: A bar of \(20 \mathrm{~mm}\) diameter is subjected to a pull of \(20 \mathrm{kN}\). The measured extension over a gauge length of \(200 \mathrm{~mm}\) is \(0.1 \mathrm{~mm}\) and the change in diameter is \(0.0035 \mathrm{~mm}\). Calculate the value of modulus of elasticity, bulk modulus, and Poisson's ratio.