Which of the following is an example of something not allowed by the second law of thermodynamics? Indicate true or false.
1.All refrigerators can be made perfect
2.A spoon in a hot drink spontaneously stirring the drink
3.All the molecules suddenly moving to one place in a room
4.A perfect refrigerator
Moving heat from a cold place to a hotter place with the use of some work
2 answers
Nevermind I got it =]
II'm not sure what is meant by a "perfect" refrigerator. It is possible to have a refrigerator what does not require work. The use an external heat source. See
http://www.dometicusa.com/refrigerators.php
Stirring a cup requires energy, and wuld violate the first law.
Molecules CAN gather in part of a room, but the probability is infinitesimal.
http://www.dometicusa.com/refrigerators.php
Stirring a cup requires energy, and wuld violate the first law.
Molecules CAN gather in part of a room, but the probability is infinitesimal.