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Homework Help: Calculating Force Using Young's Modulus

  1. Jan 28, 2010 #1
    1. How to calculate cross sectional area and force for Young's Modulus? My main issue is that I don't know my F or my Ao. Help?
    e=Constant 2.106
    Lo (original length of elastic)= 200mm

    2. E= FLo
    F= EAoDeltaLength[U/]
    F= (2.106)(10mm)(Ao)

    3. There are two unknown variables!! How can I do this?
  2. jcsd
  3. Jan 28, 2010 #2


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    Homework Helper

    Interesting. From the given change in length and original length, you can calculate the strain. Then you can multiply with E to obtain the stress. But you can't calculate the area if the force is unknown, and vice versa.
  4. Jan 28, 2010 #3
    What is the force though? How can force be calculated?
    How is cross-sectional area calculated?
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