Find the force exerted by the biceps muscle in holding a 1-L milk carton with we

Question

Find the force exerted by the biceps muscle in holding a 1-L milk carton with weight Wm = 10.2 N with the forearm parallel to the floor. Assume that the hand is 35.0 cm from the elbow and that the upper arm is La = 35.5 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 30.0 cm from the elbow. The weight of the forearm and empty hand is Wa = 15.9 N and the center of gravity of the forearm is at a distance of 16.5 cm from the elbow.

Explanation / Answer

Fb will have two component on horizontal and other parallel,

so angle of Fb with horizontal = tan^-1(35.5/5) = 81.98 degree

now net torque on hand must be zero so:

(Fbsin(81.98))*5 = 16.5*15.9 + 10.2*35

get Fb from here

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