A hole of area `1 mm^(2)` opens near the bottm of a large- water storage tank, and a stream of water shoots from it. If the top of water in the tank is to be kept at `20` m above the point of leak , how much water in litres//s should be added to the reservoir tank to keep this level ? `(g=10 m//s^(2))`.

Explanation

Velocity of out folowing water, `v=sqrt(2gh)=sqrt(2xx10xx20)=20 m//s`
Quantity water flowing out per sec
`a v =10^(6)xx20 m^(3)//s`
`=2xx10^(5)xx10^(3) litres//s`
`2xx10^(-2) litres//s =20 ml//s`