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Question
A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is ______.
Options
`10/13`t
`5/13`t
`13/10`t
`13/5`t
MCQ
Fill in the Blanks
Solution
A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is `13/5`t.
shaalaa.com
Newton’s Law of Cooling
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