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I am having trouble attacking this problem properly and getting the right solution, which I do not have. (only know I did it wrong on exam).

Anyway, there is picture attached this is a cycle of some working material that has a total energy of U= alpha*T^4

I need to determine:

To solve it is going to use this or?

So not sure if in total calculation should take in mind changes in p, T and V or what? Becuase T is changing always?

Anyway, thanks for help if anyone has solution :

I am having trouble attacking this problem properly and getting the right solution, which I do not have. (only know I did it wrong on exam).

Anyway, there is picture attached this is a cycle of some working material that has a total energy of U= alpha*T^4

I need to determine:

- Change of total energy from 1 to 2.

- Heat that came from 3 to 1.

To solve it is going to use this or?

Code:

`$(\frac{\partial U}{\partial V})\cdot dV + (\frac{\partial U}{\partial T})\cdot dT + (\frac{\partial U}{\partial p})\cdot dp$`

So not sure if in total calculation should take in mind changes in p, T and V or what? Becuase T is changing always?

Anyway, thanks for help if anyone has solution :

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