Ts = T surrounding
(T(t) -Ts)/ (To-Ts) = e^-kt
ln [ (T(t) -Ts)/ (To-Ts)] = - k T
I would convert those F temps to C and add 273 to get absolute temps
A whole roast chicken is taken from the oven when its temperature reached 185 degrees Fahrenheit. It is then placed on a table where the room temperature is 75 degrees Fahrenheit. After thirty minutes, the temperature of the viand is 150 degrees Fahrenheit. After 45 minutes more, what is the temperature of the roast chicken (in Fahrenheit)?
2 answers
Since the temps were given in Fahrenheit, there's no real reason to convert to Celsius or Kelvin. Whichever scale you use, it just means a different value for k.