Power (average)
Mediumphysics
A pump lifts 200 kg of water vertically 8 m in 20 s (g = 10 m/s²). Average power?
Select the correct option:
Solution
Incorrect! Answer:
800 W
- Power Definition: Power is the rate at which work is done (P=W/t).
- Energy Output: The work done in lifting mass m to height h is the change in potential energy: W=mgh.
- Calculation of Work:
- W=200×10×8=16000 J.
- Calculation of Power:
- P=16000 J/20 s=800 J/s.
- Conclusion: The average power is 800 W.
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About This Question
- Subject
- physics
- Chapter
- work, energy and power
- Topic
- power (average)
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
800 W
- Power Definition: Power is the rate at which work is done (P=W/t).
- Energy Output: The work done in lifting mass m to height h is the change in potential energy: W=mgh.
- Calculation of Work:
- W=200×10×8=16000 J.
- Calculation of Power:
- P=16000 J/20 s=800 J/s.
- Conclusion: The average power is 800 W.
This medium difficulty physics question is from the chapter work, energy and power, covering the topic of power (average). It appeared in the 2025 exam.
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