Waves Practice Problem Set Worksheet Page 37
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34
ECHANICS
RACTICE
ROBLEM
ETS
4
A refrigerator has a coefficient of performance of 2.10. In each cycle it absorbs 3.40x10
J of heat from the cold reservoir.
a. How much mechanical energy is required each cycle to operate this
refrigerator?
Answer: 16200 J
b. During each cycle, how much heat is discarded to the high-temperature
reservoir?
Answer: 50,200 J
11. A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat
at this temperature in each cycle and gives up 335 J to the low-temperature reservoir.
a. How much mechanical work does the engine perform during each cycle?
Answer: 215J
b. What is the thermal efficiency of the cycle?
Answer: 39%
c. What is the temperature of the low temperature reservoir? Answer: 378 K
Gamzon & Gregorian-Michaelsen
6/7/16
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