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**1. Homework Statement**

The PV diagram below (I will describe it) shows a cycle for 4.87moels of an ideal gas. The path ab is along an isothermal line.

Pressure is in atm and volume in m

^{3}

Point a: (.08, 6)

Point b: (.24,2)

Point c: (.08, 2)

Find the ideal and the actual efficiency of the cycle

**2. Homework Equations**

1atm=101,300Pa

PV=nRT

1-T

_{L}/T

_{H}=[itex]\epsilon[/itex]

[itex]\epsilon[/itex]

_{actual}=W

_{out}/Q

_{in}

**3. The Attempt at a Solution**

First of all, convert the pressures in atm to Pascals, to make life easier.

The temperature at a and b is 1,200K, the temperature at c is 400K. (found with PV=nRT)

so i thought that plugging that into 1/T

_{L}/T

_{H}=[itex]\epsilon[/itex] would give me the ideal efficiency. I got 67%

However, I don't know how to get the actual efficiency. I don't know what Qin and Wout are exactly