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String Tension

  1. Oct 11, 2016 #1
    1. The problem statement, all variables and given/known data
    A small ball with mass m=1.1kg moves on the end of a string with length L=2.9. The string is anchored at point A and travels in a horizontal circle as shown. The string is at and angle of 36 degrees from the vertical.
    What is the string tension as the ball swings in this circle?
    What is the magnitude of the ball's acceleration?
    What is the time required for the ball to go around the horizontal circle 80 times?

    2. Relevant equations

    3. The attempt at a solution
    1.1*9.8=10.78 N
  2. jcsd
  3. Oct 11, 2016 #2


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    Staff: Mentor

    That's not a very ambitious attempt o_O You'll need to show a bit more work, something that pertains to the rest of the problem.

    What else have you tried? Did you draw a free body diagram? How does the length of the string fit into the problem? What type of motion is involved? What equations do you know that pertain to that type of motion?
  4. Oct 11, 2016 #3
    I really have no idea how to get started? How do I know what to find first?
  5. Oct 11, 2016 #4


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    Staff: Mentor

    Sorry, but we're not going to take you step by step through your homework, doing it for you in the process. You have to bring some effort to the table. You must have similar examples in your course materials or textbook, at least ones that introduce the concepts and equations that are relevant to the problem. You should at the very least be able to post a sketch of the scenario and draw the free body diagram.
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