Q.

An aluminium rod with Young’s modulus Y=7.0×1010N/m2 undergoes elastic strain of 0.04%. The energy per unit volume stored in the rod in SI unit is 

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a

11200

b

5600

c

8400

d

2800

answer is C.

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Detailed Solution

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 Energy  Vol =12× stress × strain =12Y strain 2=12×7×1010×0.041002=5600J/m3

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An aluminium rod with Young’s modulus Y=7.0×1010N/m2 undergoes elastic strain of 0.04%. The energy per unit volume stored in the rod in SI unit is