Problem 2 H 4). The Newton's Law of Cooling says that the rate at which a body cools is proportional to the difference between the temperature of the body and the temperature of the surrounding medium. Le., if we let T(t) be the temperature of the body at time t and Tm denotes the temperature of the surrounding medium, then T(t) = k(T(t)- Tm) (1) for some constant k. Suppose the room temperature is 70° F and a cake is 300° F when removed from an oven. Three minutes later the cake is 200° F. How long will it take to cool the cake to 75° F? [Hint: From (1), the function T(t) is not exponentially decaying; however, consider the function H(t) = T(t)- Tm, and is H(t) an exponentially decaying function?]

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Problem 2 H 51). The Newton's Law of Cooling says that the rate at which a body cools is proportional to
the difference between the temperature of the body and the temperature of the surrounding medium. I.e., if we
let T(t) be the temperature of the body at time t and Tm denotes the temperature of the surrounding medium,
then
T()
T(t)=k(T(t)- Tm)
(1)
for some constant k.
Suppose the room temperature is 70° F and a cake is 300° F when removed from an oven. Three minutes
later the cake is 200° F. How long will it take to cool the cake to 75° F? [Hint: From (1), the function T(t)
is not exponentially decaying; however, consider the function H(t) = T(t) - Tm, and is H(t) an exponentially
decaying function?]
Transcribed Image Text:Problem 2 H 51). The Newton's Law of Cooling says that the rate at which a body cools is proportional to the difference between the temperature of the body and the temperature of the surrounding medium. I.e., if we let T(t) be the temperature of the body at time t and Tm denotes the temperature of the surrounding medium, then T() T(t)=k(T(t)- Tm) (1) for some constant k. Suppose the room temperature is 70° F and a cake is 300° F when removed from an oven. Three minutes later the cake is 200° F. How long will it take to cool the cake to 75° F? [Hint: From (1), the function T(t) is not exponentially decaying; however, consider the function H(t) = T(t) - Tm, and is H(t) an exponentially decaying function?]
Expert Solution
Step 1: Define the problem

By Newton's Cooling Law fraction numerator d T over denominator d t end fraction equals k open parentheses T minus T subscript m close parentheses

rightwards double arrow k= Proportionality constant 

rightwards double arrow T subscript m equalsTemperature of the surrounding 

rightwards double arrow T equalsTemperature of the cake


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