A hot surface at $190C$ is to be cooled by attaching $3-cm-$long, $0\mathrm{.}25-cm-$diameter aluminum pin fins $(k=237\frac{W}{m}*K)$ to it$,$ with a center$-$to$-$center distance of $0\mathrm{.}6$ cm $.$ The temperature of the surrounding medium is $30C,$ and the heat transfer coefficient on the surfaces is $35\frac{W}{m^2}*K.$ Determine the rate of heat transfer from the surface for a $1-m1-m$ section of the plate. Also determine the overall effectiveness of the fins.

The total rate of heat transfer is $$ kW$.$

The fin effectiveness is $$