The number 13 seems to be a special number, why is it that way, it apears almost everywhere. Its an unlucky number for some, its a turn on for others. I seem to come accross is almost every where.

Is it some kind of a freak of a number, does it do anything for you??? or is it just part of ma madness???

http://en.wikipedia.org/wiki/13_%28number%29

The number 13 seems to be a special number, why is it that way, it apears almost everywhere. Its an unlucky number for some, its a turn on for others. I seem to come accross is almost every where.

Is it some kind of a freak of a number, does it do anything for you??? or is it just part of ma madness???

It means absolutely nothing to me except that it is one number larger than 12 and one smaller than 14.

To attribute any other significance to it is really just silly. I've known a few people who thought it was "special" and they all believed in other silly stuff too. Just plain childish in their superstitions.

http://en.wikipedia.org/wiki/13_%28number%29

Thanx this explains everything.

By the way do you know what happens to the sound of an object when the object reaches the speed of sound, i know you get a sonic boom but what then???

The only thing I am suspicious about is the number 13. Then I moved into apartment 13 in residence... freaky.

Thanx this explains everything.

By the way do you know what happens to the sound of an object when the object reaches the speed of sound, i know you get a sonic boom but what then???You get the sonic boom because the object is moving at exactly the same speed as the sound waves it generates. That means that the sound waves are piling up on each other, creating one giant sound wave. The sound it is generating right now arrives at the same instant as the sound it generated one second ago and the sound it generated two seconds ago and the sound it generated three seconds ago...

What you hear as it passes by is one short but really loud sound. All the sound waves have summed into one giant wave, but it's traveling WITH the object so as soon as it's gone, so are they. That's the "boom."

If it's traveling faster than sound, then it's outrunning its own sound waves and leaving them behind. The object arrives before its sound does. They'll catch up soon enough (if it's not traveling too terribly fast) so the sound you hear will be loud, but it won't be one instantaneous "boom" that's gone as soon as it arrives. The sound will linger for a few moments.

You only get the "boom" effect when the object is traveling at exactly the same speed as sound waves.

Aircraft deliberately avoid cruising at Mach 1, the speed of sound, because that massive sound wave is not very good for the ears of the citizens below, or for the aerodynamics either. They accelerate up to the speed of sound and keep accelerating. So you hear the "sonic boom" that was produced during the few instants before and after it was going exactly that speed, when its sound waves more or less combined into one wavefront. You hear that boom whenever it reaches you, which depends on how far away the plane was when it was flying at the speed of sound. By definition this phenomenon only happens if the plane has already reached and exceeded the speed of sound, meaning the plane is already flying ahead of its own sound waves, meaning that you will always hear the sound AFTER the aircraft has passed you.

You get the sonic boom because the object is moving at exactly the same speed as the sound waves it generates. That means that the sound waves are piling up on each other, creating one giant sound wave. The sound it is generating right now arrives at the same instant as the sound it generated one second ago and the sound it generated two seconds ago and the sound it generated three seconds ago...

What you hear as it passes by is one short but really loud sound. All the sound waves have summed into one giant wave, but it's traveling WITH the object so as soon as it's gone, so are they. That's the "boom."

If it's traveling faster than sound, then it's outrunning its own sound waves and leaving them behind. The object arrives before its sound does. They'll catch up soon enough (if it's not traveling too terribly fast) so the sound you hear will be loud, but it won't be one instantaneous "boom" that's gone as soon as it arrives. The sound will linger for a few moments.

You only get the "boom" effect when the object is traveling at exactly the same speed as sound waves.

Aircraft deliberately avoid cruising at Mach 1, the speed of sound, because that massive sound wave is not very good for the ears of the citizens below, or for the aerodynamics either. They accelerate up to the speed of sound and keep accelerating. So you hear the "sonic boom" that was produced during the few instants before and after it was going exactly that speed, when its sound waves more or less combined into one wavefront. You hear that boom whenever it reaches you, which depends on how far away the plane was when it was flying at the speed of sound. By definition this phenomenon only happens if the plane has already reached and exceeded the speed of sound, meaning the plane is already flying ahead of its own sound waves, meaning that you will always hear the sound AFTER the aircraft has passed you.

Whould this explination apply to light, ie when a object moves faster than light instead of a sonic boom you get a sonic flash, i know this is just theory but whats the commonly accepted theory of light????

With reference to Friday 13th and the associated superstition...

The British Medical Journal (1993), found in an analysis of Road Traffic Accidents conducted over several years based on data collected on Friday 13s and Friday 6ths, that the risk of hospitalization as a result of an RTA was increased by as much as 53 percent on a 13th compared to a 6th.

Better stay at home!

ref.
http://urbanlegends.about.com/cs/historical/a/friday_the_13th.htm

Whould this explination apply to light, ie when a object moves faster than light instead of a sonic boom you get a sonic flash, i know this is just theory but whats the commonly accepted theory of light????
My guess is that, since when you hit the speed of sound, you get a loud sound wave from all of the sound waves before it piling up, you get a very, very bright flash of light from all of the light waves piling into each other.
Either that, or nothing.

The number 13 seems to be a special number, why is it that way, it apears almost everywhere. Its an unlucky number for some, its a turn on for others. I seem to come accross is almost every where.

Is it some kind of a freak of a number, does it do anything for you??? or is it just part of ma madness???
the number 13 is belonging to Goddess religion and is connected with Lunar phases,,,,the patriarchy i its suppression of the Goddess have demonized number 13, hence many people believe it is an unlucky number.....so it is more 'pa madness'!

Posted By: Hapsburg
My guess is that, since when you hit the speed of sound, you get a loud sound wave from all of the sound waves before it piling up, you get a very, very bright flash of light from all of the light waves piling into each other.

As stated before, the requirement for a sonic boom is an object reaching (or surpassing, I believe) the speed of sound. Since lightspeed is the speed limit, so to speak, of the universe, nothing can surpass the speed of light, hence no "light boom" can occur.

I believe the only thing that travels close to the speed of light is electricity.

Anyway, that's my 2 cents.

JD

I like dunedy's answer, but I think it's likely a lot simpler than (but related to) that.
There are 13 lunar cycles, therefore 13 full moons in a year.
I think it likely runs back to the myths and fears regarding full moons, which some people have blamed on predators being able to see prey (us many many years ago) on full moon nights.

Whould this explination apply to light, ie when a object moves faster than light instead of a sonic boom you get a sonic flash, i know this is just theory but whats the commonly accepted theory of light????
A sonic boom happens when you are travelling AT (not faster than) the speed of sound.
Since electromagnetic waves always travel at the speed of light, in one sense, visible light IS light's equivalent to the sonic boom.

As stated before, the requirement for a sonic boom is an object reaching (or surpassing, I believe) the speed of sound. Since lightspeed is the speed limit, so to speak, of the universe, nothing can surpass the speed of light, hence no "light boom" can occur.

I believe the only thing that travels close to the speed of light is electricity.

Anyway, that's my 2 cents.

JD

Ive got a theory that if an object hits the speed of light it would create a vacume instead of a build up as light does have properties of waves but also particles in cause i recon it would create a black hole the size extent i cant tell you as i have little understanding of black holes so far.

The number 13 seems to be a special number, why is it that way, it apears almost everywhere. Its an unlucky number for some, its a turn on for others. I seem to come accross is almost every where.

Is it some kind of a freak of a number, does it do anything for you??? or is it just part of ma madness???

Yeah, 13 is the special number until you get 13 years of age, then it'll be 16, then 18, 21 and so forth...

in most hotels there is no 13th floor

apollo 13 launched at 13:13 UT
it exploded on april 13th

As stated before, the requirement for a sonic boom is an object reaching (or surpassing, I believe) the speed of sound. Since lightspeed is the speed limit, so to speak, of the universe, nothing can surpass the speed of light, hence no "light boom" can occur.
Have you never heard of "FTL" in your life before?