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To develop muscle tone, a woman lifts a 2.00-kg weight
Chapter 4, Problem 30PE(choose chapter or problem)
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 \(60.0^\circ\). (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 \(\mathrm{0.250~kg \cdot m^2}\), 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?
Questions & Answers
QUESTION:
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 \(60.0^\circ\). (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 \(\mathrm{0.250~kg \cdot m^2}\), 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?
ANSWER:Step-by-step solution Step 1 o f 10 (a) The net torque acting on the elbow joint is given as, Here, is the torque due to the force exerted by the biceps and is the torque on the elbow joint due to weight in the forearm.