If the door of refrigerator is kept open will it cool the room?
If the door of the refrigerator is kept open, the room will not be cooled but the temperature of the room will rather increase because refrigerator takes less heat from the space inside the refrigerator and rejects more cold atmosphere to the room.
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Why is it impossible for a ship to use the internal energy of the seawater to run?
A ship cannot use the internal energy of sea water to run because there is no suitable sink of lower temperature so that internal energy can be converted into mechanical work. Hence, it is impossible.