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 1.30 kgkg . If the biceps is connected to the forearm a distance dbicepsdbicepsd_biceps = 3.50 cmcm from the elbow, how much force FbicepsFbicepsF_biceps must the biceps exert to hold a 600 gg ball at the end of the forearm at distance dballdballd_ball = 33.0 cmcm from the elbow, with the forearm parallel to the floor? How much force FelbowFelbowF_elbow must the elbow exert? Although it is uncommon, orthopedic surgeons have seen patients who have torn their biceps tendon when forces of greater than 390 NN have been exerted on the tendon with the arm bent at the elbow so that the forearm is parallel to the ground. What is the minimum mass of a ball MballMballM_ball such a patient might have held to cause the biceps tendon to tear?
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 1.30 kgkg . If the biceps is connected to the forearm a distance dbicepsdbicepsd_biceps = 3.50 cmcm from the elbow, how much force FbicepsFbicepsF_biceps must the biceps exert to hold a 600 gg ball at the end of the forearm at distance dballdballd_ball = 33.0 cmcm from the elbow, with the forearm parallel to the floor? How much force FelbowFelbowF_elbow must the elbow exert? Although it is uncommon, orthopedic surgeons have seen patients who have torn their biceps tendon when forces of greater than 390 NN have been exerted on the tendon with the arm bent at the elbow so that the forearm is parallel to the ground. What is the minimum mass of a ball MballMballM_ball such a patient might have held to cause the biceps tendon to tear?
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