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Mathematics 8 Online
OpenStudy (anonymous):

A DVD is approximately 12 cm in diameter. Then drive motor of the DVD player is controlled to rotate precisely between 200-500 revolutions per minute, depending on what track is being read. a) find an interval for the angular speed of a disc as it rotates. b) Find the linear speed of a point on the outermost track as the disc rotates. I know the answers (a=400pi - 1000pi, b=6000pi) but I am clueless on how to get them. Please help.

OpenStudy (perl):

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