Since heat energy can never be transformed completely into mechanical energy, so the efficiency of a heat engine can never be 100 per cent. Early heat engines could convert only about 10% of the heat energy into mechanical energy, so they had 10% efficiency.
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Since heat energy can never be transformed completely into mechanical energy, so the efficiency of a heat engine can never be 100 per cent. Early heat engines could convert only about 10% of the heat energy into mechanical energy, so they had 10% efficiency.
Explanation:
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