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

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Physics

A woman lifts a 7.2-kg barbell in each hand with her arm in ahorizontal position at the side of her body and holds it there for3 s. The deltoid attaches 13 cm from the shoulder joint and makes a13∘ angle with the humerus. The barbell in her hand is 0.55 m fromthe shoulder joint, and the center of mass of her 4.0-kg arm is0.24 m from the joint.

1. Determine the magnitude of the force that the lifter'sshoulder joint exerts on her humerus. Express your answer with theappropriate units.

2. Determine the direction of the force (measured clockwise fromthe positive x-axis) that the lifter's shoulder joint exerts on herhumerus. Express your answer with the appropriate units.

I already found the force the deltoid exerts on the humerus(with help) but I am not sure how to even set up these problems.Any help is great, thank you!

Answer & Explanation Solved by verified expert
4.1 Ratings (444 Votes)
b Angle is Tan12611607 9225o with    See Answer
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