Heat TransferEasy
Question
A body cools in 7 min from 60oC to 40oC. What will be it′s temperature after the next 7min. The temperature of surrounding is 10oC :-
Options
A.20oC
B.25oC
C.28oC
D.30oC
Solution
Acc. to Newton′s Law of cooling
60 - 4θ′ = 20 + θ′ ⇒ 5θ′ = 140 ⇒ θ′ = 28oC
60 - 4θ′ = 20 + θ′ ⇒ 5θ′ = 140 ⇒ θ′ = 28oC
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