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 11.5 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 1470 N, and its effective perpendicular lever arm is 3.45 cm. Find the magnitude of the angular acceleration a of the weight. a = 25.9918 rad/s2 Incorrect How much work W is done if the leg rotates through an angle of 10.0° with a constant force exerted by the muscle? W = 8.1728 Incorrect 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 11.5 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 1470 N, and its effective perpendicular lever arm is 3.45 cm. Find the magnitude of the angular acceleration a of the weight. a = 25.9918 rad/s2 Incorrect How much work W is done if the leg rotates through an angle of 10.0° with a constant force exerted by the muscle? W = 8.1728 Incorrect 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

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Angular speed, acceleration and displacement

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Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.

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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 11.5 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 1470 N, and its effective perpendicular lever
arm is 3.45 cm. Find the magnitude of the angular acceleration a of the weight.
a =
25.9918
rad/s?
Incorrect
How much work W is done if the leg rotates through an angle of 10.0° with a constant force exerted by the muscle?
W =
8.1728
Incorrect
Question Credit: OpenStax College Physics
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