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Homework Help: Angular velocity help?

  1. Dec 14, 2009 #1
    1. The problem statement, all variables and given/known data

    Consider the conical pendulum, a mass on the end of a string, with the other end of the string fixed to the ceiling. Given the proper push, this pendulum can swing in a circle at an angle theta of 25.5 degrees with respect to the vertical, maintaining the same height throughout its motion. If the mass of the pendulum M is 14.6 kg and the length of the string L is 0.5 m, what is the speed of the mass as it swings?

    2. Relevant equations
    v = (coefficient of static friction x Rg)^1/2.
    R = .215 m

    I am not sure how to find the coefficient of static friction here, any help is appreciated.
     
  2. jcsd
  3. Dec 14, 2009 #2

    berkeman

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    Staff: Mentor

    Why would friction be involved in a pendulum problem?
     
  4. Dec 14, 2009 #3
    The friction was part of an equation in my physics book, but if you have another equation that would be great.
     
  5. Dec 14, 2009 #4

    berkeman

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    Staff: Mentor

    A friction term in a simple pendulum equation? Could you please post the equation and the description of the equation?

    I believe that traditional pendulums are considered to have a frictionless pivot...

    http://en.wikipedia.org/wiki/Pendulum

    .
     
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