Math Problem Statement
Suppose that a cup of coffee begins at 172◦ F and after sitting in room temperature of 66◦ F for 14 minutes, the coffee reaches 165◦ F.
The differential equation is T(t) = 106e^(1/14ln(99/106)t+66
How long will it take before the coffee reaches 154 degrees? Include at least 2 decimal places in your answer.
? minutes
Solution
To solve this problem, let's work with the given differential equation:
where:
- is the temperature of the coffee at time ,
- ,
- the coffee cools to after minutes in a room temperature of ,
- and we want to find the time when the coffee temperature reaches .
Step-by-Step Solution
-
Set up the equation for :
-
Isolate the exponential term:
-
Divide by 106:
-
Take the natural logarithm of both sides to solve for :
-
Isolate :
-
Calculate :
- First, find .
- Then, find .
- Divide these results to get .
After performing the calculations, you will get:
So, it will take approximately 33.62 minutes for the coffee to cool to .
Would you like more details or have any questions?
Related Questions:
- How does the room temperature affect the cooling rate of the coffee?
- How would the solution change if the initial temperature of the coffee was different?
- How does Newton's Law of Cooling apply to this problem?
- What would be the temperature of the coffee after 45 minutes?
- If the room temperature increased, how would that affect the time to reach 154 degrees?
Tip:
When dealing with exponential decay or growth problems, carefully isolate the variable using logarithmic properties.
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Math Problem Analysis
Mathematical Concepts
Exponential Decay
Logarithmic Functions
Differential Equations
Newton's Law of Cooling
Formulas
T(t) = 106e^(1/14 * ln(99/106) * t) + 66
t = ln(88/106) / (1/14 * ln(99/106))
Theorems
Newton's Law of Cooling
Suitable Grade Level
Grades 11-12
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