Question

What is the time required for the same amount of water to flow out if the water level in tank is maintained always at a height of $1m$ from orifice?

Answer 1

Rate of flow of water$Q=a\sqrt{2gH}=$constant
Total volume of water V=AH
$\therefore$ Time take to empty the tank with,constant rate
$t=\frac{V}{Q}=\frac{AH}{a\sqrt{2gH}}$
$=\frac{400\times 1}{\sqrt{2\times 9.8\times 1}}$
$=90$ s$=1.5$ min