The hard drive in a laptop computer or some MP3 players contains one or more platters (spinning disks), each having an angular speed of typically 10,000 rpm, a radius of 4.0 cm, and a mass of about 50 g. (a) What is the kinetic energy of one platter? (b) What is the angular momentum of one platter? (c) Can you notice this angular momentum when you rotate your computer or MP3 player? Explain why or why not.
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