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Circular motion-find the minimum speed

  1. Oct 5, 2012 #1
    The question is:

    A ball of a mass 4kg is attached to the end of a 1.2m long string and whirled around in a circle that describes a vertical plane..what is the minimum speed that the ball can be moving at and still maintain a circular path?

    i try solve it by use T+mg=mv*2/r.But i cant find the tension...
     
  2. jcsd
  3. Oct 5, 2012 #2
    You don't need to calculate the tension. What is the condition for the "minimum speed"?
    Or what happens with T when v is less than that minimum?
     
  4. Oct 5, 2012 #3
    Can you give me the answer...because i still dont understand it..
     
  5. Oct 5, 2012 #4
    Can you give me the answer...because i still dont understand it..
     
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