Although it is uncommon, orthopedic surgeons have seen patients who have torn th

Question

Although it is uncommon, orthopedic surgeons have seen patients who have torn their biceps tendon when forces of greater than 390 N 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 such a patient might have held to cause the biceps tendon to tear?
Please show ALL work!

If this helps, at equilibrium:

Fbiceps?(Felbow+gmball+gmforearm)

dbicepsFbiceps?mforearmg(12dball)?mballgdball

Fbiceps?(Felbow+gmball+gmforearm)

Explanation / Answer

mmass of the ball*g=F

we can find the mass, we know F

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