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Circular motion: ring on string

  1. Jan 12, 2017 #1
    1. The problem statement, all variables and given/known data
    4c84ed5f4c844877969b916c48f467f0.jpg



    2. Relevant equations
    F = mw^2r



    3. The attempt at a solution
    For part a, I cant get the constant of half with the tan a
    I am getting tan a = w^2l/g
     
  2. jcsd
  3. Jan 12, 2017 #2

    BvU

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    Science Advisor
    Homework Helper
    Gold Member

    Post your work. What force do you use to compensate ##mg## ?
     
  4. Jan 12, 2017 #3

    Doc Al

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    Staff: Mentor

    Show how you got that.
     
  5. Jan 12, 2017 #4
    Think carefully what is the total force acting in the y-axis on the ring. Its not ##T\cos{a}-mg## as you probably think. It is rather ##T(1+\cos{a})-mg## (why??)
     
  6. Jan 14, 2017 #5
    I did it thanks guys
     
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