The principal stresses in the wall of a container are 40 MN/mm2 and 80 MN/mm2. The normal makes an angle of 300 with a direction of maximum principal stress. The resultant stresses (in magnitude) in the plane will be nearly
1
84 MN/mm2
2
72 MN/mm2
3
64 MN/mm2
4
58 MN/mm2