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A woman lifts a 7.2-kg barbell in each hand with her arm in a horizontal position...

A woman lifts a 7.2-kg barbell in each hand with her arm in a horizontal position at the side of her body and holds it there for 3 s. The deltoid attaches 13 cm from the shoulder joint and makes a 13∘ angle with the humerus. The barbell in her hand is 0.55 m from the shoulder joint, and the center of mass of her 4.0-kg arm is 0.24 m from the joint.

Determine the magnitude of the force that the lifter's shoulder joint exerts on her humerus.

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Answer #1

Here we apply concept of rotational equilibrium and apply conditions for rotational equilibrium.

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