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(C) The correct option is $C$.$A$ refrigerator works as a heat pump that extracts heat from its interior and rejects it into the surrounding environme

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Ultimately warm the room slightly

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(C) The correct option is $C$.$A$ refrigerator works as a heat pump that extracts heat from its interior and rejects it into the surrounding environment (the room).When the door is open,the refrigerator continues to extract heat from the room air and releases it back into the room along with the heat generated by the electrical work done by the compressor.Since the compressor performs work on the system,the total energy released into the room is the sum of the heat extracted and the work done by the motor.Therefore,the net effect is an increase in the total thermal energy of the room,which ultimately warms the room slightly.

By opening the door of a refrigerator placed inside a room,you:

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