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Non-rotating uniform disk of mass

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A uniform disk of mass 3M and radius R is rotating on a frictionless axis about its center with initial angular velocity of magnitude ω0. A non-rotating uniform disk of mass M and the same radius R is dropped directly on top of the spinning mass 3M. Because of friction, the two masses quickly start spinning together and achieve the same final magnitude angular velocity ωf. What is ωf?

Reference no: EM131365143

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