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Homework Help: What is the tangential speed of the ball?

  1. Oct 2, 2007 #1
    1. The problem statement, all variables and given/known data
    A 0.700 kg ball is on the end of a rope that is 0.60 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What is the tangential speed of the ball?
    ? m/s

    2. Relevant equations

    3. The attempt at a solution

    I know that in order to solve this problem I need to find time, but I'm not sure how to do that. I know that I need time to be abel to find w and that r=0.60m I think. Any help would be great. Thank you. There is a picture that is attached to help with the problem.

    Attached Files:

  2. jcsd
  3. Oct 2, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Start by analyzing the forces that act on the ball. Apply Newton's 2nd law. Is the ball accelerating?
  4. Oct 2, 2007 #3
    It has centripetal acceleration.Break the forces acting into components.You will get relation of T,and another relation with centripetal acc.Equate and u will get V.
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