Question

From a tap of inner radius 0.75 cm, water flows at the rate of 7 m per second. Find the volume in litres of water delivered by the pipe in one hour.

Answer 1

Inner radius of a tap = 0.75 cm

Speed of flow of water in it = 7 m/s

Time = 1 hour

$\therefore$ Length of flow of water (h)

=$7\times 60\times$ 60 m = 25200 m

$\therefore$ Volume of water = $\pi r^2$ h

=$\frac{22}{7}\times \frac{0.75}{100}\times \frac{0.75}{100}\times 25200m^3$

=$\frac{22}{7}\times \frac{3}{400}\times \frac{3}{400}\times 25200m^3$

=$\frac{44550}{10000}{m}^3=4.455m^3$

Water in litres = 4.455 $\times$ 1000 l

= 4455 litres