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
\[\text{ Volume of water flowing in 1s }= \pi(0 . 0075 )^2 \times 700\]
\[\text{ Volume of the water flowing in 1 hour }= \pi(0 . 0075 )^2 \times 700 \times 60 \times 60\]
\[\text{ Volume of the water flowing in 1 hour }= \frac{22}{7} \times (0 . 0075 )^2 \times 7 \times 60 \times 60 = 4 . 455 m^3 = 4455 l (1000 l = 1 m^3 )\]