Problem Two:

A $2-$mm$-$diameter and $12-$cm$-$long aluminum fin $(k=237\frac{W}{m}*K)$ is attached to a Marks$)$ heat transfer coefficient is $15\frac{W}{m^2}*K,$ determine the percent error in the rate of heat transfer from the fin when the infinitely long fin assumption is used instead of the adiabatic fin tip assumption.