The thermal characteristics of a small dormitory refriderator are determined by performing two separate experemints, each with the door closed and the refridgerator placed in ambient air at T (inf)=25 deg C. In one case an electric heater is suspended in the fridge cavity, while the fridge is is unplugged. With the heater dissipating 20 W a steady state temperature of 90 deg C is recorded within the cavity. With the heater removed and now in operation the second experiment involves maintaining a steady state cavity temperature of 5 deg C for a fixed time interval and recording the electrical energy required to operate the fridge. In such an experiment for which steady state operation is maintaned over a 12 hour period, the input electrical energy is 125,000 J. Determine the fridges coefficient of performance COP.