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Homework Help: Circular motion: ring on string

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

    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


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    2017 Award

    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


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    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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