00:01
So for this question, we have a 30 gram sample of water at 280 kelvin.
00:06
It is mixed with 50 grams of water at 330 kelvin.
00:10
We want to calculate the final temperature of the mixture assuming no heat is lost to the surroundings.
00:17
So we have two samples of water.
00:19
We have one sample of water that is 30 grams at 280 kelvin.
00:26
And then we have a second sample of water that is 50 grams at 330 kelvin.
00:32
And now we're going to mix them together.
00:35
Well, one of the things that we always have to think about is that heat is always going to move from one that is higher temperature to one that is the lower temperature.
00:45
So that means we're going to see a heat flow from the 50 gram water to the 30 gram water.
00:54
So that means that when we're calculating heat, we're going to use q equals mc delta t.
01:01
So the cooler water is going to take in the heat.
01:05
So that's why i'm going to look at that as a positive q...
