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Calculating the speed of an object

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data
    If the radius of a merry-go-round is 11 meters, and it takes 15 seconds to go around once, what is the speed of an atom at the outer rim?

    2. Relevant equations
    C = 2 [tex]\pi[/tex] r
    v = m / s

    3. The attempt at a solution

    C = 3.14 * 22
    (gives distance traveled, 1 trip)
    Multiply by 2 (i.e. 2 trips as indicated by problem)
    divide by the time, 15s
    Answer was told to be wrong, I thought it rather simple, did I make a calculation error somewhere?
  2. jcsd
  3. Sep 22, 2009 #2


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    Homework Helper

    so what is the time period? What is the angular velocity when you get that?
  4. Sep 22, 2009 #3


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    Gold Member

    Where does it say this?
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