Homework Help: physics

Posted by Jen on Sunday, December 2, 2007 at 8:34pm.

A Carnot engine is operated between two heat reservoirs at temperatures 520 K and 300 K. (a) If the engine receives 6.45 kJ of heat energy from the reservoir at 520 K in each cycle, how many joules per cycle does it reject to the reservoir at 300 K? (b) How much mechanical work is performed by the engine during each cycle? (c) What is the thermal efficiency of the engine?

physics - drwls, Monday, December 3, 2007 at 12:14am
For a Carnot engine,

Qin/Qout = Tin/Tout = 520/300 = 1.733

Wout = Qin - Qout = Qin[1 - Qout/Qin]
= Qin[1 - (Tout/Tin)] = ___
Efficiency = Wout/Qin = __

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