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Oscillations & Traveling Waves: How long is the string?

  1. Dec 6, 2009 #1
    1. The problem statement, all variables and given/known data

    A 111g ball is tied to a string. It is pulled to an angle of 4.40 Degrees and released to swing as a pendulum. A student with a stopwatch finds that 17 oscillations take 19.0s.
    How long is the string?

    2. Relevant equations

    T = 2π√(L/g)

    3. The attempt at a solution

    Period T = 19/17 = 1.118s

    g = 9.8m/s2

    1.118/2π = √L/g
    0.1779 = √L/g
    0.0316 = L/g

    L = 0.3101cm

    This is wrong, someone please tell me my mistake.
  2. jcsd
  3. Dec 6, 2009 #2


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    Homework Helper

    Keep track of units, you'll find it.
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