# Kinematics. Newtons Laws

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A standard man does reverse curls in a gym. He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 127 kg, what is the tension in each of his shoulders? Consider the weight of the arm and the weight of the bar. Note: Use 4.9kg as the mass of the arm of the standard man.

• Kinematics. Newtons Laws -

Take a look at this video and see what you think.

Stresses will be higher when the bar is decelerating, but they probably want you to ignore that.

Assume each shoulder supports half the weight of the barbell, plus the arm's own weight.

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