Find the force exerted by the biceps muscle in holding a 2.50?L milk carton (wei

Question

Find the force exerted by the biceps muscle in holding a 2.50?L milk carton (weight 24.8 N) with the forearm parallel to the floor. Assume that the hand is 34.4 cm from the elbow and that the upper arm is 29.9 cm long. The elbow is bent at a right angle and one tendon of the biceps is attached to the forearm at a position 5.00 cm from the elbow, while the other tendon is attached at 29.9 cm from the elbow. The weight of the forearm and empty hand is 21.6 N and the center of gravity of the forearm is at a distance of 16.2 cm from the elbow.

Explanation / Answer

Applying law of conservation of torque at elbow point,

Tnet = Fb*0.05 - 21.6*0.162 - 24.8*0.344 = 0        => Fb= 240.6 N

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