Water flow through horizontal pipe of varying cross-section at the rate of `1//2` liter per second. Determine the velocity of flow of water at a point where the diameter is (a) `4 cm` (b) `2 cm`.

Explanation

`V=(1)/(2) litre//s =500 c.c.//s`,
(a)`2 r=4 cm` or `r=2 cm`.
`v=(V)/(pir^(2))=(500)/((22//7)xx2^(2))=(500xx7)/(22xx4)`
`=39..8 cm s^(-1)`