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Homework Help: Anyone want to help me with this newton's law problem?

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data
    A piece of string of length l and mass M is fastened into a circular loop and set spinning about the center of a circle with uniform angular velocity omega. Find the tension in the string. Suggestion: Draw a force diagram for a small piece of the loop subtending a small angle delta theta.

    2. Relevant equations

    3. The attempt at a solution
    I know I'm supposed to use differentials and then integrate, but isn't the tension in the rope the same everywhere?
  2. jcsd
  3. Sep 23, 2012 #2


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    Science Advisor

    If you mean the string, then, yes, it is.
  4. Sep 23, 2012 #3
    but how do you find that tension?
  5. Sep 23, 2012 #4


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    Homework Helper

    Did you try drawing the force diagram, as suggested? What are the forces acting on the small piece of loop?
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