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A wire has stress 4.0e8 Pa and strain 2.0e-3. What is its stored energy per cubic metre?
A8.0e5 J
B2.0e11 J
C4.0e5 J
D1.6e6 J
Answer & Solution
Correct answer: C. 4.0e5 J
Energy density = 0.5 x 4.0e8 x 2.0e-3 = 4.0e5 J per cubic metre.
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