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A structural steel rod has a radius r =1...

A structural steel rod has a radius r =10mm and a length l.=1m When a force F=100kN is applied, it stretches it along its length. Young's modulus of elasticity of the structural steel is `2.0xx10^(11) Nm^(-2)`. What is the elastic energy density of the steel rod ?

A

19.2 J

B

3.92 J

C

7.92 J

D

79.2 J

Text Solution

Verified by Experts

The correct Answer is:
D
Hint : `U=(1)/(2)"(stress) (strain)"xx"volume"`
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