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CBSE Class 9 Answered

The power of water pump is 5kw 
question image
Asked by tnlakshmi0123 | 14 Aug, 2021, 12:06: PM
answered-by-expert Expert Answer
Energy Utilized by Pump in 1 min  = Power × time = 5000 W × 60 s = 3 × 105 J
 
Energy required to lift m kg of water to a height h =  ( m g h )
 
Since energy utilized by the pump is to lift m kg of water to a height h , then we have
 
 ( m × g × h ) = 3 × 105 J
 
Mass of water raised to a height  h = 15 m is given as
 
m = ( 3 × 105 ) / ( 10 × 15 ) = 2000 kg 
 
Hence mass of water raised by pump = 2000 kg  = 2000 L 
 
( mass of 1 Litre water = 1 kg )
 

Answered by Thiyagarajan K | 14 Aug, 2021, 12:56: PM

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