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04-21-2008, 11:04 AM
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| Physics???
An instructor stands at rest in the center of a platform that can rotate without friction. He then begins to swings a 2kg point mass around his head at the end of a 0.8m long string. The mass completes one revolution every 3s, and the instructor and the platform have a moment of inertia of 0.5kg-m2. Find the total kinetic energy in the instructor-platform-2kg mass system when the mass is rotating. A) 20JB) 40C) 10D) 30E) 50      |
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