29h ques

Asked by lovemaan5500 | 27th Dec, 2017, 01:35: PM

Expert Answer:

2000 liter of water = 2000 kg of water
 
to raise 2000 kg of water to heigth 10m, required energy = m×g×h = 2000×9.8×10 Joules
 
workdone by the pump of 2 kW with 70% effeicency  in t seconds = 2000×(100/70)×t joules
 
if this workdone is same as the required energy to raise 2000 kg of water to 10 m height, then time taken is given by
 
2000×(100/70)×t = 2000×9.8×10
 
t = (9.8×10×70)/100 = 9.8×7 = 68.6 s

Answered by  | 27th Dec, 2017, 02:25: PM