The terminal velocity of a small sphere of radius $a$ in a viscous liquid is proportional to
$a^2$
$a^3$
$a$
$a^{-1}$
Write $\mathrm{SI}$ and $\mathrm{CGS}$ unit of coefficient of viscosity.
An object falling through a fluid is observed to have acceleration given by $a = g -bv$ where $g =$ gravitational acceleration and $b$ is constant. After a long time of release, it is observed to fall with constant speed. The value of constant speed is
Why is dust particles settled down on floor in a closed room ? Explain.
A small spherical solid ball is dropped from a great height in a viscous liquid. Its journey in the liquid is best described in the diagram given below by the
The average mass of rain drops is $3.0\times10^{-5}\, kg$ and their avarage 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