Find the force exerted by the biceps muscle when the angle is 135° and the forearm is in a downward

Find the force exerted by the biceps muscle when the angle is 135° and the forearm is in a downward position. (assume that r1 = 3.0 cm, r2 = 20 cm, r3 = 36 cm, ma = 2.0 kg, and mb = 4.4 kg. enter the magnitude.)

Asked on July 25, 2017 in Physics.
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