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Q.

A body cools in 7 minutes from 60oC to 40oC. The temperature of the surrounding is 10oC. The temperature of the body after the next 7 minutes will be:

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a

28oC

b

34oC

c

32oC

d

30oC

answer is A.

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Detailed Solution

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dθdr∝θ1+θ22−θ0⇒2040−θ=50−1040+θ2−10⇒20+θ=160−4θ⇒5θ=140⇒θ=28∘C

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