3. Every direct stress is always accompanied by a strain in its own direction and an opposite kind of strain in every direction, at right angles to it. Such a strain is known as
5. According to Euler's column theory, the crippling load for a column of length (l) fixed at both ends is __________ the crippling load for a similar column hinged at both ends.
6. The resultant stress on an inclined plane which is inclined at an angle ? to the normal cross-section of a body which is subjected to a direct tensile stress (?) in one plane, is