Homework

This page provides links to Homework assignments. Some assignments may also have hints or partial solutions.

Homework assignments must follow the standard format. You can read about. the format on another web page.

Contents


Problem Set 8: Not collected, for practice only

To prepare for the final exam, look at the following problems from the textbook: 14-24C, 14-25C, 14-32, 14-66C, 14-67C, 14-69E, 14-73. The problems labeled with a "C" are conceptual, and should not take long to solve.

You can download problems 14-24C, 14-25C, 14-32, 14-66C, 14-67C, 14-69E and 14-73 as a PDF file or a PNG image. The PNG image is reproduced here:

Students in the class can download the solutions.


Problem Set 7: Due 15 March 2007

I have a dilemma assigning the homework problems. I do not have a copy of the fourth edition of the textbook. There is no guarantee that the problems are the same in the fourth and fifth editions. My solution is to post the complete text of the problems here. A pain, yes, but a workable solution until I can get my hands on a copy of the fourth edition.

Do the following problems. The problem numbers refer to the fifth edition.

13-10 The composition of moist air is given on a molar basis to to be 78 percent N2, 20 percent O2, and 2 percent water vapor. Determine the mass fractions of the constituents of air.
13-15 A gas mixture consists of 8 kmol of H2 and 2 kmol of N2. Determine the mass of each gas and the apparent gas constant of the mixture. Answers: 16 kg, 56 kg, 1.155 kJ/kg/K
13-33 A rigid tank contains 0.5 kmol of Ar and 2 kmol of N2 at 250 kPa and 280 K. The mixture is now heated to 400 K. Determine the volume of the tank and the final pressure of the mixture.
13-36 A 0.3-m3 rigid tank contains 0.6 kg of N2 and 0.4 kg of O2 at 300 K. Determine the partial pressure of each gas and the total pressure of the mixture. Answers: 178.1 kPa, 103.9 kPa, 282.0 kPa

Also do textbook problems 14.18, 14.27, and 14.29. The problem numbers refer to the fifth edition. You can download problems 14.18, 14.27, 14.29 as a PDF file or a PNG image. The PNG image is reproduced here:

Students in the class can download the solutions.


Problem Set 6: Due 6 March 2007

Do textbook problems: 11.6, 11.7, 11.32, 11.36, 11.46

Students in the class can download the solutions.


Problem Set 5: Due 27 February 2007

Do textbook problems: 12.12, 12.15, 12.19, 12.22, 12.23, 12.30

Students in the class can download the solutions.

Students who invest a little effort in my (admittedly) poorly documented (but still useful) MATLAB Toolbox for Pipe Flow Analysis (zip archive) can obtain an answer without having to do so many repetitive manual calculations. If you use the toolbox in your homework solution you should (1) print the source code for your MATLAB function (not the rest of the toolbox) and (2) provide a manual calculation for at least one operating point of the system, i.e. one flow rate.

Hint: the demoSysBalance function in the toolbox solves Example 12.4 in Munson, Young, and Okiishi. The toolbox was mentioned in the notes to Lecture 5.

The following table gives the point distribution for the problem set.

ProblemMax. Points
12.1215
12.155Not graded
12.1920
12.225Not graded
12.2325
12.3010
Total80

The problems marked "Not graded" are worth 5 points if you provide a complete solution. The grader will not check those problems for accuracy. The intention is to give you more practice solving problems without making the work too great for the grader. If you are concerned about getting the most points for your effort, do the "not graded" problems last. Those "not graded" problems are good problems, so don't skip them altogether.


Problem Set 4: Due 8 February 2007

Do textbook problems 8.107, 9.10, 9.22, 9.30

Students in the class can download the solutions.


Problem Set 3: Due 1 February 2007

Do textbook problems 8.64, 8.71, 8.76, 8.97

Hint on problem 8.76: apply the steady flow energy equation twice. One application of the energy equation is between the pressure gage and the pipe exit.

Students in the class can download the solutions.


Problem Set 2: Due 25 January 2007

Do textbook problems 8.12, 8.16, 8.28, 8.38, 8.45, 8.46
Equation 8.12 may be helpful

Students in the class can download the solutions.

The following table gives the point distribution for the problem set.

ProblemMax. Points
8.125Not graded
8.1610
8.2815
8.385Not graded
8.4512
8.4615
Total62

Problems marked "Not graded" are worth 5 points and will not be checked in detail. These problems are worthwhile because they will teach you something, just like the other problems. However, to make it feasible for the grader to provide some feedback on some problems, we do not grade all problems to the same level of detail. The "Not graded" category rewards you for the effort of turning in a complete assignment, without promising that we have checked your work carefully. If you turn in a "Not graded" problem that is sloppy or incomplete or blatantly wrong, then you won't get the full 5 points.


Problem Set 1: Due 16 January 2007

Do textbook problems 6.3, 6.8, 6.10, 8.1, 8.2, 8.5.
Hint on 8.5: Equation (8.1) or (8.2) will be helpful.

Students in the class can download the solutions.


Sample Grading Rubric

A sample scoring rubric for Problem set 1 in EAS 361 is shown in the following image. The student got 45 out of 49 points for the technical aspect of the assignment. However, because the student did not follow the assignment format, and additional 2 points were deducted from the final score. The student also made a serious error (or errors) in engineering reasoning in spite of getting the "correct" numerical answer. The final score on the assignment is 38 out of a possible 49 points.

Scoring rubric