A refrigerator is situated in an insulated room; it has a 2-hp motor that drives a compressor. Over a 30 minute period of time the refrigerator dumps 8000 kJ of heating from the coils on its back to the room. Calculate the increase in internal energy in the system if the system is the room without the refrigerator. Calculate the increase in internal energy in the system if the system is the room with the refrigerator. How much heat is carried away from the space containing the food inside the refrigerator if the internal energy of the refrigerator (the solid structure) is unchanged during the process?