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## Homework Statement

its part VI) of a big problem, where:

0.12 moles of argon (40) undergoes the cycle abca described in the graph. Process ab lies on a 540k isotherm.

In the previious 5 sub problems, i figured that:

T

_{c}=270k

Q

_{bc}=670J (lost)

Q

_{ca}=400J (added)

W

_{ab}=370J

W

_{abca}=100J

The PV diagram has points a,b and c where:

a=(1.5X10

^{-3}, 3.6X10

^{5})

b=(3X10

^{-3}, 1.8X10

^{5})

c=(1.5X10

^{-3}, 1.8X10

^{5})

## Homework Equations

Q=mc[itex]\Delta[/itex]T

[itex]\Delta[/itex]U=Q+W

[itex]\epsilon[/itex]=1-Q

_{out}/Q

_{in}=1-T

_{low}/T

_{high}

## The Attempt at a Solution

So it's basically using Q

_{abca}to find the efficiecy. The thing is that im not sure what to use for the Qs.