A student stands at the center of a frictionless piano stool. The student is holding two...

 

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A student stands at the center of a frictionless piano stool. The student is holding two dumbbells in his hands and is rotating at an angular speed wo. When he pulls the dumbbells into his chest, his angular speed increases by a factor c = 2.57. By what factor does his kinetic energy change? A student stands at the center of a frictionless piano stool. The student is holding two dumbbells in his hands and is rotating at an angular speed wo. When he pulls the dumbbells into his chest, his angular speed increases by a factor c = 2.57. By what factor does his kinetic energy change?