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Rigid rotation problem.

  1. Mar 30, 2010 #1
    1. The problem statement, all variables and given/known data
    A bicycle wheel has an angular acceleration of 1.4 rad/s^2. If a point on its rim has a tangential acceleration of 49 cm/s^2, what is the radius of the wheel?
    Answer in units of m.


    2. Relevant equations

    ac=r*a

    3. The attempt at a solution

    49 cm/s^2=.49m/s^2
    r=ac/a=2.8571

    But the answer is wrong, where did I mess up?
     
  2. jcsd
  3. Mar 30, 2010 #2

    ehild

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    Just to make things clear, what is ac and what is a?

    ehild
     
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