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Q.

A body is allowed to cool in still air. Its temperature falls from 70oC to 64oC in 5 minutes and then from 64oC to 60o in another 5 minutes. Assuming Newton's Law of cooling is valid, find the temperature of air.

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a

48oC

b

42oC

c

56oC

d

52oC

answer is D.

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Detailed Solution

70−645=C70+642−θ0and 64−605=C64+602−θ0∴ 64=67−θ062−θ0⇒θ0=52oC
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