A pump on the ground floor of a building can pump up water to fill up a tank of

A pump on the ground floor of a building can pump up water to fill up a tank of volume 30 in 15 minutes. If the tank is 40 m above the ground, how much electric power is consumed by the pump? The efficiency of the pump is 30%.

Posted by: - Ali
Posting Time: - 7/17/2015 1:25:22 AM
Subject: - Physics

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Best 5 Answers:-

Answer by:- John Bert

Given, the volume of the tank = 30
Mass of the water, m = 30*1000 kg = 30000kg
Time, t = 15 min = 15*60 = 900s
Height, h = 40 m
Total work done by the pump, W = F*h= mgh = 30000*9.8*40 = 11760000 J
Power, P = W/t = 11760000/900 = 13066.67 watt
But efficiency = 30% = 3/10
Required power, P = 13033.67*10/3 = 43.56 kW.

 
   

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