Question: Your cars engine is a heat engine; it converts the thermal energy from burning fuel into energy to move your car and power its systems.

Your car’s engine is a heat engine; it converts the thermal energy from burning fuel into energy to move your car and power its systems. On a cold winter day, you needn’t feel guilty about cranking up the heat in your car; running the heater doesn’t cost any additional energy beyond the small amount needed to run the fan. Explain why this is so.

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