How Do You Calculate Efficiency in a Carnot Cycle Involving Argon?

[stonecoldgen]

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, 3.6X10⁵)
b=(3X10^-3, 1.8X10⁵)
c=(1.5X10^-3, 1.8X10⁵)

Homework Equations

Q=mc$\Delta$T

$\Delta$U=Q+W

$\epsilon$=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 I am not sure what to use for the Qs.

 

[RTW69]

What is Q_s supposed to represent? I don't see it in your problem statement.

 

[stonecoldgen]

What is Q_s supposed to represent? I don't see it in your problem statement.

it's a plural for Q, I am not sure what to use for Q_in and Q_out

 

[RTW69]

Remember this is NOT a carnot cycle. η= 1- Q_out/Q_in There is also a Q_in between A and B. Do you know what it is? It is the Q_out/ the Total Q_in.