What is a heat engine? a. A machine that heats up as it does ...

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What is a heat engine?
 a. A machine that heats up as it does work.
  b. A machine that produces heat.
  c. A machine that destroys heat, cooling its surroundings.
  d. A machine that converts heat to work.
  e. A machine that transfers heat to surrounding cooler objects.

Question 2

In Joule's paddle-wheel experiment (shown here), why won't the weight rise when we heat the water?
 a. The random motion of water molecules hitting both sides of each paddle wheel does not result in a net force on one side of each paddle.
  b. Energy conservation would be violated because no external force is applied.
  c. The heat supplied by the flame does not provide sufficient energy to raise the weight.

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Answer to Question 1

d

Answer to Question 2

a

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