An engine pumps out 40kg of water in second. The water comes out of vertically upward with a velocity of 3 ms-1, the power of engine in kilowatt is:
Correct answer: A. 1.2 kW
- A. 1.2 kW
- B. 12kW
- C. 120kW
- D. 1200kW
Explanation
Students should remember the formula of power i.e Force x speed So power = (mass x g) x speed assume g = 10] Power = (40 x 10) x 3 = 1200 W or 1.2 kW
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About Power
Power is the rate at which work is done or energy is transferred, with average power calculated over a time interval and instantaneous power found from P = Fv when force and velocity are aligned. Work includes units, mechanical efficiency, and the distinction between power and total work or energy.
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