A body takes 4 minutes to cool from 100∘C
to 70∘C . To cool from 70∘C to 40∘C it will take
( room temperature is 15∘C )
7 minutes
6 minutes
5 minutes
4 minutes
θ1−θ2t=K(θ1+θ22−θ0)
∴100−704=K(100+702−15)=60K⇒K=18
Again 70−40t=18(70+402−15)=5⇒t=6min.
A body takes 4 minutes to cool from 100o C to 70o C. To cool from 70o C to 40o C it will take (room temperature is 15o C )
A liquid takes 5 minutes to cool from 800 C to 500 C . How much time will it take to cool from 600 C to 300 C ? The temperature of the surrounding is 200 C .
If a body takes 6 minutes to cool from 800C to 700C, how long will it take to cool from 600C to 500C, if the surrounding temperature is 250C?