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Circular motion time/radius ratio question

  1. Dec 29, 2011 #1
    1. The problem statement, all variables and given/known data
    16. A car completes a horizontal circle of radius r in time T. The same car then completes a larger horizontal circle of radius 2r in half the time. What is the ratio of the centripetal acceleration ac for the car in the second circle to that in the first circle a c2 a c1?


    3. The attempt at a solution
    iv never understood the whole ratio thing
    i got (4pi^2*4R)/(T^2/4)
    the answer is suppose 2 be 8:1 so i assume the second car is the 8

    Ithink i got it actually (4pi^2*2R)/(T^2/4):(4pi^2*R)/T^2
    that 8:1 did i do it right?
     
    Last edited: Dec 29, 2011
  2. jcsd
  3. Dec 29, 2011 #2
    also why isn't there anyone on flash chat?
     
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