Q$4.$ A hot surface at $120C$ is to be cooled by attaching $3-$cm$-$long, $0\mathrm{.}25-$cm$-$diameter copper fins $(k=242\frac{W}{m}C)$ to it$,$ with a center$-$to$-$center distance of $0\mathrm{.}6$ cm $.$ The temperature of the surrounding medium is $25C,$ and the heat transfer coefficient on the surfaces is $35\frac{W}{m^2}C.$ Determine the rate of heat transfer from the surface for a $1-mx1-m$ section of the finned plate and the overall effectiveness of the fins.