Question 10
Work, Energy and PowerIf a pump is capable of lifting 5000 kg of water through a vertical height of 60 m in 15 min, the power of the pump is
- A.2.5 × 105Js−1
- B.2.5 × 104Js−1
- C.3.3 × 103Js−1
- D.3.3 × 102Js−1
Show the answer and explanation
Answer: C (3.3 × 103Js−1)
Explanation
Power = mgh/t = 5000 × 10 × 60 ÷ (15 × 60) ≈ 3333 W = 3.3 × 103 J s−1.