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Conical Pendulum units problem

  1. Apr 16, 2005 #1
    Hello all , I encouter a problem solving this one :

    We are given a conical pendulum with : V - tan. speed of particle
    m - mass of rotating particle
    g - gravity acceleration
    L - leght of the string

    We need to find CosA , T by what is given above !!!
    A- is the angle between the string and vertical line !!!!

    So : I wrote : tcosA=mg
    tsinA=mv^2/R
    R=LsinA

    but I can't present cosA without sinA or something
    Please Help !
     
  2. jcsd
  3. Apr 16, 2005 #2

    Doc Al

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    Staff: Mentor

    That's fine. You can simplify and solve for T. Use the 3rd equation to eliminate R from the 2nd equation. Then realize that [itex]\sin^2\theta = 1 - \cos^2\theta[/itex].
     
  4. Apr 16, 2005 #3
    okay got it I get 2nd order eq.
    thanks a lot
     
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