The temperature in an electric oven is 153 °C. The temperature at the outer surface in the kitchen is 35.5 °C. Theoven (surface area = 1.46 m2) is insulated with materialthat has a thick ness of 0.0139 m and a thermal conductivity of0.0129 J/(s m C°). (a) How much energy is usedto operate the oven for 6.42 hours? (b) At a price of $0.10 per kilowatt-hour for electrical energy, what is the cost(in dollars) of operating the oven?