8.14 - Enhanced Problem 8.14 - Enhanced - with Feedback Part A Hold your upper a

Question

8.14 - Enhanced

Problem 8.14 - Enhanced - with Feedback 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. You may want to review( F= Value Units Figure 1 of 1 Submit My Answers Give Up Triceps Provide Feedback Continue 30 cm 2.4 cm

Explanation / Answer

Applying equilibrium condition , which states that the sum of moments about any point must be zero.

At Elbow , sum of moments must be zero .

i.e. T×(2.4 cm)-(90 N)(30 cm) =0

T = (90×30)/2.4

= 1125 N

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