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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60%, if g = 10 ms⁻², the power of the engine is [BCECE 2008]

Answer: (A)

Solution

Useful power = mgh/t = (100)(10)(10)/5 = 2000 W. Actual power = (useful power)/η = 2000/0.6 ≈ 3333 W ≈ 3.3 kW.

Question ID VK-153627