Question

1. An electric pump, used to obtain water from 20 metres below the ground, is marked 5000W.
a) If the pump operates as rated, how much energy is used to pump water every second?
b) Describe the energy conversions that take place when the pump is used.
c) What is the maximum mass of water that can be brought to the surface every second, and then discharged at 10 metres per second.
a. 5000 Watts = 5,000 J/s = 5000 Joules
every second.


a)p=Wnc÷time
5000=Wnc÷1s
Wnc=5000

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