Copper has a breaking stress of about
3 × 10^8 N/m2.

What is the maximum load that can be
hung from a copper wire of diameter 0.5 mm?

If 55% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch?

I got the first one which is 58.90486N. I have no idea how to do the second though.

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1. Force=E*a*deltaL/L

solve for delta L/L
E is Youngs modullus for Copper, look that up

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