Questions
A liquid cools down from 70°C to 60°C in 5 minutes. The time taken to cool it from 60°C to 50°C will be
detailed solution
Correct option is C
According to Newton's law of cooling,Rate of cooling ∞ mean temperature differenceInitially, mean temperature difference=70+602−θ0=65−θ0Finally, mean temperature difference=60+502−θ0=55−θ0In second case, mean temperature difference decreases, so rate of fall of temperature decreases. Thus, it takes more time to cool through the same range.Talk to our academic expert!
Similar Questions
A body cools down from 60°C to 55°C in 30 s. Using Newton’s law of cooling, calculate the approximate time taken by same body to cool down from 5 5°C
to 50°C. Assume that the temperature of surroundings is 45°C.
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