Mathematics High School

After heating up in a teapot, a cup of hot water is poured at a temperature of 201^\circ201 ∘ F. The cup sits to cool in a room at a temperature of 67^\circ67 ∘ F. Newton's Law of Cooling explains that the temperature of the cup of water will decrease proportionally to the difference between the temperature of the water and the temperature of the room, as given by the formula below: T=T_a+(T_0-T_a)e^{-kt} T=T a ​ +(T 0 ​ −T a ​ )e −kt T_a=T a ​ = the temperature surrounding the object T_0=T 0 ​ = the initial temperature of the object t=t= the time in minutes T=T= the temperature of the object after tt minutes k=k= decay constant The cup of water reaches the temperature of 190^\circ190 ∘ F after 3 minutes. Using this information, find the value of kk, to the nearest thousandth. Use the resulting equation to determine the Fahrenheit temperature of the cup of water, to the nearest degree, after 5 minutes. Enter only the final temperature into the input box.

Answers

Answer 1

The Fahrenheit temperature of the cup of water after 5 minutes is approximately 194°F.

According to Newton's Law of Cooling, the temperature of an object decreases proportionally to the difference between its temperature and the surrounding temperature. The formula is given as:

T = T_a + (T_0 - T_a) * e^(-kt)

In this case, T_a represents the temperature of the room (67°F), T_0 represents the initial temperature of the water (201°F), t represents time in minutes, T represents the temperature of the water at a given time, and k is the decay constant we need to find.

We know that after 3 minutes, the temperature of the water reaches 190°F. Plugging in these values into the equation:

190 = 67 + (201 - 67) * e^(-3k)

Simplifying the equation:

123 = 134 * e^(-3k)

Dividing both sides by 134:

e^(-3k) = 123/134

Taking the natural logarithm of both sides:

-3k = ln(123/134)

Dividing both sides by -3:

k ≈ ln(123/134) / -3 ≈ -0.0104

Now that we have the value of k, we can use the equation to determine the temperature of the water after 5 minutes:

T = 67 + (201 - 67) * e^(-0.0104 * 5)

Calculating the expression:

T ≈ 67 + 134 * e^(-0.052)

T ≈ 67 + 134 * 0.9492

T ≈ 67 + 127.2268

T ≈ 194.23°F

Therefore, the Fahrenheit temperature of the cup of water after 5 minutes is approximately 194°F.

For more information on Fahrenheit temperature visit: brainly.com/question/32120238

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