An orthotropic material has the follow properties: E_x = 7500 ksi, E_y = 2500 ksi, G_xy =1250ksi, and V_xy =.25. Determine the principal direction for the stresses and strain at a point on a free surface where the following stresses were computed: σ_xx=10ksi (tension) σ_yy=7 ksi (compression), and τ_xy = 5 ksi.