00:01
So for this problem, we're asked to correctly select the statement for the first law of thermodynamics, right? if kinetic and potential energy changes are negligible.
00:12
Now, the first law of thermodynamics states that the change in the internal energy of the system is equal to the heat added to the system minus the work done, right? right.
00:28
So we have our total energy.
00:41
Change in energy is represented by our heat done to the system.
00:45
Right.
00:45
So our temperature t, whatever you want to call it, or h minus our work done, which is w.
00:53
Right.
00:55
And this is applicable to closed thermodynamic cycles where the system returns to an initial state.
01:02
Hence, the net heat transfer minus the work done equals the internal energy change.
01:10
Now, looking at our answers, we see that a doesn't really say that completely, as it only talks about heat transfer.
01:22
But we know that for the first law of thermodynamics, we have to have some kind of work done, right? right...