$\left\{x \in R: \frac{2x-1}{x^3+4x^2+3x} \in R\right\}$ equals

When $Mg$ burns in air,it produces

$\sum_{k=1}^5 \frac{1^3+2^3+\ldots+k^3}{1+3+5+\ldots+(2k-1)}$ is equal to (in $.5$)

The overall goal of glycolysis,Krebs' cycle,and the electron transport system is the formation of

Complete hydrolysis of cellulose yields ........

Starting from rest, the time taken by a body sliding down on a rough inclined plane at $45^{\circ}$ with the horizontal is twice the time taken to travel on a smooth plane of the same inclination and same distance. Then the coefficient of kinetic friction is: