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More Angular motion

  1. Jun 19, 2007 #1
    1. The problem statement, all variables and given/known data

    A fan increases in speed from 500 to 700rev/sec in 30 seconds. What is the average angular acceleration during that time?

    2. Relevant equations

    3. The attempt at a solution

    The answer i get for this one is

    ∝=(700-500 rev⁄sec)/3sec

    any input appreciated
  2. jcsd
  3. Jun 19, 2007 #2


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    well, same problem again.

    1. the angular acceleration has the units of rad/s^2
    2. how many rad is 200 rev?
  4. Jun 19, 2007 #3
    sorry i have given the wrong answer for you to look at, the correct answer (one i have) should have read:

    =418.9 rad⁄s^2
  5. Jun 19, 2007 #4


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    200 * 2pi / 30 = 41.89 ............
  6. Jun 19, 2007 #5
    hi, just noticed that i had a misprint in my original question above (sorry about this) in the question it says 30 secs whereas it should read 3.0 secs.
    therefore would my original answer be the correct one (sorry)
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