Estimate the yearly cost (in dollars) of operating a refrigerator whose walls, door, floor and ceiling have an R-factor of 14 (imperial units), if the electricity rate is $0.15 per kWh. Assume that 1 J of electrical energy supplied to the fridge causes 1 J of heat to be removed from the inside of the fridge. The size of the fridge is 1.06 m by 1.06 m by 1.66 m; the inside of the fridge is at 4.00 °C, and the outside is at 19.3 °C.

Question