maximum force?

Question

Consider an individual who can exert a maximum force F=65 lb to the test strap shown in the figure. If the test strap is located a distance s=11 in from the elbow and the biceps muscle attaches a distance of a=2 in from the elbow, what is the magnitude of the force Fb (in lb) exerted by the bicep?

Answer 1

Since the diagram isn't shown, I will assume that the arm is pulling up on the strap, so the moment of inertia of the strap is
-11*65 in-lb
and the bicep is
2*fb
so

fb=11*65/2 lb

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