To determine the force a person’s triceps muscle can exert, a doctor uses the procedure sh...

To determine the force a person’s triceps muscle can exert, a doctor uses the procedure shown in, where the patient pushes down with the palm of his hand on a force meter. Given that the weight of the lower arm is Mg = 15.6 N, and that the force meter reads F = 89.0 N, what is the force Fr exerted vertically upward by the triceps?

FIGURE