Which of the following units fails to measure work, energy, or thermal heat?
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Answer: D. hp
Explanation
Horsepower measures power which is the rate of energy transfer rather than energy itself. The other listed units all measure work thermal heat or accumulated energy quantities. Power divides work by time making its dimensional formula distinct from energy. Power quantifies how fast work is performed over a specified time duration. Energy units like kilowatt hours integrate power over elapsed operating time. Mechanical horsepower equals seven hundred forty six watts of power output.
Automotive engine specifications list horsepower to indicate maximum power delivery rates. Comparing energy consumption versus power output prevents confusion in engineering design. Electric motor ratings distinguish between running power and total energy capacity. Option A kilocalories measure thermal heat energy units. Option B kilogram meters measure mechanical work energy units. Option C kilowatt hours measure electrical energy consumed over time.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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