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Reisel - Engineering Thermodynamics 2/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 31 / 31

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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Question
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1 2 3 4 5 6 7 8 9 10
1/1 1/1 1/1 2/2 3/3 3/3 6/6 6/6 6/6 2/2
Total
31/31 (100.0%)

  • Instructions

    Principles of Engineering Thermodynamics, 2nd Edition, by John R. Reisel and published by Cengage with WebAssign digital resources, transforms how students learn thermodynamics with a presentation that makes abstract concepts easier to understand. The author emphasizes fundamental principles in practice, while challenging students to explore the impact of contributing parameters on the performance of devices or processes. Students learn both how to apply thermodynamics and how different concepts of thermodynamics are interrelated. Students also learn to create computer-based models of devices, processes, and cycles as well as use Internet-based programs and computer apps to find thermodynamic data. WebAssign customizable digital solution helps your students further master key concepts.

    Question 1 determines the quality of a saturated mixture of water when given temperature, volume, and mass.

    Question 2 asks to plot the volume occupied by refrigerant as a function of quality.

    Question 3 determines the volume occupied by a nitrogen gas, assuming ideal gas behavior.

    Question 4, assuming oxygen behaves as an ideal gas with constant specific heats, determines the change in total internal energy and total enthalpy.

    Question 5 determines the values of cv, the molecular mass, and the gas-specific ideal gas constant for xenon.

    Question 6 determines the final temperature of air if (a) the specific heat is considered constant, with its value taken at 900F, (b) the specific heat is considered constant, with its value taken at a randomized temperature, and (c) the specific heat is considered to be variable, when given mass and initial temperature, as well as how much the internal energy is reduced in a cooling process.

    Question 7, using the ideal gas law and the compressibility factor, determines the temperature of oxygen gas at a specific volume and pressure.

    Question 8, using the ideal gas law and the compressibility factor, determines the pressure of nitrogen gas at a specific volume and temperature.

    Question 9, using both the ideal gas law and the van der Waals equation, determines the specific volume of carbon dioxide at a specific pressure and temperature.

    Question 10 determines the change in specific internal energy and specific enthalpy for a block of copper that undergoes a process that increases its pressure and temperature (without neglecting the pressure terms in the enthalpy calculation) when given density and specific heat. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 1/1 points  |  Previous Answers ReiselEngTherm2 3.2.005. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
Water at 300°F occupies a volume of 0.15 ft3. The mass of the water is 0.0378 lbm. The specific volume of saturated liquid water,
vf,
 at 300°F is 0.01745 ft3/lbm, while the specific volume of saturated water vapor,
vg,
 is 6.472 ft3/lbm. Determine the quality of the saturated mixture.
Correct: Your answer is correct. seenKey

0.612
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2. 1/1 points  |  Previous Answers ReiselEngTherm2 3.2.012. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
A refrigerant at 140 kPa has
vf = 0.01 m3/kg
 and
vg = 0.15 m3/kg.
 The refrigerant at 140 kPa has a mass of 5.0 kg. Plot the volume occupied by the refrigerant as a function of quality for values of the quality ranging between 0.0 and 1.0.

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3. 1/1 points  |  Previous Answers ReiselEngTherm2 3.5.019. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
Nitrogen gas with a mass of 1.5 lbm has a pressure of 500 psi and a temperature of 600 R. Determine the volume (in ft3) occupied by the nitrogen gas, assuming ideal gas behavior. (For nitrogen gas,
R = 0.3830 psi-ft3/lbm-R.)
ft3
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4. 2/2 points  |  Previous Answers ReiselEngTherm2 3.5.028. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
Consider that 0.55 lbm of oxygen is initially at 75 psi and 50°F. The oxygen expands in an isobaric process until its volume is 2.7 ft3. Assuming the oxygen behaves as an ideal gas with constant specific heats, determine the change in total internal energy and total enthalpy of the oxygen during the process. (Enter your answers in Btu. For oxygen at this temperature,
R = 0.3353 psi · ft3/(lbm · R),
cp = 0.219 Btu/(lbm · R),
 and
cv = 0.157 Btu/(lbm · R).)
change in total internal energy Correct: Your answer is correct. seenKey

50.8

 Btu total enthalpy Correct: Your answer is correct. seenKey

70.8

 Btu
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5. 3/3 points  |  Previous Answers ReiselEngTherm2 3.5.035. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
2/100 2/100 2/100
Total
3/3
 
Neon is a noble gas and as such has constant specific heats, whose ratio is a constant 1.667. For neon,
cp
 is 0.246 kJ/(kg · K). Determine the values of cv (in kJ/(kg · K)), the molecular mass (in kJ/mole), and the gas-specific ideal gas constant (in kJ/(kg · K)) for neon.
specific heat cv Correct: Your answer is correct. seenKey

0.148

 kJ/(kg · K) molecular mass Correct: Your answer is correct. seenKey

84.5

 kJ/mole ideal gas constant Correct: Your answer is correct. seenKey

0.0984

 kJ/(kg · K)
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6. 3/3 points  |  Previous Answers ReiselEngTherm2 3.5.046. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
2/100 2/100 2/100
Total
3/3
 
Air, with a mass of 6.9 lbm, is initially at 900°F. In a cooling process, the internal energy of the air is reduced by 440 Btu. (Enter all answers in °F.)
(a)
Determine the final temperature of the air if the specific heat is considered constant, with its value taken at 900°F.
Correct: Your answer is correct. seenKey

566

 °F
(b)
Determine the final temperature of the air if the specific heat is considered constant, with its value taken at 200°F.
Correct: Your answer is correct. seenKey

531

 °F
(c)
Determine the final temperature of the air if the specific heat is considered to be variable.
Correct: Your answer is correct. seenKey

550

 °F
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7. 6/6 points  |  Previous Answers ReiselEngTherm2 3.5.050. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
1/1 1/1 1/1 1/1 1/1 1/1
2/100 2/100 2/100 2/100 2/100 2/100
Total
6/6
 
Using the ideal gas law and the compressibility factor, determine the temperature (in K) of oxygen gas at a specific volume of 0.010 m3/kg and pressures of the following.
(a)
5,000 kPa
T (Z factor) = Correct: Your answer is correct. seenKey

219

 K T (ideal) = Correct: Your answer is correct. seenKey

192

 K
(b)
10,000 kPa
T (Z factor) = Correct: Your answer is correct. seenKey

393

 K T (ideal) = Correct: Your answer is correct. seenKey

385

 K
(c)
20,000 kPa (Assume
Z = 1.02.)
T (Z factor) = Correct: Your answer is correct. seenKey

755

 K T (ideal) = Correct: Your answer is correct. seenKey

770

 K
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8. 6/6 points  |  Previous Answers ReiselEngTherm2 3.5.051. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
1/1 1/1 1/1 1/1 1/1 1/1
2/100 2/100 2/100 2/100 2/100 2/100
Total
6/6
 
Using the ideal gas law and the compressibility factor, determine the pressure (in psi) of nitrogen gas at a specific volume of 0.12 ft3/lbm and a temperature of the following.
(a)
750 R
P (Z factor) = Correct: Your answer is correct. seenKey

2510

 psi P (ideal) = Correct: Your answer is correct. seenKey

2390

 psi
(b)
500 R
P (Z factor) = Correct: Your answer is correct. seenKey

1530

 psi P (ideal) = Correct: Your answer is correct. seenKey

1600

 psi
(c)
250 R
P (Z factor) = Correct: Your answer is correct. seenKey

527

 psi P (ideal) = Correct: Your answer is correct. seenKey

798

 psi
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9. 6/6 points  |  Previous Answers ReiselEngTherm2 3.5.061. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
1/1 1/1 1/1 1/1 1/1 1/1
2/100 2/100 2/100 2/100 2/100 2/100
Total
6/6
 
Carbon dioxide has a pressure of 1,600 kPa. Using both the ideal gas law and van der Waals equation, determine the specific volume of the CO2 for temperatures of the following. (Enter all answers in m3/kg.)
(a)
400 K
ideal gas law v = Correct: Your answer is correct. seenKey

0.0472

 m3/kg van der Waals equation v = Correct: Your answer is correct. seenKey

0.0457

 m3/kg
(b)
800 K
ideal gas law v = Correct: Your answer is correct. seenKey

0.0945

 m3/kg van der Waals equation v = Correct: Your answer is correct. seenKey

0.0942

 m3/kg
(c)
1,000 K
ideal gas law v = Correct: Your answer is correct. seenKey

0.118

 m3/kg van der Waals equation v = Correct: Your answer is correct. seenKey

0.118

 m3/kg
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10. 2/2 points  |  Previous Answers ReiselEngTherm2 3.6.067. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
Copper has a density of 555 lbm/ft3 and a specific heat of 0.0925 Btu/(lbm · R). Consider that a block of copper undergoes a process that increases its pressure and temperature from 14.7 psi and 540 R to 450 psi and 655 R. Determine the changes in specific internal energy and specific enthalpy for the copper in this process. Do not neglect the pressure terms in the enthalpy calculation. (Enter your answers in Btu/lbm. Round your answers to at least one decimal place.)
Δu = Correct: Your answer is correct. seenKey

10.64

 Btu/lbm Δh = Correct: Your answer is correct. seenKey

10.78

 Btu/lbm
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