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Homework Help: About Tension

  1. Nov 11, 2004 #1
    I have the following problem:
    The specimen (rod) is hanging vertically. Weight=P. Young's modulus = E. Area = S. What is the ε-?
    ε = dL/L

    As I know Energy U=V*(E*ε ^2)/2
    And the work is A=P*dL(dL of center of mass)
    In this case A=p*dL/2
    So it must be that ε =P/(E*S)
    But the correct answer is ε =P/(2*E*S)
    Where is the mistake?
    Last edited: Nov 11, 2004
  2. jcsd
  3. Nov 11, 2004 #2

    Doc Al

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    Staff: Mentor

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