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Grade 9Modern Physics

A hot liquid takes 5 minutes to cool from 70(degree)C to 60(degree)C. the time taken by the same liquid to cool from 60(degree)C to 59(degree)C will be(take surrounding temperature is 20(degree)C)

theja

12 Years agoGrade 9

1 Answer

Arun Kumar

12 Years ago

$T(t)=T_{A}+(T_{H}-T_{A})e^{-kt}$

$60-20=50e^{-k5}=>40=50^{-k5}$

$39=40e^{-kt}$

Equation is set just take log and divide to get the answer.

Arun Kumar

IIT Delhi

Askiitians Faculty

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