The drawing (not to scale) shows the way in which the
Chapter , Problem 61(choose chapter or problem)
The drawing (not to scale) shows the way in which the pressure and volume change for an ideal gas that is used as the working substance in a Carnot engine. The gas begins at point a (pressure 5 Pa, volume 5 Va) and expands isothermally at temperature TH until point b (pressure 5 Pb, volume 5 Vb) is reached. During this expansion, the input heat of magnitude uQHu enters the gas from the hot reservoir of the engine. Then, from point b to point c (pressure 5 Pc, volume 5 Vc), the gas expands adiabatically. Next, the gas is compressed isothermally at temperature TC from point c to point d (pressure 5 Pd, volume 5 Vd). During this compression, heat of magnitude uQCu is rejected to the cold reservoir of the engine. Finally, the gas is compressed adiabatically from point d to point a, where the gas is back in its initial state. The overall process a to b to c to d to a is called a Carnot cycle. Prove for this cycle that uQCu/uQHu 5 TC/TH.
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