Question

Q.9 The water flows at a speed of 0.8m /sec from a pipe of a radius of 1.5 meters. Find the amount of water that flows out from the pipe in 20 minutes.​

Answer 1

6,785.84 m³ (cubic meters)

Explanation:

The rate of flow given in m/s = 0.8 m/s
Since the pipe has a radius of 1.5 m
Volume of water that flows in 1 second = π x 1.5² x 0.8 m

= π x 12.25 x 0.8 m³ / second

= 1.8π m³/s

20 minutes = 20 min x 60 seconds/min = 1200 seconds

In 1200 seconds, the amount of water that flows out of the pipe
= 1200 s x 1.8π m³/s

= 2,160π m³

= 6,785.84 m³