Question

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While doing bicep curls, Tamara applies 155 Newtons of force to lift the dumbbell. Her forearm is 0.366 meters long and she begins the bicep curl with her elbow bent at a 15° angle below the horizontal, in the direction of the positive x-axis. Determine the magnitude of the torque about her elbow. (Show work)

Answer 1

54.8 N·m

Explanation:

The horizontal distance from the dumbbell to the elbow is ...

(0.366 m)cos(15°) ≈ 0.3535 m

Then the torque due to the vertical force is ...

(155 N)(0.3535 m) = 54.8 N·m