AIPMT PRELIMS 2010 Physics Power MCQ Question
An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine?
800 W
400 W
200 W
100 W
Correct Answer
Detailed Explanation
The power of the engine is calculated using the formula P = dV/dt × v² = μv³, where μ is the mass per unit length and v is the velocity. Substituting the given values, P = 100 × 2³ = 800 W.
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