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
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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.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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