Power (instantaneous)
Mediumphysics
A car exerts 1500 N driving force at 20 m/s. Instantaneous power output?
Select the correct option:
Solution
Incorrect! Answer:
30000 W
- Power Formula: Instantaneous power is the rate of work done, P=dW/dt=F⋅v.
- Magnitude form: P=Fvcosθ.
- Substitution: Assuming driving force is in the direction of motion (heta=0∘):
- P=1500×20
- P=30000 W.
- Prefix conversion: 30000 W =30 kW.
- Conclusion: The output power is 30000 W.
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About This Question
- Subject
- physics
- Chapter
- work, energy and power
- Topic
- power (instantaneous)
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
30000 W
- Power Formula: Instantaneous power is the rate of work done, P=dW/dt=F⋅v.
- Magnitude form: P=Fvcosθ.
- Substitution: Assuming driving force is in the direction of motion (heta=0∘):
- P=1500×20
- P=30000 W.
- Prefix conversion: 30000 W =30 kW.
- Conclusion: The output power is 30000 W.
This medium difficulty physics question is from the chapter work, energy and power, covering the topic of power (instantaneous). It appeared in the 2025 exam.
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