# Work done by stretching a STring

I have been looking all over for an equation to find the work done on a steel string that is stretched L meters.

"Find the work needed to stretch the string."

I know it has variable forces so I was thinking I could use elastic potential

$$U=\frac{kx^{2}}_{2}$$

but now I have the problem finding out what K is.

ANY help is appreciated thanks.

Nick

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Dick
Homework Helper
Is this a homework problem? That can't be the full question. You've got the right idea if the steel wire can be considered as a spring. You'll need a modulus of elasticity and the geometry of the wire to actually do this.

yea I have the area of the wire and the modulus... I just need help figuring out which equation to use.

Thanks,
Nick

Dick