The principal strains at a point on an aluminum plate are (epsilon_{1}=780left(10^{-6} ight)) and (epsilon_{2}=400left(10^{-6} ight)). Determine

The principal strains at a point on an aluminum plate are \(\epsilon_{1}=780\left(10^{-6}\right)\) and \(\epsilon_{2}=400\left(10^{-6}\right)\). Determine the associated principal stresses at the point in the same plane. \(E_{\mathrm{al}}=10\left(10^{3}\right) \mathrm{ksi}, u_{\mathrm{al}}=0.33\).