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प्रश्न
Water is being pumped out through a circular pipe whose external diameter is 7 cm. If the flow of water is 72 cm per second how many litres of water are being pumped out in one hour.
उत्तर
Volume of water that will be pumped out in 1 second = π`(7/2)^2 (72)` cu cm
∴ Volume of water that will be pumped out in one hour
= π`(7/2)^2 (72) (3600)` cu cm
= 99,79,200 cu cm
= 9979.2 litres.
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