The standard man in the figure below holds with his left arm vertically a dumbbell of mass M = 5,471 g with the intention to do concentration curls. For the position shown, we consider the following four major forces: the weight of the arm and the tension in the shoulder. This tension is primarily due to the deltoid muscle and several ligaments which run across the interface between the trunk and the arm. The weight of the dumbbell and the force pulling down the fist are equal in magnitude and are directed in the same direction. Calculate the ratio of the tension in the shoulder to the force which pulls down the fist.
2 answers
You will find the answer in the figure below
5471
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