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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 dbiceps = 3.50 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 700 g ball at the end of the forearm at distance dball = 31.0 cm from the elbow, with the forearm parallel to the floor? What is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts?
Sagot :
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