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Two friends sit down to talk and enjoy a cup of coffee.
Chapter 3, Problem 12E(choose chapter or problem)
Problem 12E
Problem
Two friends sit down to talk and enjoy a cup of coffee. When the coffee is served, the impatient friend immediately adds a teaspoon of cream to his coffee. The relaxed friend waits 5 min before adding a teaspoon of cream (which has been kept at a constant temperature). The two now begin to drink their coffee. Who has the hotter coffee? Assume that the cream is cooler than the air and use Newton’s law of cooling.
Questions & Answers
QUESTION:
Problem 12E
Problem
Two friends sit down to talk and enjoy a cup of coffee. When the coffee is served, the impatient friend immediately adds a teaspoon of cream to his coffee. The relaxed friend waits 5 min before adding a teaspoon of cream (which has been kept at a constant temperature). The two now begin to drink their coffee. Who has the hotter coffee? Assume that the cream is cooler than the air and use Newton’s law of cooling.
ANSWER:
Solution
Step 1:
Given:Two friends sit down to talk and enjoy a cup of coffee.After served the coffee the impatient friend immediately adds a teaspoons of cream to his coffee.The relaxed friend waits 5 min before adding a teaspoon of cream(which has been kept at a constant temperature).The two now begin to drink their coffee.
By assuming that the cream is cooler than the air and by using Newton’s law of cooling.