A Man in a Gym Is Holding an 8

question 67

Multiple Choice

A man in a gym is holding an 8.0-kg weight at arm's length,a distance of 0.55 m from his shoulder joint.What is the torque about his shoulder joint due to the weight if his arm is held at 30° below the horizontal?

• A)22 N ∙ m
• B)2.2 N ∙ m
• C)4.4 N ∙ m
• D)13 N ∙ m
• E)37 N ∙ m

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Definitions:

Hyperextension

An excessive extension of a limb or joint beyond its normal range of motion, often leading to injury.

Lateral Excursion

The side-to-side movement of the mandible, which is important in the grinding motion of chewing.

Plantar Flexion

The action of reducing the angle between the bottom of the foot and the back of the leg, similar to when the toes are pointed.

Dorsiflexion

The action of raising the foot upwards towards the shin, decreasing the angle between the dorsum of the foot and the leg.