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Physics help please!!!

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The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be constant, what is the angular acceleration (in rad/s2) of such a DVD?

  • Physics help please!!! - ,

    angular acceleration= (wf-wi)/timeinseconds

    change rpm to rad/sec

    570rpm*2PIrad/rev*1min/60sec.

  • Physics help please!!! - ,

    so 570rpm*2pirad = 3581.415625
    i divide that with rev*1min/60 sec == 59.69 is that correct ??

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