# 2.3 Scr0130: sequence, selection, and loop  (Page 5/9)

 Page 5 / 9

## Program code for the LeftBeachball

The code that I wrote (by dragging blocks into the center pane) for the sprite named LeftBeachball is shown in Image 6 .

You are already familiar with the tan block with the green flag shown in Image 6 because you learned about it in a previous module. However, theblue block in Image 6 has not been used prior to this module.

## Adding the blue go to block to the program

The blue block shown in Image 6 was added to the program module by:

• Clicking the dark blue button labeled Motion in the upper left of Image 4 . (See Image 13 for all of the programming blocks belonging to the Motion group.)
• Dragging the blue block shown in Image 6 from the left panel to the center panel and clicking it into place under the tan block.
• Typing the literal values -200 and 0 into the two white boxes on the blue block.

## Coordinate values

If you move the mouse pointer around in the user interface, the coordinates of the mouse pointer are displayed at the rightend of the gray area immediately below the Stage as shown in Image 4 . The x coordinates range from -240 at the left to +240 at the right. The ycoordinates range from +180 at the top to -180 at the bottom.

## Behavior of the LeftBeachball

The behavior of the program module shown in Image 6 can be interpreted as follows: When the user clicks the green flag, cause the sprite named LeftBeachball to move to a location with an x (horizontal) coordinate value of -200 and a y (vertical) coordinate value of 0. Since the origin is at the center of the Stage, this causes the beach ball to move to theleft of the origin on the horizontal axis.

## Some experimentation was required

Because I didn't know the diameter of the beach ball, I had to experiment to determine how far to move it to the left of the origin to locate it at the leftside of the Stage as shown in Image 4 . I settled on a value of -200 for the x coordinate and a value of 0 for the y coordinate.

## Positioning the other beach ball

In the interest of brevity, I won't show the code required to position the beach ball on the right side of the Stage. I did exactly the same thing for that beach ballexcept that I specified the value of the x coordinate to be 200 instead of - 200. This causes the beach ball named RightBeachball to move to the right side of the Stage when the user clicks the green flag.

## Initializing the position of the basketball

Image 7 shows a portion of the center pane after clicking on the sprite named Basketball .

You will note that the tan block and the uppermost blue block in Image 7 arethe same as in Image 6 except that the x coordinate value is set to 0. This causes the basketball to move to the origin when the user clicks the greenflag.

## Initializing the orientation of the basketball

However, Image 7 contains a block that is not contained in Image 6 . The bottom blue block in Image 7 is used to set the orientation of the basketball. (By orientation, I mean the direction that the basketball is facing.)

find the 15th term of the geometric sequince whose first is 18 and last term of 387
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hmm well what is the answer
Abhi
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20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
Commplementary angles
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Sherica
im all ears I need to learn
Sherica
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Tamia
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Uday
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China
Cied
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I start with an easy one. carbon nanotubes woven into a long filament like a string
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many many of nanotubes
Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
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what is system testing
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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
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name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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not now but maybe in future only AgNP maybe any other nanomaterials
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Hello
Uday
I'm interested in Nanotube
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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