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A disk of diameter 80.0cm and mass 50.0g is free to rotate about its center and...

A disk of diameter 80.0cm and mass 50.0g is free to rotate about its center and initially at rest. A lab mouse of mass 30.0g is carefully placed on the edge of the disk at rest. The mouse starts running around at the edge of the disk at a speed of 20.0cm/s relative to the ground. 1) How fast, in rpm, is the disk rotating now? 2) What is the total kinetic energy of the system?

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