On a hot day, you are in a sealed, insulated room. The room contains a refrigera

Question

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 253 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 330 K when this process starts, and the temperature in the cold compartment of the refrigerator be 258 K. At what net rate is heat added to (+) or subtracted from (?) the room and all of its contents?
___________ W

Explanation / Answer

55.2 W

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