Homework Help: Physics help please!!!

Posted by john on Saturday, February 18, 2012 at 11:47am.

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!!! - bobpursley, Saturday, February 18, 2012 at 12:05pm
angular acceleration= (wf-wi)/timeinseconds

change rpm to rad/sec

570rpm*2PIrad/rev*1min/60sec.
Physics help please!!! - john, Saturday, February 18, 2012 at 12:28pm
so 570rpm*2pirad = 3581.415625
i divide that with rev*1min/60 sec == 59.69 is that correct ??

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