Homework Help: Phyics

Posted by Physics on Wednesday, July 21, 2010 at 3:37pm.

A Carnot engine has 200 g of helium as its working substance and operates between two reservoirs which are at temperatures of 500C and 30C. The initial volume of the gas is 20 litres while the volume after isothermal expansion is 60 litres.
  For one complete cycle, determine :
    A. the heat absorbed from the hot reservoir

can anyone tell me where to start with this?
imn really lost

Phyics - drwls, Wednesday, July 21, 2010 at 4:30pm
In a Carnot cycle, heat is absorbed from the reservoir at a constant temperature, which in this case is 500 C.

The heat absorbed from the reservoir per cycle at 500 C is T*(change in entropy)

Compute the change in entropy during heat absorption.
Phyics - Oisin, Thursday, July 22, 2010 at 11:18am
How is the change in entory calculated?

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