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				| 1. | Elastic strain energy per unit volume or strain energy density is NOT equal to ________Where σx=stress in x direction, εx=strain in x direction, E=young’s modulus, P=load, Δ=elongation.a) \(\frac{1}{2}(\sigma x\epsilon x)\) b) \(\frac{1}{E}(\sigma x^2)\) c) \(\frac{1}{2}(E\epsilon x^2)\) d) \(\frac{1}{2}(p \Delt | 
| A. | \(\frac{1}{2}(\sigma x\epsilon x)\) | 
| B. | \(\frac{1}{E}(\sigma x^2)\) | 
| C. | \(\frac{1}{2}(E\epsilon x^2)\) | 
| D. | \(\frac{1}{2}(p \Delta)\) | 
| Answer» E. | |