Physics
posted by Max .
A brass wire with Young's modulus of 9.20 1010 Pa is 2.5 m long and has a crosssectional area of 4.6 mm2. If a weight of 5.2 kN is hung from the wire, by how much does it stretch?

E = 9 * 10^10
9 * 10^10 dL/2.5 = 5.2*10^3 /4.6*10^6
9 dL /2.5 = .52/4.6
dL = .031m = 31mm = 3.1 cm
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