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Q.

Certain quantity of water cools from 70oC to 60oC in the first 5 minutes and to 54oC in the next 5 minutes. The temperature of the surroundings is

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a

42oC

b

10oC

c

20oC

d

45oC

answer is D.

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Detailed Solution

θ1-θ2t=kθ1+θ22-θ0 70-605=k70+602-θ0 .....(i) 60-545=k60+542-θ0 .....(ii) (1)(2)=106=65-θ057-θ0, θ0=45oC

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