How much force must be produced by the biceps muscle, attaching at an angle of 3

Question

How much force must be produced by the biceps muscle, attaching at an angle of 35° to the radius bone at 0.03 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45° from vertical (see diagram below)? The forearmhand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles).

20) How much force must be produced by the biceps muscle, attaching at an angle of 35 to the radius bone at 0.03 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45 from vertical (see diagram below)? The forearm-hand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles). 35 muscle Elbow On 45 0.03 m 0.14 m F weight 450 Hand dumbbe 0.25 m 864 N b. 1191 N c. 701 N 833 N

Explanation / Answer

Balancing moment about centre of rotation

Fbiceps musclesin35*0.03=2.9*9.8sin45*0.14+100sin45*0.25

Fbiceps muscle=1190.84N

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