A refrigerator extracts 1200J of heat per cycle from a cold compartment at 270K and rejects it to the surroundings at 300K. Assume ideal (reversible) performance.
(a) Calculate the maximum possible coefficient of performance (COP).
(b) Determine the minimum work that must be supplied to the refrigerator per cycle.
(c) Find the amount of heat rejected to the surroundings per cycle.