Question

12. How many litres of water flows out of a pipe in 1 hour having an area of cross-section 5 cm“, if the
speed of water is 30 cm/s?
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Answer 1

Answer:

Given, area of the cross section of pipe = 5 cm2

Speed of the water flowing out of the pipe = 30 cm/sec

Now, volume of the water flowing out of the pipe in one second = area of the cross section * 30

                                                                                        = 5 * 30

                                                                                        = 150 cm3

 Volume of the water flowing out of the pipe in one minute = 60 * 150

                                                                                 = 9000 cm3

Since 1000 cm3 = 1 litre

So, 9000 cm3 = 9 litres

Hense, Volume of the water flowing out of the pipe in one minute is 9 litres.

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Answer 2

Answer:

54 liters of water flows out of the pipe in 1 hour

Step-by-step explanation:

the are of cross section of the pipe is 5 sq.cm

the length of water that can flow through it i one second is 30 cm

therefore, in one hour 30 x 3600 = 10800 cm of water can flow

hence, the volume of water that can flow in 1 hour is =

                                                                     ar (crosection) x length in one hour

                                                             = 5 x 10800

                                                             = 54,000 cm3

1000 cm3 = 1 l

therefore, 54 liters of water flows out of the pipe in 1 hour