biceps = 3.50 cm from the elbow, how much force d biceps must the biceps exert to hold a 500 g ball at the end of the forearm at distance d ball = 32.0 cm from the elbow, with the forearm parallel to the floor? How much force F elbow must the elbow exert? What is the horizontal distance forearm between the elbow and the point where the weight of the forearm acts? Express your answer in meters.

Explanation / Answer

"the horizontal distance d of forearm between the elbow and the point where the weight of the forearm acts

d = L/2 = 32/2 = 16 cm = 0.160 m

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