Question

how many litres of water will flow in 7 minutes from a cylinder pipe 1 cm in diameter ,if the water flows at a speed of 30 km per hour

Answer 1

Answer : $\bold{2746.4 cm}$



Explanation -


Given :

diameter is 1 cm. so radius = d/2 = 1/2 cm


${r}^{2} = \frac{1}{4}$

Given : 30 km per hour

1 km = 1000 m

30 km = 30 x 1000 = 30,000 m


1 hour = 60 minutes.

1 minute = 60 seconds

60 minutes = 60 x 60 = 360 seconds.


30,000 ÷ 360 = 83.33


Flow of water in 7 minutes -

= 3.14 x 1/4 x 83.33 x 60 x 7

= 2746.4 cm

Answer 2

Answer:

Step-by-step explain as we know that volume= πr^2h speed= 30km\h now 30000/60*60= 300/36m/s

Time= 7 m= 7*60=420s now distance=speed*time 300/36*420.

V= πr^2h =22/7*1/200*1/200*300/36*420=0.275m^3 *1000 =275liter