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How to find energy stored in a wire

  1. Sep 26, 2011 #1
    There are 1000 tonnes of high tensile steel wire stressed to 1000MPa. How much energy is stored in the steel?

    [itex]\sigma = P/A[/itex]

    First I multiplied the 1000 tonnes (1000000kg) by 9.8m/s^2. Then I found the volume by dividing the weight by the original weight. I don't know what to do next. I am not even sure if i am going in the right direction or which equation i should use. Any help is appreciated.
  2. jcsd
  3. Sep 27, 2011 #2
    If something streaches, its weight does not change. It gets thinner but longer. Hint: Find the volume by using metal properties.
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