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More Circular Motion

  1. Oct 8, 2003 #1
    God, I'm getting so frustrated.

    A 0.50kg ball that is tied to the end of a 1.5m light cord is revolved in a horizontal plane with the cord making a 30 degree angle with the vertical.

    a) what is the ball's speed.

    Now, I drew my little diagram, solved for the force of tension (got 5.66N). I plug that in for my Centripetal Force in

    Centripetal Force = mv^2/r, solve for v, and got 4.1 . The book gets like, 2.1. I'm getting so frustrated right now...let me know if you can help. Thanks.
     
  2. jcsd
  3. Oct 9, 2003 #2

    HallsofIvy

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    Did you forget to take the SQUARE ROOT???
     
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