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Reisel - Engineering Thermodynamics (SI) 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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1/1 1/1 1/1 2/2 3/3 3/3 6/6 6/6 6/6 2/2
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31/31 (100.0%)

  • Instructions

    Principles of Engineering Thermodynamics (SI Edition), 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 627C, (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.

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Your last submission is used for your score.

1. 1/1 points  |  Previous Answers ReiselEngTherm2SI 3.2.005. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
Water at 200°C occupies a volume of 0.014 m3. The mass of the water is 0.1466 kg. The specific volume of saturated liquid water,
vf,
 at 200°C is 0.001156 m3/kg, while the specific volume of saturated water vapor,
vg,
 is 0.1274 m3/kg. Determine the quality of the saturated mixture.
Correct: Your answer is correct. seenKey

0.747
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2. 1/1 points  |  Previous Answers ReiselEngTherm2SI 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 4.0 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.

Correct: Your answer is correct.
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3. 1/1 points  |  Previous Answers ReiselEngTherm2SI 3.5.019. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
Nitrogen gas with a mass of 8.5 kg has a pressure of 250 kPa and a temperature of 550 K. Determine the volume (in m3) occupied by the nitrogen gas, assuming ideal gas behavior. (For nitrogen gas,
R = 297 Pa · m3/(kg · K).)
Correct: Your answer is correct. seenKey

5.55

 m3
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4. 2/2 points  |  Previous Answers ReiselEngTherm2SI 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 0.40 kg of oxygen is initially at 445 kPa and 280 K. The oxygen expands in an isobaric process until its volume is 0.37 m3. 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 kJ. For oxygen at this temperature,
R = 0.2598 kPa · m3/(kg · K),
cp = 0.918 kJ/(kg · K),
 and
cv = 0.658 kJ/(kg · K).)
change in total internal energy Correct: Your answer is correct. seenKey

343

 kJ change in total enthalpy Correct: Your answer is correct. seenKey

479

 kJ
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5. 3/3 points  |  Previous Answers ReiselEngTherm2SI 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 ReiselEngTherm2SI 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 0.85 kg, is initially at 627°C. In a cooling process, the internal energy of the air is reduced by 190 kJ. (Enter all answers in °C.)
(a)
Determine the final temperature of the air if the specific heat is considered constant, with its value taken at 627°C.
Correct: Your answer is correct. seenKey

359

 °C
(b)
Determine the final temperature of the air if the specific heat is considered constant, with its value taken at 177°C.
Correct: Your answer is correct. seenKey

322

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

357

 °C
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7. 6/6 points  |  Previous Answers ReiselEngTherm2SI 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 ReiselEngTherm2SI 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 kPa) of nitrogen gas at a specific volume of 0.010 m3/kg and a temperature of the following.
(a)
600 K (Assume Z = 1.15.)
P (Z factor) = Correct: Your answer is correct. seenKey

20500

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

17800

 kPa
(b)
300 K
P (Z factor) = Correct: Your answer is correct. seenKey

9080

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

8900

 kPa
(c)
150 K
P (Z factor) = Correct: Your answer is correct. seenKey

3520

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

4450

 kPa
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9. 6/6 points  |  Previous Answers ReiselEngTherm2SI 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)
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
(c)
1,200 K
ideal gas law v = Correct: Your answer is correct. seenKey

0.142

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

0.142

 m3/kg
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10. 2/2 points  |  Previous Answers ReiselEngTherm2SI 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 8,890 kg/m3 and a specific heat of 0.387 kJ/kg · K. Consider that a block of copper undergoes a process that increases its pressure and temperature from 101 kPa and 300 K to 7 MPa and 520 K. Determine the change 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 kJ/kg. Round your answers to at least one decimal place.)
Δu = Correct: Your answer is correct. seenKey

85.14

 kJ/kg Δh = Correct: Your answer is correct. seenKey

85.92

 kJ/kg
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