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Why we live in vacuum
@1:Conservation of mechanical energy
- conservation of mechanical energy.jpg (93.41 KiB) Viewed 5655 times
In goo dungeon,there are some swinging axes.
As you may have noticed,it swings endlessly.
This is a demonstration of conservation of mechanical energy.
Mechanical energy is the sum of potential energy and kinetic energy.
You do not necessarily need to understand what it is to follow.
Just remember,if mechanic energy is conserved,object moves forever (or occasionally,stay at rest forever)
As the axe swings endlessly,it means its mechanical is conserved(amount never change)
However,air resistance dissipates mechanical energy.
Therefore,we can conclude that air does not exist.
@2:Projectile
You may want to check this for better picture.
viewtopic.php?f=5&t=413
As I stated before,air resistance dissipates mechanical energy.
The real projectile of an arrow does not follow what is shown in that post.
For instance,the vertex is not the axis of symmetry.
According to standard form and h-k formula of quadratic equations.
y=a(x-h)^2+k
y=a(x-(-b/2a))^2+(b^2-4ac/-4a)
Here,the x-coordinate of the vertex is -b/2a
In the graph,the non-zero x-intercept is -b/a
Therefore,the x-intercept is two times of the x-coordinate of the vertex.
Though in reality,the arrow does not travel horizontally two times of the distance it did when it reached the vertex.
The range of arrow shows that air resistance does not exist,so is air.
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Meanwhile,there are reasons that prove that air does exist.
Why we do not live in vacuum
@1:Terminal velocity
We accelerate toward the core of the earth.
When in air,there is nothing to support us.
As a result,we should be accelerating downward forever until we hit something.
This is not true in this game.
We can notice that even we fall freely,we do not accelerate downward forever.
After a while,we no longer accelerate and fall at a constant velocity.
This is the terminal velocity.
The existence of terminal velocity means there is something that refrains us from accelerating.
That is the air resistance.
As we fall faster and faster,the air resistance becomes stronger and stronger.
Eventually,we can no longer gain velocity by gravitational pull.
In short,existence of terminal velocity means the existence of air resistance,which is a force of air itself.
@2:Combustion
- fire.jpg (11.66 KiB) Viewed 5655 times
Oxygen is required in combustion.
Without it,the reaction is lacking one of the essential elements.
While I do not know how the weapon burns,
I think it would be safe to conclude that oxygen is present for combustion.
Therefore,this is another evidence for existence of air.
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From the above cases,we can see that there is contradiction between the existence of air and lack of air.
I know there are more examples for supporting either side but I do not feel like explaining.
All in all,which side do you choose?
Why do you think so?
Any example to back up?
Time to bring in some ideas.
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References
http://en.wikipedia.org/wiki/Mechanical_energy
http://en.wikipedia.org/wiki/Projectile
http://en.wikipedia.org/wiki/Combustion