If 1 Horsepower equals 42.45 BTU's per minute, then the energy required to lift a 1 pound (.454 kg) weight, 778 feet (.24 km), against the force of gravity, would be the same as the number of BTU's required to raise the temperature of __________.
• Relationship between horsepower, foot-pounds, and BTU as units of energy/work • Definition of a BTU in terms of how much water it heats and by how many degrees • How lifting a weight through a height (in feet) relates to work done against gravity
• First, convert the work done lifting 1 pound through 778 feet into foot‑pounds. What does that number represent in terms of energy? • Recall (or look up) how many foot‑pounds are in 1 BTU. How does that compare to the 778 foot‑pounds you just found? • Once you know what 1 BTU does to water, match that definition to the answer choice that describes the same amount of heating.
• Verify the standard definition: 1 BTU is the amount of heat required to raise the temperature of a certain mass of water by 1°F. • Check that the foot‑pounds ↔ BTU conversion is consistent with the given horsepower information, even if you don’t fully compute it. • Confirm which option describes the standard water quantity associated with 1 BTU and a 1°F temperature rise.
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