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15

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PAGE: 453SET: ExercisesPROBLEM: 15
Please look in your text book for this problem Statement

The initial temperature of the cool drink is .

Room temperature is .

After  minutes temperature increased to then .

Newtons Law of Cooling : .

The change in temperature : .

Here is the temperature of the cool drink and is the surrondings temperatuture.

At the intital time : .

.

The general equation is .

Temperature of the cool drink at time is .

Substitute and in the equation .

.

Temperature of the cool drink at time minutes is .

Substitute in the above equation.

.

.

Find the temperature after minutes.

Temperature of the cool drink at time is .

Substitute   and in the above equation.

Substitute in the equation .

The temperature after minutes is .

(b).

Find the time when the temperature is .

.

The temperature is after minutes.

(a) The temperature after minutes is .

(b) The temperature is after minutes.



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