Q.
body cools from 50°C to 49°C in 5 s. How long will it take to cool from 40°C to 39°C? Assume temperature of surroundings to be 30°C and Newton's law of cooling is valid:
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a
2.5 s
b
10 s
c
20 s
d
5 s
answer is B.
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Detailed Solution
θ1-θ2t=Kθ1+θ22-θ0
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