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Homework Help: Circular Motion

  1. Feb 21, 2006 #1
    An object of mass 4.0 kg is whirled in a horizontal circle
    of radius 0.40 m with a constant speed. If the tension in
    the wire is 80 N, a=20 m/s, v= 2.83m/s, T= 0.89 s find:
    d the number of revolutions made every minute.
     
  2. jcsd
  3. Feb 21, 2006 #2

    cepheid

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  4. Feb 21, 2006 #3
    With the datum about [tex]T[/tex] you gave, I think there's no need for other data to find the revolutions per minute.
     
  5. Feb 21, 2006 #4
    yes i have attemted the questions from part a,b,c
    but i can't figure what formulae to use to find the number of revolution
     
  6. Feb 21, 2006 #5

    cepheid

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    k, but did you read what phuncv87, or whatever...:p said?

    You have the period? What is that? The period of time required for one full revolution to occur. If you know that, can you tell me how often a revolution occurs in one second? What is that? The frequency. Yeah you can, because you know the amount of time needed for one revolution (period), and that's a simple relationship. Give it a shot and let us know how it goes. :smile:
     
  7. Feb 21, 2006 #6
    oh i c, you use T=1/f then times it by 60secs
    Thank you for your help
     
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