In an attempt to cool the kitchen a person leaves the refrigeratordoor open. In

Question

In an attempt to cool the kitchen a person leaves the refrigeratordoor open. In the long run, the temperature in the kitchen will

A)stay the same.
C)fall.
D)rise. Hint: If the refrigerator door is open, then both the input and theoutput end are in the room. It takes some heat from the room,does some work converting ordered energy into thermal energy, andthen vents the sum of these thermal energies back into theroom. The net effect is that more heat is put into the roomthan is taken out.

A)stay the same.
C)fall.
D)rise. Hint: If the refrigerator door is open, then both the input and theoutput end are in the room. It takes some heat from the room,does some work converting ordered energy into thermal energy, andthen vents the sum of these thermal energies back into theroom. The net effect is that more heat is put into the roomthan is taken out. Hint: If the refrigerator door is open, then both the input and theoutput end are in the room. It takes some heat from the room,does some work converting ordered energy into thermal energy, andthen vents the sum of these thermal energies back into theroom. The net effect is that more heat is put into the roomthan is taken out.

Explanation / Answer

Again, you have the answer at the end of your question - the neteffect is that more heat is put into the room than is taken out,i.e. the temperature of the room increases. Since both ends of thethermal cycle of the refrigerator are fixed to the temperature ofthe room, and since the refrigerator requires work to function, thework required to run the refrigerator is dumped into the room aswaste heat. Thus, the answer is D)Rise (where's answer B?).

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