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प्रश्न
A hose-pipe of cross-section area 2 cm2 delivers 1500 liters of water in 5 minutes. What is the speed of water in m/s through the pipe?
उत्तर
Vol. of water flowing in 1 sec= ` (1500 xx 1000)/(5 xx 60 )= 5000 "cm"^3`
Vol. of water flowing =area of cross-section speed of water
` 5000 "cm"^3/s = 2 "cm"^2 xx "speed of water"`
⇒ speed of water = `( 5000 )/( 2 ) "cm"/s`
⇒ speed of water = `2500 "cm"/s`
⇒ speed of water = `25 "m"/s`
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