According to Newton’s law of cooling, the rate of change of temperature is proportional to the temperature difference between the system and its surroundings:dT/dt= -α(T-Tsur)where Tsur is the temperature of the surroundings and α is a constant. (a) Integrate this equation with the initial condition that T = Ti at t = 0.(b) Given that the entropy varies with temperature according to S(T) − S(Ti) = C ln(T/Ti), where Ti is the initial temperature and C the heat capacity, deduce an expression entropy of the system at time t.

Elements Of Electromagnetics
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According to Newton’s law of cooling, the rate of change of temperature is proportional to the temperature difference between the system and its surroundings:
dT/dt= -α(T-Tsur)
where Tsur is the temperature of the surroundings and α is a constant. (a) Integrate this equation with the initial condition that T = Ti at t = 0.
(b) Given that the entropy varies with temperature according to S(T) − S(Ti) = C ln(T/Ti), where Ti is the initial temperature and C the heat capacity, deduce an expression entropy of the system at time t.

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