Question

e) An electric pump is used to lift water to a height of 60 m in 2 minutes. If the mass of the water raised is 800kg, find the power of pump. (g = 9.8m/s2)​

Answer 1

Total work done is the sum of potential and kinetic energies,

i.e. W=mgh+21mv2

Thus,

P=tW=tmgh+21mv2

=60(800×10×10)+21×800×(20)2

=4000W.

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Answer 2

Answer:

Total work done is the sum of potential and kinetic energies,

i.e. W=mgh+ 21

mv 2

Thus,

P= tW

=tmgh+ 21mv 2

=60(800×10×10)+ 21×800×(20) 2

=4000W.