Question 10
Work, Energy and PowerIf a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in 1 minute, what is the total power expended? [g ≈ 10 ms−2]
- A.11.50 kW
- B.12.60 kW
- C.11.25 kW
- D.12.10 kW
Show the answer and explanation
Answer: C (11.25 kW)
Explanation
Power = mgh/t = 750 × 10 × 90 ÷ 60 = 11 250 W = 11.25 kW.