In the figure below, the deltoid and subscapularis muscles work as a force couple to abduct the arm at the shoulder. If the deltoid acts 15 cm (d1) below the shoulder at an 80° angle above the left horizontal axis, and a subscapularis muscle force of 240 N acts 5.5 cm (d2) above the shoulder at a 20° angle below the right horizontal axis, determine the magnitude of the deltoid muscle force. Assume that: 1) the arm is "static" in this position, 2) the moment created by the weight of the arm is 15.2 N•m and 3) that the muscle attachment points are directly above and below the joint axis. Deltoid d2 20° di 80 Subscap

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