A pitcher of buttermilk initially at 25°C is set out on the 10°C porch of Exercise. During the next half hour the following temperature readings are taken:
Time (PM) | 1 | 1:10 | 1:20 | 1:30 |
Temperature (°C) | 25 | 20 | 17 | 15 |
The buttermilk will be brought in and served when it has cooled to 12°C. When do you expect this to be?
Exercise
Suppose a hot cake like the one of Example 2 is taken out of an oven at 175°C and immediately set out on a cool porch where the temperature is 10 C. During the next hour the following temperature readings of the cake are taken:
Time (PM) | 5 | 5:20 | 5:40 | 6 |
Temperature (°C) | 175 | 125 | 85 | 60 |
The cake will be brought in and served when it has cooled to 35°C. When do you expect this to be?
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