15. The temperature Tc of the cold reservoirs and the temperatures Tuof the hot reservoirs for four Carnot heat engines are. Engine 1: Tem400 K and TH= 500 K Engine 2: Te= 500 K and TH = 600 K Engine 3: Te-400 K and TH = 600 K Engine 2: Te= 600 K and TH = 800 K Rank these engines according to their efficiencies, least to greatest. a. 1,2, 3, 4 b. I and 2 ties, then 3 and 4 ties c. 2, 1, 4, 3 d. 1, 2, 4, 3

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Chapter15: Thermodynamics
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Problem 27PE: This problem compares the energy output and heat transfer to the environment by two different types...
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15. The temperature Tc of the cold reservoirs and the temperatures THof the hot reservoirs for
four Carnot heat engines are.
Engine 1: Te=400 K and TH = 500 K
Engine 2: Tc= 500 K and TH = 600 K
Engine 3: Te-400 K and TH= 600 K
Engine 2: Te= 600 K and TH = 800 K
Rank these engines according to their efficiencies, least to greatest.
a. 1, 2, 3, 4
b.
1 and 2 ties, then 3 and 4 ties
c. 2, 1, 4, 3
d. 1, 2, 4, 3
16. A container filled with a sample of an ideal gas at the pressure of 1.5 atm. The gas is
compressed isothermally to one-fourth of its original volume. What is the new
pressure of the gas?
a. 3 atm
b. 4 atm
c. 5 atm
d. 6 atm
17. The value of y
with increase in the degree of freedom of an ideal
gas
a. Increases
b. Decreases
c. Remains constant
d. All the above
18. An air conditioner takes air from a room at 70 F and transfers it to the outdoors,
which is at 95 «F. For each joule of electrical energy required to run the refrigerator,
how many joules of heat are transferred from the room?
a. 18J
b.
19 J
с. 201
d. 21 J
Transcribed Image Text:15. The temperature Tc of the cold reservoirs and the temperatures THof the hot reservoirs for four Carnot heat engines are. Engine 1: Te=400 K and TH = 500 K Engine 2: Tc= 500 K and TH = 600 K Engine 3: Te-400 K and TH= 600 K Engine 2: Te= 600 K and TH = 800 K Rank these engines according to their efficiencies, least to greatest. a. 1, 2, 3, 4 b. 1 and 2 ties, then 3 and 4 ties c. 2, 1, 4, 3 d. 1, 2, 4, 3 16. A container filled with a sample of an ideal gas at the pressure of 1.5 atm. The gas is compressed isothermally to one-fourth of its original volume. What is the new pressure of the gas? a. 3 atm b. 4 atm c. 5 atm d. 6 atm 17. The value of y with increase in the degree of freedom of an ideal gas a. Increases b. Decreases c. Remains constant d. All the above 18. An air conditioner takes air from a room at 70 F and transfers it to the outdoors, which is at 95 «F. For each joule of electrical energy required to run the refrigerator, how many joules of heat are transferred from the room? a. 18J b. 19 J с. 201 d. 21 J
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