A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is $r$ and angular velocity of rotation is $\omega $ , then the difference in the heights of the liquid at the centre of the vessel and the edge is
$\frac{{{r^2}{\omega ^2}}}{{2g}}$
$\frac{{{\omega ^2}}}{{2g{r^2}}}$
$\sqrt {2gr\omega } $
none of these
A .......... $m/s$ speed the velocity head of water is equal to pressure head of $40\, cm$ of $Hg$ .
An $L-$ shaped glass tube is just immersed in flowing water towards tube as shown. If speed of water current is $V$, then the height $h$ upto which water rises will be
A candle of diameter $d$ is floating on a liquid in a cylindrical container of diameter $D (D >> d)$ as shown in figure. If it is burning at the rate of $2\, cm/hour$ then the top of the candle will
Water falls from a tap, down the streamline
The height of water in a tank is $H$. The range of the liquid emerging out from a hole in the wall of the tank at a depth $\frac {3H}{4}$ form the upper surface of water, will be