show work 14. * A weight lifter holds a 5.0 kg weight out to the side with her a
ID: 1792687 • Letter: S
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14. * A weight lifter holds a 5.0 kg weight out to the side with her arm stretched out If the weight is 45 cm from the shoulder joint, and her deltoid muscle attaches to the humerus bone a distance of 5.0 cm from the shoulder joint, what force must the deltoid muscle maintain to support the weight? 15. * A particular person's arm supports a 4.50 pound load a distance of 32.0 cm from the elbow joint. If the biceps muscle attaches via a tendon to the radius bone 2.50 cm from the elbow, what force in pounds does the biceps muscle have to exert to support the load? You may assume the forearm is basically horizontal.Explanation / Answer
14] Let the force be F. By aplancing torque, F*r1 = mg*r2
F *0.05 = 5*9.8*0.45
F = 5*9.8*0.45/0.05 = 441 N answer
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