When you lift an object by moving only your forearm, the main lifting muscle in

Question

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.00 kg . If the biceps is connected to the forearm a distance dbiceps = 2.50 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 650 g ball at the end of the forearm at distance dball = 33.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? (Figure 1)

What is the horizontal distance dforearmbetween the elbow and the point where the weight of the forearm acts

Explanation / Answer

Torque_elbow=1.0kg*9.81m/sec^2*.025m+.65...
=(.895Nm)+(2.751Nm)
=3.566N/m
F_elbow=Torque_elbow/arm_lenghth
=3.566N/m/.33m
=10.807N

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