There are two identical small holes of area of cross-section a on the opposite sides of a  tank containing a liquid of density $\rho$. The difference in height between the holes is $h$. Tank  is resting on a smooth horizontal surface. Horizontal force which will have to be  applied on the tank to keep it in equilibrium is

An ice block floats in a liquid whose density is less than water. A part of block is outside the liquid. When whole of ice has melted, the liquid level will

A piece of copper having an internal cavity weights $264\, g$ in air and $221\, g$ in water. Find volume (in $cc$) of cavity. Density of $Cu = 8.8\, g/cc$

An ice berg of density $900 Kg/m^3$ is floating in water of density $1000 Kg/m^3$. The percentage of volume of ice-cube outside the water is …… $\%$

A boat carrying steel balls is floating on the surface of water in a tank. If the balls are thrown into the tank one by one, how will it affect the level of water