The average mass of rain drops is $3\text{.}0\times 10^{-5}\text{kg}$ and their average terminal velocity is 9 m/s. Calculate the energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.

Explain the matter.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

$\mathrm{\Delta G}°$ of the cell reaction $\mathrm{AgCl}\left(\mathrm{s}\right)+\frac{1}{2}{\mathrm{H}}_2\left(\mathrm{g}\right) \to \mathrm{Ag}\left(\mathrm{s}\right)+{\mathrm{H}}^{+}+{\mathrm{Cl}}^{-}$ is $-21.52\mathrm{kJ}. \mathrm{\Delta G}°$ of  $2\mathrm{AgCl}\left(\mathrm{s}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right) \to 2\mathrm{Ag}\left(\mathrm{s}\right)+2{\mathrm{H}}^{+}+2{\mathrm{Cl}}^{-}$ is: