Equation help

Discussion in 'Physics' started by Robin Mitchell, Dec 8, 2010.

  1. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
    Hi everyone

    Just did a pratical exam and i want to know where this equation comes from:

    There is an oscillating metal strip with a mass attatched to the end.

    youngs modulus = (16 PI ^2 * M K^2) / (b * d^3)
    lg f = lg K + n lg L
    F is the frequency in hz
    L is the length of the strip in m
    n is the gradient (i got about -0.98)
    lg K is the intercept and its a length of some sort
    M is the mass (i got 100g)
    b is the width of the strip
    d is the thickness of the strip

    Also, this equation implies that younges modulus can vary with the mass on the end!

    Thanks
     
  2. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
    732
    199
  3. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  4. BillO

    Well-Known Member

    Nov 24, 2008
    985
    136
    I always loved questions that begin such: "Can you define in your own words..."

    I was always tempted to reply with "Yes. However, do you think you could understand it?"

    I'm glad to see my old alma mater is still asking simple questions the wrong way.
     
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