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Finding g of a pendulum

  1. Mar 14, 2007 #1
    1. The problem statement, all variables and given/known data

    I need to work out g for a pendulum. I have values for length (l) and time (T^2)

    2. Relevant equations

    T= 2 pi sqroot (l/g)

    3. The attempt at a solution

    I have plotted a graph of T^2 against l found the gradient of the line is this the value for g or if not do I need to rearrange the equation making g the subject ?

    I am not too strong on algerbra and I came up with g = l / (T^2 / 2 pi^2)

    but this gives me a silly small amount for g.

    the gradient of my graph is 16 which is also a little high for g?
  2. jcsd
  3. Mar 14, 2007 #2
    Double check your algebra...did you forget to square the 2 factor also? I think so, see if your answer makes sense then... hope that helps.
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