# 2.7 Game 2302-0370 motion -- uniform and relative velocity  (Page 7/11)

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Store the resulting magnitude in the array object

Once the array object is created, the code in the function shown in Listing 3 is essentially the same as the code used earlier to add two vectors, down to thestatement that begins with:

vecResult[0] = Math.sqrt(Math.pow(vecResultH,2) +...

That statement computes the magnitude of the resultant vector the same way as before, but instead of storing the value of the magnitude in a variable, it isstored in the first pigeon hole of the array object.

The value is directed into the first pigeon hole (technically called element) by the "[0]" that you see following the name of the array object in that statement.

Store the resulting angle in the array object

Immediately thereafter, the statement in Listing 3 that reads

vecResult[1] = getAngle(vecResultH,vecResultV);

computes the angle for the resultant vector and stores it in the second element in the array object (the element identified by the index value 1).

Return the array object for use later

These same index values along with the square brackets "[ ]" will be usedlater to retrieve the magnitude and angle values from the array object.

Finally, the function returns the array object to the calling script by executing the statement that reads

return vecResult;

The main script body

The main script body begins where indicated by the comment in Listing 3 .

The first four statements establish values for the magnitude and direction of the two vectors that represent the train and the man. There is nothing in thosestatements that you haven't seen before.

Note the treatment of the units

However, I encourage you to pay attention to the treatment of units in the comments for the value stored in the variable named vecManMag . The arithmetic in that statement uses two different conversion factors toconvert the value from feet per second to miles per hour.

Once again, working through the units in this fashion can help you to organize your arithmetic correctly.

Call the vectorSum function

The statement that begins

var resultant = vectorSum(vecTrainMag...

calls the new vectorSum function to add the two vectors, passing the magnitude and angle for each vector as parameters.

Store the returned array object in a variable

This statement also declares a new variable named resultant . The array object that is returned from the vectorSum function is stored in this variable.

Once this statement finishes executing, the magnitude and angle of the resultant vector have been computedand saved for later use. (In this script, the only use of those two values is to display them later. However, they will be used in a more significant way inanother exercise later.)

Code to display the results

The call to the vectorSum function is followed by three calls to the document.write method. The first two calls display magnitude and angle values, and the third call simply displays some text to indicate that the script has finishedexecuting.

Displaying the magnitude value

If you examine the statement containing the first call to the document.write method, you will seethat the argument list contains the following expression:

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
Do somebody tell me a best nano engineering book for beginners?
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
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