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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.Why is this so?A. The heater uses inevitable waste heat from the car's engine.B. The fan can sufficiently warm up the air due to the work it does on the air.
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