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To develop muscle tone, a woman lifts a 2.00-kg
weight held in her hand. She uses her biceps
muscle to flex the lower arm through an angle of
60.0°. (a) What is the angular acceleration if the
weight is 24.0 cm from the elbow joint, her
forearm has a moment of inertia of 0.250 kg
and the net force she exerts is 750 N at an
effective perpendicular lever arm of 2.00 cm? (b)
How much work does she do?
m²

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