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

Radius of the water tap = 0 . 75 cm = 0 . 0075 m
Length of the water flowing in 1 s = 7 m = 700 cm
$$\text{ Volume of water flowing in 1s }=\pi (0.0075{)}^2\times 700$$
$$\text{ Volume of the water flowing in 1 hour }=\pi (0.0075{)}^2\times 700\times 60\times 60$$
$$\text{ Volume of the water flowing in 1 hour }=\frac{22}{7}\times (0.0075{)}^2\times 7\times 60\times 60=4.455m^3=4455l(1000l=1m^3)$$