एक भुजा के समानांतर अपनी केंद्रीय अक्ष के परितः 'a' भुजा वाले वर्गाकार खंड का आकृति मापांक (section modulus) क्या होगा?

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?