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Homework Help: Elastic Modulus - Probably a dumb question but I can't do it

  1. Oct 29, 2012 #1
    WEIGHT (kg) Length (m) How much it extended (m) STRESS STRAIN
    0.1 0.11 0.4
    0.2 0.13 0.6
    0.3 0.18 0.11

    I did an experiment in physics for youngs modulus, I need to workout the stress and strain on an elastic band with weights attached, but I have no idea how.

    Could anyone please help me to workout the stress and strain from the data I got from the experiment and please explain how


  2. jcsd
  3. Oct 29, 2012 #2
    Ok, I'm guessing that your columns are respectively weight, length and how much it extended? Anyways to determine E (Young's modulus) we're going to have to know the cross sectional area of the specimen. E=sigma/epsilon so we need to calculate stress with the formula sigma=F/A. Anyways I'm just a first year eng student and I haven't learned much in my materials class yet but as far as I know you're going to need the cross sectional area
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