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Homework Statement
Homework Equations
The Attempt at a Solution
I tried to use the equation introduced in the class, E=σε/2
ε=αΔT =2*10^{5}*200 = 4*10^{3}
and by σ=Yε, I get σ=110*10^{9}*4*10^{3} = 4.4*10^{9}
so E=(4*10^{3}) * (4.4*10^{9} ) /2 = 880000J
Why am I wrong?
The correct answer is 35.2 J
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