2. A cup of coffee is made with boiling water at a temperature of 100 °C, in a room attemperature 20 °C. After two minutes it has cooled to 80 •C. (a)What is its temperatureafter five minutes? (b) When will the coffee drop to 40 °C and taste cold?

Given that: Initial temperature = 100oC Temperature after 2 minutes =80oC Surrounding temperature =…

Answered: A cup of coffee is made with boiling…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A cup of coffee is made with boiling water at a temperature of 100 oC, in a room at temperature 20 •C. After two minutes it has cooled to 80 °C. (a)What is its temperature after five minutes? (b) When will the coffee drop to 40 °C and taste cold?