Evaluate the principal stresses & the maximum in-plane shear stress of the stress element by considering reference stress values that are defined for two mutually perpendicular planes x & y. the plane x is subjected to a compressive stress of 20mpa while plane y is subjected to a tensile stress of 70mpa. when considering the shear stress condition, the shear stress acting on plane x allows the stress element to rotate in clockwise direction while that of plane y causes the opposite effect. magnitude of the shear stress applied on the planes is 60mpa. also evaluate & compare the original stress values with the new stress values when the original stress element is once rotated 30 degrees along the clockwise direction & again when the original stress element is rotated 30 degrees along the anti-clockwise direction with respect to the original position. during the calculations only graphical techniques related to the mohr's circle method must be used & all necessary stress conditions must be sketched with the respected angular positions of the stress element.