Final answer:
A heat engine in physics converts heat energy to mechanical work with efficiency being a critical factor in its performance.
Explanation:
A heat engine is a system in thermodynamics that converts heat energy to mechanical work. Gasoline engines, diesel engines, jet engines, and steam turbines are examples of heat engines that utilize heat transfer to perform work. Efficiency, defined as useful work extracted divided by the amount of energy input, is a crucial parameter for any heat engine as it determines how effectively the engine converts heat into work.
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