- #1
Vrbic
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Homework Statement
For how long you have to let bottle in a river, if you want to cool a liquid inside from 22 °C to 12 °C, when river is 8 °C?
Homework Equations
Q=cm(T1-T2), Qc=l*S(T-Triver)/d *t
The Attempt at a Solution
I know how to solve it for a case when we substitute in equation Qc for conduction of heat T by average temperature of bottle from starting and finishing state. But I believe it should be possible to solve it as a differential equation for changing "T" in Qc. But I don't know how to find out dependency T(t), t- time. Or should I do it some other way?
Thank you for your help and advice.