1. the first practical heat engine that was invented was the ______ engine. 2. wind and moving water are ______ forms of energy. 3. when 1 cubic foot of water is changed to steam, it expands ______ times. 4. ______ is a very concentrated source of energy.

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Accepted Answer

### Question 1
# Brief Explanations:
The first practical heat engine invented was the steam engine, which used heat to produce mechanical work by harnessing steam power.
# Answer:
steam

### Question 2
# Brief Explanations:
Wind (kinetic energy of air movement) and moving water (kinetic energy of water flow) are kinetic forms of energy as they involve the motion of matter.
# Answer:
kinetic

### Question 3
# Brief Explanations:
When 1 cubic foot of water is converted to steam, it expands approximately 1600 times (this is a known physical property related to the phase change from liquid to gas, with a significant increase in volume due to the change in molecular spacing and state).
# Answer:
1600 (or approximately 1600)

### Question 4
# Brief Explanations:
Fuels like gasoline, diesel, or more concentrated sources like uranium (in nuclear energy) or even substances like coal can be very concentrated energy sources. A common and widely recognized concentrated energy source is "Nuclear fuel" (e.g., uranium) or "Gasoline", but a very common answer here is "Nuclear" or "Gasoline" or "Coal". Another common answer is "Petroleum" or "Oil". However, a very precise and common one is "Nuclear" (due to high energy per unit mass) or "Gasoline". Alternatively, "Hydrogen" can also be a concentrated energy source, but the most common fill - in here is often "Nuclear" or "Gasoline" or "Coal". A typical answer is "Nuclear" (as nuclear fuel has extremely high energy density) or "Gasoline". For simplicity, a common answer is "Nuclear" or "Gasoline". Let's go with "Nuclear" (or "Gasoline", "Coal", etc. are also acceptable, but "Nuclear" is a very concentrated source).
# Answer:
Nuclear (or Gasoline, Coal, Petroleum, etc. - Nuclear is a very concentrated source of energy)

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