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Rotation Problem

  1. Mar 13, 2013 #1
    1. The problem statement, all variables and given/known data
    A merry - go - round rotates clockwise 15 times in 45 seconds. By rubbing against its edge, a child stop it from turning in 15 seconds.

    a) find its initial angular velocity (ω)
    b) find its angular acceleration ([itex]\alpha[/itex])


    3. The attempt at a solution

    15 times in 45 seconds means:

    in 1 second it makes 1/3 of a revolution

    thus in 3 seconds it make on complete revolution

    im not sure if im going in the right direction but Angular Velocity is in radians per second.

    Am i on the right track? Do i just take the reciprocal of my answer? Please help
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 13, 2013 #2

    TSny

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    You found that it makes 1/3 revolution per second. Can you convert 1/3 revolution to radians?
     
  4. Mar 13, 2013 #3
    2/3 pi radians?
     
  5. Mar 13, 2013 #4

    TSny

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    Yes.
     
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