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Elasticity and Oscillations problem-Fractional Length Change of a Cable?

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A steel cable of diameter 3.0 cm supports a load of 2.0 kN.

What is the fractional length increase of the cable compared to the length when there is no load if Y=2.0E11 Pa?

As far as I know is that I need to use

delta L = LF/AY

but then, how do I find the L ?

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  1. You don't need to find L. Fractional length increase is deltaL/L which = F/(AY).

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