The following data refer to a circular bar subjected to a tensile test:

Diameter of bar \(=25 \mathrm{~mm}\)

Tensile load \(=45 \mathrm{kN}\)

Gauge length \(=300 \mathrm{~mm}\)

Extension \(=0.133 \mathrm{~mm}\)

Decrease in diameter \(=0.0033 \mathrm{~mm}\)

Determine

(a) Posisson's ratio, and (b)Young's modulus of elasticity.