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TOPIC 6: Elasticity
A steel wire behaves like a spring and has its own "spring constant". Let's derive the "spring constant" of a steel wire.
Starting from Young's Modulus, E = Fl/Ae, by rearranging the variables, we end up with F = (EA/l)e.
If we compare this with the spring's equation, F = ke, we see that the "spring constant" of a steel wire is EA/l.
Since energy stored in a spring W = 1/2 k e2 , we can similarly write: energy stored in a stretched steel wire W = 1/2 (EA/l) e2
Unlike in a spring, which is easily stretched, it would take a very strong man (like superman) to make a noticeable stretch on a steel wire.
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