Calculate the strain energy per unit volume in a brass wire of length 3 m and area of cross-section 0.6 kg wt is applied to its free end.

Explanation

Given : `L =3 m, A=0.6 mm^(2)=0.6 xx 10^(-6) m^(2), l=3 mm=3 xx 10^(-3)m, F=6 kgwt.=6xx9.8 N`
Strain energy per unit volume
`=(1)/(2)((F)/(A))xx((l)/(L))`
`=(1)/(2)((6xx9.8)/(0.6xx10^(-6)))xx((3x10^(-3))/(3))`
`=4.9xx10^(4)J//m^(3)`