For the following questions answer them individually
A screw having coefficient of friction equal to or greater than the tangent of the load angle is known as
For two springs having same stiffness (k) are in series, the equivalent stiffness would be
A material is classified as brittle, if the elongation in a gauge length of 59 mm,is less than
The value of c which makes the angle $$45^\circ$$ between $$\overline{a} = i + cj$$ and $$\overline{b} = i + j$$ is