(Solved): In a standard tensile test, an aluminum rod of \( 50-\mathrm{mm} \) diameter is subjected to a ten ...

In a standard tensile test, an aluminum rod of \( 50-\mathrm{mm} \) diameter is subjected to a tension force of \( P=70 \mathrm{kN} \). Knowing that \( v=0.35 \) and \( E=70 \mathrm{GPa} \), determine: (a) the elongation of the rod in an \( 250-\mathrm{mm} \) gage length, (b) the change in diameter of the rod.