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Q.

The Young’s modulus of the material of a rod is 20×1010Pascal. When the longitudinal strain is 0.04% .The energy stored per unit volume is (in kJ/m3)

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answer is 16.

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Detailed Solution

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Given Y=20×1010 pascal 

Energy stored per unit volume,

=12 stress × strain =12Y( strain )2=12×20×1010×0.041002

=16×103 Joule /m3

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