thermo_exam1_sol

thermo_exam1_sol - ENGRD 221 Thermodynamics(Prof N Zabaras...

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ENGRD 221 –Thermodynamics (Prof. N. Zabaras) Prelim 1 10/11/2007 Page 2 of 9 K. If Q C = 1400 kJ and W cycle = 140 kJ, does this cycle operate reversibly, irreversibly, or is it impossible? a. Reversibly b. Irreversibly c. It is impossible Answer: 5 250 300 250 max = = = c h c T T T β and 10 140 1400 = = = cycle c W Q , since max > this is impossible, so the answer is (c). Problem 2 (5 points) 1.2 kg of liquid water initially at 15 ° C is to be heated to 95 ° C in a teapot equipped with a 1200 W electric heating element inside. The specific heat of water can be taken to be 4.18 kJ/kg. ° C, and the heat loss from the water during heating can be neglected. The time it takes to heat the water to the desired temperature is approximately:
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This note was uploaded on 01/28/2009 for the course ENGRD 2210 taught by Professor Torrance during the Fall '08 term at Cornell.

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thermo_exam1_sol - ENGRD 221 Thermodynamics(Prof N Zabaras...

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