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strain = ΔL/L

stress = F/A

Young's modulus = (F/A)/(ΔL/L)

I haven't gotten any of these right and I have no idea what I'm doing wrong on them.

a) 2.3 cm = .023 m / 15 m = .0015

b) A = ∏r

^{2}= (∏)(.0091/2)

^{2}= 6.503E-5 m

^{2}

stress = ((77)(9.8))/(6.503E-5) = 1.16E7 N/m

^{2}

c) (754.6/6.503E-5) / (.023/15) = .756

None of those were right; also I thought Young's modulus was supposed to be a huge number so obviously that's not right. Any help is appreciated!