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Homework Help: Circular motion of a ball and string

  1. Oct 28, 2008 #1
    1. The problem statement, all variables and given/known data
    A ball on the end of a string is whirled around in a horizontal circle of radius 0.366 m. The plane of the circle is 1.50 m above the ground. The string breaks and the ball lands 2.20 m (horizontally) away from the point on the ground directly beneath the ball's location when the string breaks. Find the radial acceleration of the ball during its circular motion.

    2. Relevant equations
    a = v^2/r
    T = 2pi(r)/v

    3. The attempt at a solution
    I know the radial acceleration is towards the center of the circle
    what i do not understand is that they do not give me time or velocity.
    so how i figure it out!?

    am i supposed to be assuming something?
  2. jcsd
  3. Oct 28, 2008 #2
    You gota calculate velocity using kinematics.
  4. Oct 28, 2008 #3
    o kinematics

    but that would require something like d = .5at^2 rite?
  5. Oct 28, 2008 #4
    Basicly just treat it as a projectile motion question to get intial velocity then that initial V is your velocity for the circular motion.
  6. Oct 29, 2008 #5
    well if im to treat it as a projectile motion question

    that does not really help me figure out initial velocity...im sorry
    im just really confused
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