The hard disk in a laptop computer or some mp3 players


The hard disk 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?

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Physics: The hard disk in a laptop computer or some mp3 players
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