A load of 4.0 kg is suspended from a ceiling through a steel wire of length 20 m and radius 2.0 mm. It is found that the length of the wire increases by 0.031 mm as equilibrium is achieved. Find Young modulus of steel. Take `g=3.1pims^-2`

Explanation

The longitudiN/Al stress= ((4.0kg)(3.1pims^-2))/(pi(2.0xx10^-3m)^2)`
`=3.1xx10^6Nm^-2`
`the longitudiN/Al strain =(0.31xx10^-3m)/(2.0m)`
`=0.0155xx10^-3`
Thus `Y=(3.1xx10^6Nm^-2)/(0.0155xx10^-3)=2.0xx10^11Nm^-2`