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Homework Help: Finding angular acceleration from deceleration

  1. Apr 10, 2013 #1
    a-c are correct but I dont know how to find part d.

    d)when turned off, it decelerates to a stop in 39s. What is its average angular acceleration during this time?

    I treated this part as part c to just find angular acceleration like normal.
    371.75 rad/s / 39s=9.51 rad/s^2.
    should it be negative because it decelerates?

    Attached Files:

  2. jcsd
  3. Apr 10, 2013 #2

    Angular acceleration is defined as (change in angular speed)/(change in time). The speed goes from 371 rad/s to 0, that gives you a negative number.
  4. Apr 10, 2013 #3
    Oh wow. Thanks!
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