Hold your upper arm vertical and your lower arm horizontal with your hand palm-d

Question

Hold your upper arm vertical and your lower arm horizontal with your hand palm-down on a table, as shown in (Figure 1) . If you now push down on the table, you'll feel that your triceps muscle has contracted and is trying to pivot your lower arm about the elbow joint. If a person with the arm dimensions shown pushes down hard with a 90 N force, what force must the triceps muscle provide? Ignore the mass of the arm and hand in your calculation. Express your answer to two significant figures and include the appropriate units. F=

Explanation / Answer

By the sum of torques

Fr = Fr

(90)(.3) = F(.024)

F = 1100 N

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