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.
154 Views
Can heat energy be converted into work without a temperature difference?
No, without a temperature difference, heat energy cannot be converted into work.
According to the second law of thermodynamics, heat energy cannot be converted into work till some heat is rejected into the surroundings.
In order to reject the heat we require a body at a lower temperature and not at the same temperature.
Alternatively:
We know,
If T1 – T2 = 0, then W = 0
i.e. no heat can be converted into work without a temperature difference.
135 Views
The temperatures of source and sink of a Carnot engine are 300°C and 300K. Find the efficiency of the engine.
Temperature of source,
Temperature of sink,
The efficiency of Carnot engine is given by,
169 Views
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.
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