Problem

The temperature inside my freezer is –15°C and the room temperature in my kitchen is a con...

The temperature inside my freezer is –15°C and the room temperature in my kitchen is a constant 20 ºC. At 1 PM one afternoon the power goes off during an ice storm and the freezer’s internal temperature T(t) rises as follows for the next few hours:

Time (PM)

1

2

3

4

5

Temperature (º C)

–15.0

–13.3

–11.7

–10.1

–8.7

a. Assuming that u(t) = 20 – T(t) is an exponentially declining function, find the best fit of the form T(t) = 20 – a • e–kt.


b. The food in the freezer will begin to thaw once the temperature hits 0°C. When will this occur?

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Solutions For Problems in Chapter 4.3