00:01
All right, so let's say we have three processes on a pv diagram.
00:05
We have a constant pressure process.
00:08
And then we have an isothermal process, kind of like this, and then a constant volume process.
00:13
So we're told this pressure is 1 .4, and presumably these are in bars.
00:19
And then let's see, this volume v1 and cubic meters is, let's see, 0 .02 .1.
00:31
8 and then this volume right here is see we're not told what it is but we're told the work done through this process we'll call it delta w here is like negative 10 .5 thousand joules and then we have our isothermal process and let's see what else and then the constant volume process where the change in internal energy is negative 26 .4 thousand joules so we're going to find the network for the whole cycle.
01:09
All right.
01:10
So let's find this volume, uh, p2.
01:12
We know that p times delta v should equal negative 10 .5 ,000 joules.
01:22
Um, all right.
01:24
Sorry, it should be a positive.
01:25
The work is negative, but p times delta v is positive under this convention.
01:29
So this is 140 ,000, uh, pascal's times, uh, v2, minus 0 .028 cubic meters, and this is 10 ,500 joules.
01:45
So v2 then is going to be 0 .103 cubic meters.
01:52
And then from there, we can find the work done, because the work done for an isothermal process is going to be like p times v times the logarithm of the final volume over the initial volume...