A horizontal circular platform rotates counterclockwise about its axis at the ra

Question

A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.957 rad/s. Bob, with a mass of 75.0 kg, walks clockwise around the platform along its edge at the speed of 1.09 m/s with respect to the platform. His 20.1-kg cat also walks clockwise around the platform, but along a circle at half the platform's radius and at half of Bob's linear speed with respect to the platform. Jane's 18.9-kg dog, on the other hand, sits still on the platform at a position that is 3/4 of the platform's radius from the center. Model the platform as a uniform disk with mass 91.7 kg and radius 1.97 m. Calculate the total angular momentum of the system.

Explanation / Answer

A horizontal circular platform rotates counterclockwise about its axis at the ra

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