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Homework Help: Number of revolutions a disk has made after a given time

  1. Mar 8, 2010 #1
    1. A computer hard disk starts from rest, then speeds up with angular acceleration of 218 rad/s^2 until it reaches its final angular speed of 6660rpm. How many revolutions has the disk made 10.1s after it starts up?

    3. The attempt at a solution.
    I have no idea how to find the number of revolutions in the time given with what appers to be a changing acceleration rate. I am unsure what is going on or how to solve this problem. Please help!
  2. jcsd
  3. Mar 8, 2010 #2

    this is a constant angular acceleration problem. does that help? It has that constant acceleration until it reaches that speed, and after that, the acceleration equals zero.
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