Q4. At a point in a material under stress, the intensity of the resultant stress on a certain plane is 60 N/mm (tensile) inclined 30 to normal of that plane. The stress on a plane at right angle to this has a normal tensile component of intensity 40 N/mm. Using the Mohr's circle calculate, resultant stress on the second plane, the principal planes and stress, plane of maximum shear and its intensity.