Gail tries to perform a standing arm curl with a 21lb dumbbell. The arm is moving slowly enough...

Question:

Gail tries to perform a standing arm curl with a 21lb dumbbell. The arm is moving slowly enough that you can assume static equilibrium. The distance between the olecranon and the metacarpals of the hand is 0.2m. The bicep muscle has a moment arm of 0.04m from the olecranon. The biceps brachii tendon is the size of a nickel (21.21mm (0.835 in) diameter, same size cross sectional area as a nickel). The forearms are light, so we can ignore their mass for now. Using good form, the humerus stays vertical. When the angle between the humerus and the radius is at 108 degrees, how much tensile stress is placed on the biceps tendon? Answer in units of MPa (Megapascals).

Static equilibrium:

The situation of a system in which none of its states is in the motion and not its internal energy state manages to vary with the time such condition is known as the static equilibrium condition.

Answer and Explanation:


Given data:

  • Dumbbell: {eq}W = 21\;{\rm{lb}} {/eq}
  • Distance between the hands: {eq}d = 0.2\;{\rm{m}} {/eq}
  • Biceps muscle moment: {eq}m =...

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What is Static Pressure? - Definition & Formula

from Introduction to Engineering

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