(a) What is the best coefficient of performance for a refrigerator that cools an environment at - 30.0oC and has heat transfer to another environment at 45.0oC?

(b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment?

(c) What is the cost of doing this if the work costs 10.0 cents per 3.60 × 106 J (a kilowatt-hour)?

(d) How many kJ of heat transfer occurs into the warm environment?

(e) Discuss what type of refrigerator might operate between these temperatures.