Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

4.3 Homework Presentation 95

4.3 Homework Presentation

Engineering paper is specially formatted for use by engineers and engineering students. The

paper has three cells on the top that may be used to convey such information as course number,

assignment due date, and your name. A given problem may be divided into a “Given” section,

a “Find” section, and a “Solution” section. It is a good practice to draw horizontal lines to sep-

arate the known information (Given section) from the information that is to be found (Find

section) and the analysis (Solution section), as shown in Figure 4.1. Do not write anything on

the back of the paper. The grid lines on the back provide scale and an outline for freehand

sketches, tables, or plotting data by hand. The grid lines, which can be seen from the front of

the paper, are there to assist you in drawing things or presenting tables and graphical informa-

tion on the front of the page neatly. These grid lines also allow you to present a freehand engi-

neering drawing with its dimensions. Your engineering assignments will usually consist of many

problems, thus you will present your work on many sheets, which should be stapled together.

Professors do not generally like loose papers, and some may even deduct points from your assign-

ment’s total score if the assignment sheets are not stapled together. The steps for presenting an

engineering problem are demonstrated in Example 4.1. If you are presenting solutions to simple

problems and you think you can show the complete solution to more than one problem on one

page, then separate the two problems by a relatively thick line or a double line, whichever is

more convenient for you.

Example 4.1 Determine the mass of compressed air in a scuba diving tank, given the following informa-

tion. The internal volume of the tank is 10 L and the absolute air pressure inside the tank is

20.8 MPa. The temperature of the air inside the tank is 20C. Use the ideal gas law to analyze

this problem. The ideal gas law is given by

PVmRT

where

Pabsolute pressure of the gas, Pa

Vvolume of the gas, m

3

mmass, kg

Rgas constant,

Tabsolute temperature, Kelvin, K

The gas constantRfor air is 287 J/ kgK. At this time, do not worry about understanding the

ideal gas law. This law will be explained to you in detail in Chapter 11. The purpose of this

example is to demonstrate how a solution to an engineering problem is presented. Make sure

you understand and follow the steps shown in Figure 4.2.

J

kg#K

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