alleryEnergy stored per unit volume in stretched wire:
A(1/2) × Y × strain²
B(1/2) × stress × strain
CAll equivalent
D(1/2) × stress²/Y
Answer & Solution
Correct answer: C. All equivalent
Elastic energy density u = (1/2) σ ε = (1/2) Y ε² = (1/2) σ²/Y. All three forms equivalent.
Analogous to (1/2)kx² for spring.
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