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If you are going to have an assistant create tactile graphics for this module, you will need to download the file named Phy1070.zip , which contains the svg files for this module. Extract the svg files from the zip file and provide them to your assistant.
In each case where I am providing an svg file for the creation of tactile graphics, I will identify the name of the appropriate svg file and display animage of the contents of the file for the benefit of your assistant. As explained here , those images will be mirror images of the actual images so that your assistant can emboss the image from the back ofthe paper and you can explore it from the front.
Also in those cases, I will provide a table of key-value pairs that explain how the Braille keys in the image relate to text or objects in the image.
Let's begin this section with a short exercise involving uniform velocity.
How long does it take an airplane traveling at a uniform velocity of 350 miles per hour to traverse a distance of 700 miles?
Please copy the code shown in Listing 1 into an html file and open the file in your browser.
| Listing 1 . A simple exercise on uniform velocity. |
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<!---------------- File JavaScript01.html ---------------------><html><body><script language="JavaScript1.3">document.write("Start Script" + "</br>")
var velocity = 350;//uniform velocity in miles/hourvar distance = 700;//miles
var time = distance/velocity;//miles/(miles/hour) = hoursdocument.write("uniform velocity = " + velocity +
" miles/hour</br>");
document.write("distance = " + distance + " miles</br>");
document.write("time = " + time + " hours</br>");
document.write("End Script")</script></body></html> |
Screen output
The text shown in Figure 1 should appear in your browser window when you open the html file in your browser.
| Figure 1 . Screen output for Listing #1. |
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Start Script
speed = 350 miles/hourdistance = 700 miles
time = 2 hoursEnd Script |
Analysis of the code
The equation given earlier that shows the relationship among uniform velocity, distance, and time can be manipulated algebraically tofind any one of the three terms when the values of the other two terms are known. The objective in this exercise is to find the time required to traverse a known distance witha known uniform velocity.
Algebraic manipulation of the equation
Multiplying both sides of the equation by t and dividing both sides by v allows us to rewrite the equation as
t = s/ v
where
The solution to the problem is...
This version of the equation is used in Listing 1 to solve for the time required to traverse 700 miles at a uniform velocity of 350 miles/hour. Theanswer is 2 hours as shown in Figure 1 .
Declare and initialize variables
The code in Listing 1 begins by declaring and initializing variables named velocity and distance . Note that the units are shown in the comments. I recommend that you always dothat in order to keep the units straight.
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