At 1:00PM, a thermometer reading 70oF is taken outside where the air temperature is -10oF. At 1:02PM, the reading is 26oF. At 1:05PM, the thermometer is taken back indoors, where the air is at 70oF. What is the temperature reading at 1:09PM?
The Attempt at a Solution
At t=0, u=70F, temp.env.=-10F
At t=2, u=26F.
At t=5 u=? env=70F
At t=9, u=?
at t=0, c=80F
at t=2, u=26, k=-0.39925
Giving me the u value which is 0.86729
After that, I don't know what to do next. :|
I actually tried letting u=0.86729 and k=-0.39925 when t=0. And after doing the same process, I ended up having u=60.608F but the answer should be 58F.
Is there any shortcut or pattern in obtaining the answer to this kind problems?