A thin square plate of side $2\ m$ is moving at the interface of two very viscous liquids of viscosities ${\eta _1} = 1$ poise and ${\eta _2} = 4$ poise respectively as shown in the figure. Assume a linear velocity distribution in each fluid. The liquids are contained between two fixed plates. $h_1 + h_2 = 3\ m$ . A force $F$ is required to move the square plate with uniform velocity $10\ m/s$ horizontally then the value of minimum applied force will be ........ $N$
$6$
$12$
$24$
$40$
A small drop of water falls from rest through a large height $h$ in air; the final velocity is ................
From amongst the following curves, which one shows the variation of the velocity v with time t for a small sized spherical body falling vertically in a long column of a viscous liquid
Which falls faster, big rain drops or small rain drops ?
Give two uses of Stoke’s law.
Which of the following graphs best represents the motion of a raindrop?