In the previous problem, the electrical power required to maintain the heater at To = 25°C depends on the thermal conductivity of the wall material k, the thermal contact resistance R_t,c, and the convection coefficient h. Compute and plot the separate effect of changes in k (1 < k < 200 W/m ∙ K), R_t,c (0 < R_t,c < 0.1 m ∙ K/W), and h (10 < h < 1000 W/m² ∙ K) on the total heater power requirement, as well as the rate of heat transfer to the inner surface of the tube and to the fluid.