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Work Energy and Power question

2021 · Q141
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Work Energy and Power question

2021 · Q141

NEETPhysicsWork Energy and PowerMCQ+4 / −1
Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s2)
  1. A
    7.0 kW
  2. B
    10.2 kW
  3. C
    8.1 kW
  4. D
    12.3 kW
View written solutionFree

Correct answer: C

E = mgh

Pinput = mght{{mgh} \over t}tmgh​

=15×10×601=9000=9 = {{15 \times 10 \times 60} \over 1} = 9000 = 9=115×10×60​=9000=9 kW

10% loss = 0.9 ×\times× 103

Poutput = 9 ×\times× 103 −-− 0.9 ×\times× 103 = 8.1 kW

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