WAEC Physics 2014 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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A car traveling at 30 ms⁻¹ overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1hp=0.75kW]
- A. 0.23 hp
- B. 0.40 hp
- C. 4.00 hpCorrect
- D. 4.40 hp
Explanation
Power = Force × velocity = 100×30 = 3000W = 3kW. In horsepower: 3/0.75 = 4.00hp.
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