Problem 8.14 Part A Hold your upper arm vertical and your lower arm horizontal w

Question

Problem 8.14 Part A 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 = Value Units

Explanation / Answer

By the sum of torques

Fr = Fr

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

F = 1100 N

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