Where is the pacemaker located?

$\int_0^3 \frac{3x+1}{x^2+9} dx$ is equal to :

The number of divisors of $7!$ is

$A$ ball of mass $1.2 \ kg$ moving with a velocity of $12 \ ms^{-1}$ makes a one-dimensional collision with another stationary ball of mass $1.2 \ kg$. If the coefficient of restitution is $\frac{1}{\sqrt{2}}$,then the ratio of the total kinetic energy of the balls after collision to the initial kinetic energy is:

Compound squamous epithelium is found in

Which one of the following statements is incorrect?