# Computer Problems for ES Classes

## at New Mexico Tech

For all computer problems in these courses, don't just turn in the computer printout. Rather, start with a cover sheet that describes the problem and shows the steps leading to the solution. Use an editor like Notepad in Windows 95 or Emacs in Unix to write a Matlab program to solve the given problem. Start by copying a previous problem and making the necessary changes. Include the code to create a plot if necessary. Run your program in Matlab. Your name, date, and subject must appear on the printout and plots. Be sure the units are shown in the tables. See the Matlab Help page for details. Also see the Carnegie Mellon help pages.

Be sure to use vectors rather than loops where appropriate. Then you must use .* and ./ rather than simply * and / when a vector follows the operator and .^ not simply ^ for taking the power of a vector. Copy the Matlab output data from the screen and paste it into the bottom of your source program. Print your source program with the appended output. Print out the plot if required. Staple the package with cover sheet, source program with solution, and any plots. Fold vertically and put you name and class on the outside.

## Reference Books

The following books provide a different viewpoint to engineering design than you get in the lectures and labs. You might want to consider purchasing them at Amazon Books. They are also available at the Tech library.

1. Structures, Or Why Things Don't Fall Down,(1988) Da Capo Pr, ISBN: 0306801515, \$12.76, J. E. Gordon, TA645 .G65 1981
2. Design Paradigms, Case Histories of Error and Judgment in Engineering, (1994) Cambridge Univ Pr, ISBN: 0521466490, \$21.95, Henry Petroski, TA174 .P473 1994
3. To Engineer Is Human, The Role of Failure in Successful Design, (1992), Vintage Books, ISBN: 0679734163, \$10.40, Henry Petroski

The first and most indispensable design tool is judgment. Engineering judgment does not necessarily come from a deeper understanding of theory or a more powerful command of computational tools. The single most important source of judgment lies in learning from one's mistakes and those of others. -- Henry Petroski (From reference 2 above)

# ES 201, Statics

Computer assignments

1. Pulley Problem, Problem 2.65, Page 44, due Sep 8, 1999
2. Parallel-Force Problem, Problem 3.127, Page 140, due Sep 29, 1999
3. Shear and Bending Moment Problem, Problem 7.36, Page 357, due Nov 24, 1999
4. Friction Problem, Problem 8.15, Page 410, due Dec 3, 1999

# ES 302, Strength of Materials

Computer assignments

1. Axial Deflection and Stress, Problem 2.13, Page 57, due February 7, 2000
2. Torsional Rotation and Stress, Problem 3.C1, Page 181, due February 25, 2000
3. Plane Stress and Rotation, Problem 6.C1, Page 407, due March 24, 2000
4. Principal Stresses and Mohr's Circle, Problem 6.C2, Page 407, due March 27, 2000