a) How much force must be produced by the biceps brachii, attaching at 90 degree

Question

a) How much force must be produced by the biceps brachii, attaching at 90 degrees to the radius at 3 cm from the center of rotation at the elbow joint, to support the weight of 70N at a distance of 30 cm from the elbow joint? (neglect the weight of the forearm and hand)

by the biceps brachli, ttaching at 90 degrees to the How much force must be produced by the biceps brachi, attaching at 90 degrees to the radius at 3 cm from the center of rotation at the elbow joint, to support the weight of 70N at a distance of 30 cm from the elbow joint? (neglect the weight of the forearm and hand) 90 30 cm

Explanation / Answer

The net torque at elbow is zero

T_e = 0

net torque _e = Fm dm - wt* d wt

0= ( Fm)( 0.03 m) - 70 N ( 0.30 m)

Fm = 70 N ( 0.30 m)/0.03 m

Fm = 700 N

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