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Centripetal Acceleration Problem HELP

  1. Nov 12, 2007 #1
    I dont know what I'm doing wrong on this one...

    What is the centripetal acceleration of a point on the perimeter of a bicycle wheel of diameter 70cm when the bike is moving 7.0m/s.

    isn't centripetal acceleration just v^2 / r?

    I get 140m/s^2, but the answer is 180m/s^2
  2. jcsd
  3. Nov 12, 2007 #2
    did you convert 70 cm into metres? And also 70 cm is the diametre, to get the radius you hve to divide the Diametre by 2..
  4. Nov 12, 2007 #3
    yea i did. .35 = radius 7=velocity 7^2/.35 = 140m/s^2
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