Question

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a radius of 4.64 m and a rotational inertia of 141 kg·m2 about the axis of rotation. A 53.2 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 1.48 rad/s when the student starts at the rim, what is the angular speed when she is 0.738 m from the center?


Chapter 11, Problem 058 A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a radius of 4.64 m and a rotational inertia of 141 kg-m2 about the axis of rotation. A 53.2 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 1.48 rad/s when the student starts at the rim, what is the angular speed when she is 0.738 m from the center?

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