A body cools in 7 minutes from 60°C to 40° C. What time (in minutes) does it take to cool from 40° C to 28° C if the surrounding temperature is 10°C? Assume Newton's law of cooling hold?
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a
3.5
b
11
c
7
d
10
answer is C.
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Detailed Solution
In first case,60−407=K60+402−10 ....(1)In second case,40−28t=K40+282−10 ....(2)By solving t = 7 minutes