I have the following problem:(adsbygoogle = window.adsbygoogle || []).push({});

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?

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# Homework Help: About Tension

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