# A roast turkey is taken from an oven when its temperature has reached 180^o F and is placed on a ...

## Question:

A roast turkey is taken from an oven when its temperature has reached {eq}180^o F {/eq} and is placed on a table in a room where the temperature is {eq}75^o F {/eq}. (Round your answer to the nearest whole number.)

a. If the temperature of the turkey is {eq}150^o F {/eq} after half hour, what is the temperature after {eq}60 {/eq} minutes?

b. When will the turkey have cooled to {eq}95^o {/eq}?

## Newton's Cooling Law

Newton's cooling law is an exponential function that models the temperature of an object over time when placed in an environment with constant temperature. It is of the form

{eq}T(t) = T_s + (T_i- T_s)e^{-kt} {/eq}

where {eq}T_s {/eq} is the temperature of the surroundings, {eq}T_i {/eq} is the initial temperature of the object and k is the cooling constant. It can be seen that the change in temperature of an object is related to the difference between the initial temperature of the object and the temperature of the surroundings.

## Answer and Explanation:

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The temperature of the roast turkey can be modeled using Newton's cooling law equation,

{eq}\displaystyle T(t) = T_s + (T_i- T_s)e^{-kt} {/eq}.

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