A 0.3 -m-diameter, 5 -mm-thick horizontal copper disk is heated from below at a rate of \(70 \mathrm{~kW}\). The top of the disk is polished, and exposed to a water bath at atmospheric pressure. Determine the maximum disk temperature when nucleate boiling is occurring. In an effort to reduce the temperature of the copper disk, a 1 -mm-thick nickel coating is applied to the top of the disk, which in turn reduces the value of \(C_{s, f}\). Calculate the maximum temperature of the coated disk. Does the coating reduce the maximum copper temperature? Neglect any contact resistance between the copper substrate and the nickel coating.