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What is the centripetal acceleration?

  1. Oct 31, 2011 #1
    1. The problem statement, all variables and given/known data

    If a ball is being twirled in a circle with a radius of 0.5m, and then is let go such that the balls velocity makes an angle 30 degrees from the horizontal and then covers a distance of 1,000m before it hits the ground. What was the centripetal accelertaion provided by the string??

    Picture provided


    2. Relevant equations

    Ac = v^2 / r

    3. The attempt at a solution

    I don't really understand how to get the velocity in order to just plug in everything else into the equation.
    Last edited: Oct 31, 2011
  2. jcsd
  3. Oct 31, 2011 #2
    Work backwards. What velocity would you need to make the ball arc 30 and cover 1000m for instance.
  4. Nov 1, 2011 #3
    I'm still not understanding it. :confused:
  5. Nov 1, 2011 #4
    He's saying pretend there was just a projectile fired at a 30 degree angle that covered 1000m, from that you can find the velocity of the projectile, that velocity is the same as the velocity the object was moving as it spun around the circle.
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