Grace Jiang
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The efficiency cannot be greater than unity and the absolute temperature cannot be less than zero, absolute zero. So, since T2 must be positive, the efficiency is always less than unity.
The Feynman Lectures on Physics Vol. I Ch. 44: The Laws of Thermodynamicsseven times more heat
The Feynman Lectures on Physics Vol. I Ch. 44: The Laws of Thermodynamicsif we knew the efficiency of an engine running between a certain temperature T and a certain arbitrary standard temperature, then we could work out the efficiency for any other difference in temperature
The Feynman Lectures on Physics Vol. I Ch. 44: The Laws of Thermodynamicsfirst law, the conservation of energy: if one has a system and puts heat into it, and does work on it, then its energy is increased by the heat put in and the work done
The Feynman Lectures on Physics Vol. I Ch. 44: The Laws of Thermodynamics