Which of the following is defined as 33,000 foot-pounds per minute?

Question

BlackTom AI · Accepted Answer

One horsepower is defined as 33,000 foot‑pounds per minute.

1. Relevant knowledge points and concepts
- Power is the rate at which work is done or energy is transferred: Power = Work / Time.
- Horsepower is a historical unit of power introduced by James Watt; its mechanical definition is exactly 33,000 foot‑pounds per minute.
- Energy and work share the same dimensions/units (e.g., foot‑pound), while power has units of energy per time (e.g., foot‑pound per minute or watts).

2. Complete reasoning process step by step
- The phrase "33,000 foot‑pounds per minute" explicitly gives an energy quantity (foot‑pound) divided by time (minute), which is the definition of a power unit.
- Among the choices, the specific name for that unit is "Horsepower." Although "Power" describes the physical quantity, the question asks which of the following is defined as that numeric value and unit; the conventional name for that magnitude is horsepower.

3. Calculations with intermediate steps (unit conversion to SI for clarity)
- 1 foot‑pound (ft·lb) = 1.355817948 joules (J).
- 33,000 ft·lb/min = 33,000 × 1.355817948 J/min = 44,742. (approx.) J/min.
- Convert minutes to seconds: 44,742 J/min ÷ 60 s/min = 745.7 J/s = 745.7 watts.
- This confirms the well‑known equivalence: 1 horsepower ≈ 745.7 W.

4. Why the correct answer is correct
- The numeric definition “33,000 foot‑pounds per minute” is the precise historical definition of one mechanical horsepower. That matches the option "Horsepower."

5. Why the other options are incorrect
- Power: This is a general physical quantity (rate of doing work). The question asks for the specific unit/name associated with that numeric definition, not the generic concept.
- Energy: Measured in foot‑pounds (ft·lb) but not per minute; energy is not expressed as ft·lb/min.
- Work: Work is the same kind of quantity as energy (ft·lb), not ft·lb per minute.

6. Conclusion
The correct answer is Horsepower, which matches the provided answer.

Which of the following is defined as 33,000 foot-pounds per minute?单项选择题

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