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Homework Help: Materials and their use in structures

  1. Mar 28, 2010 #1
    A cable has an unstretched length of 12.0m and is stretched by 1.2 x 10^(-4)m when a 6.4 x 10^(8) Pa stress is applied. What is the strain per unit volume in the cable in J m^(-3), when this stress is applied?

    Any help would be very nice. I dont understand what to do.
  2. jcsd
  3. Mar 28, 2010 #2


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    Homework Helper

    When a graph of stress vs. strain is drawn, up to the yield point (or around there), it is a straight line in the elastic region.

    It forms a triangle. So the area under that graph gives the energy.
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