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Centripetal Acceleration HELP

  1. Nov 13, 2007 #1
    What is the centripetal acceleration of a point on the perimeter of a bicycle wheel of diameter 70 cm when the bike is moving 7.0m/s?

    I thought the formula was v^2/r =ac

    But when I do that i get 1.4m/s^2 and it is not the right answer. Can someone tell me what I'm doing wrong, or if I've used the wrong formula? Thanks
     
  2. jcsd
  3. Nov 13, 2007 #2

    Doc Al

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    Staff: Mentor

    Realize that the diameter is given in cm. Change to meters.
     
  4. Nov 13, 2007 #3
    I did. (7m/s)^2/.35m = 140m/s
     
  5. Nov 13, 2007 #4
    Sorry that was supposed to be 1.4x10^2 in the first post
     
  6. Nov 13, 2007 #5

    Doc Al

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    Staff: Mentor

    I don't see anything wrong with that answer, assuming you gave proper units.
     
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