A man stands on a platform that is rotating (without friction) with an angular speed of 0.721 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central axis is 7.14 kg-m². If by moving the bricks the man decreases the rotational inertia of the system to 1.04 kg-m², (a) what is the resulting angular speed of the platform and (b) what is the ratio of the new kinetic energy of the system to the original kinetic energy? (a) Number (b) Number THE 4.949 Units rad/s Units No units

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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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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A man stands on a platform that is rotating (without friction) with an angular speed of 0.721 rev/s;
his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system
consisting of the man, bricks, and platform about the central axis is 7.14 kg-m2. If by moving the
bricks the man decreases the rotational inertia of the system to 1.04 kg-m², (a) what is the resulting
angular speed of the platform and (b) what is the ratio of the new kinetic energy of the system to
the original kinetic energy?
(a) Number
(b) Number
THE
4.949
Units
rad/s
Units No units
Transcribed Image Text:A man stands on a platform that is rotating (without friction) with an angular speed of 0.721 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central axis is 7.14 kg-m2. If by moving the bricks the man decreases the rotational inertia of the system to 1.04 kg-m², (a) what is the resulting angular speed of the platform and (b) what is the ratio of the new kinetic energy of the system to the original kinetic energy? (a) Number (b) Number THE 4.949 Units rad/s Units No units
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