Is this done properly, please help

  1. Sep 25, 2009 #1
    The blades of a fan rotate clockwise at −225 rad/s at medium speed, and −355 rad/s at high speed. If it takes 3.05 seconds to get from medium to high speed, what is the average angular acceleration of the fan blades during this time?

    Is the answer


    = 42.6 rad/s^2

    Please work it out and tell me if I did this correctly
  2. jcsd
  3. Sep 25, 2009 #2


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    Hi Ion1776! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    Yup, that's fine! :biggrin:

    (apart from the sign)

    the usual constant acceleration equations apply to angular distance speed and acceleration just as they do to linear distance speed and acceleration …

    in this case, you can (and did) use v - u = at. :smile:
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