A horizontal platform in the shape of a circular disk rotates in a horizontal plane about a frictionless vertical axle as shown in the figure below. The platform has a mass M = 100 kg and a radius R = 2.0 m. A student whose mass is m = 60 kg walks slowly from the rim of the disk toward its center. If the angular speed of the system is 2.0 rad/s when the student is at the rim, what is the angular speed when he has reached a point r = 0.50 m from the center? (Hint: use angular momentum conservation) Answer: 4.1 rad/s

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Chapter1: Units, Trigonometry. And Vectors
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A horizontal platform in the shape of a circular disk rotates in a horizontal plane about a frictionless vertical axle as shown in the figure below. The platform has a mass M = 100 kg and a radius R = 2.0 m. A student whose mass is m = 60 kg walks slowly from the rim of the disk toward its center. If the angular speed of the system is 2.0 rad/s when the student is at the rim, what is the angular speed when he has reached a point r = 0.50 m from the center? (Hint: use angular momentum conservation) Answer: 4.1 rad/s

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