# 2.5 Game 2302-0350 units and dimensional analysis  (Page 9/10)

 Page 9 / 10

## Free fall exercise

Please copy the code from Listing 2 into an html file and open it in your browser.

Listing 2 . Free fall exercise.
```>!-- File JavaScript02.html --<>html<>body<>script language="JavaScript1.3"<//Function to compute free-fall distance for a given time // in seconds.function distance(time){ var g = -32.174; //acceleration of gravity in feet/sec^2var d = 0.5 * g * time * time;//(feet/sec^2)*sec^2 = feet return new Number(d.toFixed(0));}//end function //Compute and display height at ten seconds.var t1 = 10;//time in seconds var d1 = distance(t1);//distance traveled in feetvar h1 = 10000 + d1;//height in feet document.write("At " + t1 + " seconds:" +"<br/>"); document.write("distance traveled = " + d1 +" feet<br/>") document.write("height = " + h1 +" feet<br/>") //Compute and display height at twenty seconds.var t2 = 20;//time in seconds var d2 = distance(t2);//distance traveled in feetvar h2 = 10000 + d2;//height in feet document.write("<br/>At " + t2 + " seconds:" +"<br/>"); document.write("distance traveled = " + d2 +" feet<br/>") document.write("height = " + h2 +" feet<br/>") document.write("<br/>The End")>/script<>/body<>/html<```

Screen output

When you open the html file in your browser, the text shown in Figure 6 should appear in your browser window.

Figure 6 . Screen output for Listing #2.
```At 10 seconds: distance traveled = -1609 feetheight = 8391 feet At 20 seconds:distance traveled = -6435 feet height = 3565 feetThe End```

As you can see from Figure 6 , after ten seconds, the rock will have traveled a distance of -1609 feet. (The minus sign indicates downwardmotion.)

Adding this value to the initial height of 10000 feet produces a value of 8391 for the height of the rock at the end of 10 seconds.

Similarly, Figure 6 gives us 3565 for the height of the rock at 20 seconds.

Analysis of the code

The code in Listing 2 begins by defining a function that computes and returns the distance traveled for a rock falling toward the earth for a given timeinterval since release assuming that the initial velocity was zero (the rock was simply dropped).

This function implements the equation shown earlier, and expects to receive the time as an input parameter. It returns thedistance traveled during that time interval.

Note that the interaction of units is shown in the comments with the result that the returned value is in feet.

Call the function twice in succession

Then the code calls that function twice in succession for two different time intervals (10 seconds and 20 seconds) to determine the distance traveled duringeach time interval.

In both cases, the distance traveled is added to the initial height of 10000 feet to determine the height of the rock at the end of the time interval.

Also, in both cases, the time interval, the distance traveled, and the resulting height of the rock above the ground are displayed as shown in Figure 6 .

Note again that in all cases, the interactions of the various units are shown in the comments.

## A plotting exercise

Let's do another exercise and this time plot the results.

where we get a research paper on Nano chemistry....?
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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