On a hot day, you are in a sealed, insulated room. The room contains a refrigerator, operated by an electric motor. The motor does work at the rate of 250 W when it is running. Assume the motor is ideal (no friction or electrical resistance) and that the refrigerator operates on a reversible cycle. In an effort to cool the room, you turn on the refrigerator and open its door. Let the temperature in the room be 320 K when this process starts, and the temperature in the cold compartment of the refrigerator be 256 K. At what net rate is heat added to (+) or subtracted from (−) the room and all of its contents?