SP01-06

SP01-06 - ME300 Spring 2011 - Special Problems SP1 a) A cup...

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1 ME300 Spring 2011 - Special Problems SP1 a) A cup of coffee gets colder in a room. Will the kinetic energy in the coffee become larger, smaller, or remain the same. b) A refrigerator has been working steadily in a well-insulated room for a long time with the refrigerator door always opened. Will the room air temperature increase, decrease, or remain the same? c) Water is compressed from 1 atm to 10 atm. Neglect kinetic and potential energy changes. Which one would need more work input, water liquid or water vapor? SP2 One kg of water-vapor mixture exists in an insulated piston-cylinder arrangement. Initially, the water is a mixture of saturated liquid and vapor at 100 kPa with a quality of 0.11. The paddle wheel is turned on, and the mass-less piston begins to lift as additional liquid is vaporized. At state 2, the piston hits the stops. The paddle-wheel continues to operate until the water is completely vaporized at state 3, the end of the process. V 3 = V 2 = 2.0 * V 1 . The ambient conditions are: 0 300 TK , 0 1 p bar .
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SP01-06 - ME300 Spring 2011 - Special Problems SP1 a) A cup...

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