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Q.

A liquid takes 5 min to cool from 80oC to 50oC. How much time will it take to cool from 60oC to 30oC? The temperature of the surrounding is 20oC.

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a

5 min

b

9 min

c

4 min

d

12 min

answer is B.

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Detailed Solution

According to Newton's law of cooling             θ1−θ2t=Kθ1+θ22−θ0so that 80−505=K80+502−20And      60−30t=K60+302−20Solving these for t, we get t = 9 min.
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