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Homework Help: Rotational Motion, angular velocity

  1. May 27, 2012 #1
    1. The problem statement, all variables and given/known data

    Two people are on a ride where the inside cars rotate at constant angular velocity three
    times the constant angular velocity of the outer cars. If the two cars are in line at t = 0,
    and moving at 3ω and ω respectively, at what time will they next pass each other?

    3. The attempt at a solution

    The answer is π/ω but I can't figure out how to get there!! Please help!!!!
  2. jcsd
  3. May 27, 2012 #2
    What variable n represent?

    Look at the clock at noon when the hour and minute hand are at top of each other. When will the next when the minute hand pass hour hand?
    Last edited: May 27, 2012
  4. May 27, 2012 #3
    I think it is "pi".
  5. May 27, 2012 #4
    thanks. Old eyes need reading glasses.
  6. May 28, 2012 #5
    Do tell us how you tried it out, its much easier to help then :smile:

    As a basic hint, think about the relative angular velocity of the two objects.
  7. May 28, 2012 #6


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    welcome to pf!

    hi jimla! welcome to pf! :wink:
    ok, now translate that into (two) equations

    what do you get? :smile:
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