- #1

issacnewton

- 980

- 22

Hi

Here is a small problem. I already got the answer for part a. I have question about the part b.

For finding the heat energy input/output in each process from A to A, can't we use the

formula for the specific heat of the gas.

[tex] Q=m\, c \, (\Delta T) [/tex]

But if we use that , I get [itex] Q_{net} =0 [/itex] for the whole cycle.

That could not be correct, since I am getting net work done as

[tex]W_{net}=-4P_i V_i [/tex]

Since in a thermodynamic cycle, we must have

[tex] \Delta E_{int} = 0[/tex]

we deduce that

[tex]Q_{net}=-W_{net} = 4 P_i V_i [/tex]

So what's wrong with my beginning approach to Q

Here is a small problem. I already got the answer for part a. I have question about the part b.

For finding the heat energy input/output in each process from A to A, can't we use the

formula for the specific heat of the gas.

[tex] Q=m\, c \, (\Delta T) [/tex]

But if we use that , I get [itex] Q_{net} =0 [/itex] for the whole cycle.

That could not be correct, since I am getting net work done as

[tex]W_{net}=-4P_i V_i [/tex]

Since in a thermodynamic cycle, we must have

[tex] \Delta E_{int} = 0[/tex]

we deduce that

[tex]Q_{net}=-W_{net} = 4 P_i V_i [/tex]

So what's wrong with my beginning approach to Q

_{net}?