$2.)$ An element in a two$-$dimensional $x-y$ stress system is subjected to a tensile stress of $64\frac{N}{m}m2$ in the $x-$direction and a compressive stress of $48\frac{N}{m}m2$ in the y $-$direction. If the major principal stress is limited to $80\frac{N}{m}m2,$ calculate the shear stresses, the maximum shear stress and the minor principal stress. Calculate also the directions of the principal and shear stresses. Illustrate the calculated answers on a scaled diagram of Mohr's circle.