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Ball on a pendulum question

  1. May 9, 2009 #1
    1. The problem statement, all variables and given/known data
    A 2 kg ball on a 3 meter long string swings along patch ABC. Angle AOB and AOC equal 30* each. Find the acceleration of the ball at point A.

    5uhett.jpg

    2. Relevant equations
    Guesses: F=ma, v = vo + at

    3. The attempt at a solution

    I tried using tan30 = X/2.6 and solving for X to find the horizontal distance. Then, draw a FBD and mg = 20 and the other leg is X, which would allow me to solve for the hypotenuse. But I realized that I cannot add a force with a distance.
     
  2. jcsd
  3. May 9, 2009 #2
    Hint:
    tangential acceleration in point A,since there is no radial acceleration cause V=0(ar=V^2/R)
    Goodluck.
    Edit:
    hint number 2
    find the angle of the component of the force mg in the tangential direction using trigo(height ,Length)
     
  4. May 9, 2009 #3
    hi,

    how do i do that, i tried to see if the triangles were similar but no luck
     
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