(a) Copper has a breaking stress of about 3.00×108 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.37 mm?
(b) If 17 percent of this maximum load is hung from the copper wire, by what fraction of its original length will it stretch?
The Attempt at a Solution
I know that this one is simple, I just can't find the correct formula to use. Anyone got any ideas?