While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The moment of inertia of the lower leg is 0.900 kg m², the muscle force is 1490 N, and its effective perpendicular lever arm is 3.45 cm. Find the magnitude of the angular acceleration a of the weight. 9.9 rad/s? How much work W is done if the leg rotates through an angle of 25.0° with a constant force exerted by the muscle? W = 7.21 Question Credit: OpenStax College Physics
While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The moment of inertia of the lower leg is 0.900 kg m², the muscle force is 1490 N, and its effective perpendicular lever arm is 3.45 cm. Find the magnitude of the angular acceleration a of the weight. 9.9 rad/s? How much work W is done if the leg rotates through an angle of 25.0° with a constant force exerted by the muscle? W = 7.21 Question Credit: OpenStax College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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![While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the
muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The
moment of inertia of the lower leg is 0.900 kg m², the muscle force is 1490 N, and its effective perpendicular lever arm is
3.45 cm. Find the magnitude of the angular acceleration a of the weight.
9.9
rad/s?
How much work W is done if the leg rotates through an angle of 25.0° with a constant force exerted by the muscle?
W = 7.21
Question Credit: OpenStax College Physics](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4b04860c-c0c8-43e2-a6d6-1d247a89f8ac%2Fd4580950-2ea1-4001-b9a4-24b0ae7f90a3%2Fmkshof.png&w=3840&q=75)
Transcribed Image Text:While exercising in a fitness center, a man lies face down on a bench and lifts a weight with one lower leg by contracting the
muscles in the back of the upper leg. The weight has mass 13.5 kg, and is a distance of 28.0 cm from the knee joint. The
moment of inertia of the lower leg is 0.900 kg m², the muscle force is 1490 N, and its effective perpendicular lever arm is
3.45 cm. Find the magnitude of the angular acceleration a of the weight.
9.9
rad/s?
How much work W is done if the leg rotates through an angle of 25.0° with a constant force exerted by the muscle?
W = 7.21
Question Credit: OpenStax College Physics
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