वह समतल जिस पर केवल अभिलंब प्रतिबल (normal stress) कार्य करता है और कोई कर्तन प्रतिबल (shear stress) नहीं होता है, उसे क्या कहा जाता है?

Mohr's circle reduces to a point when an element is subjected to:

A steel column pinned at both ends has an Euler buckling load of 250 kN. If the column is restrained against lateral movement at its mid-height, its new buckling load will be:

What is the angle between the principal strain axis and the maximum shear strain axis in 2D strain analysis?