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Error analysis using partial derivatives (wrong forum, can this be moved?)

  1. Sep 12, 2009 #1
    edit: Totally put this in the wrong forum on accident. Can it be moved to the Calculus and Beyond forum? Thanks.

    1. The problem statement, all variables and given/known data

    calculate the error associated with stress and strain

    2. Relevant equations

    1om8tc.jpg

    First equation is stress, second equation is strain.
    P is load, A is area, L is original length, and delta is elongation.

    3. The attempt at a solution

    During class, I was able to come up with this, and the instructor said it was correct.

    eqpedg.jpg

    but....now what? Which values do I use? I'm also not sure what deltaA and deltaP are. What we did was stretched a metal bar until it snapped, so I have tons of points to use. I have the load it took to break, I have original and final cross sectional areas, original and final lengths. Really unsure of how I'm supposed to use this error analysis.


    thanks guys
     
  2. jcsd
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