| |
Main
Date: 14 Nov 2006 07:47:59
From: esmartguy
Subject: This is a time question; I'll bet (Einstein) didn't know about laser pointers
|
If he did, he would have thought about a laser bullet which is turned
on, the moment it is shot out a gun. Would that laser pointer bullet
move faster then light speed? Try thinking about that! How fast does a
bullet move plus with the speed of light added to it?
|
|
| |
Date: 14 Nov 2006 15:53:06
From: Sam Wormley
Subject: Re: This is a time question; I'll bet (Einstein) didn't know about
|
esmartguy wrote:
> If he did, he would have thought about a laser bullet which is turned
> on, the moment it is shot out a gun. Would that laser pointer bullet
> move faster then light speed? Try thinking about that! How fast does a
> bullet move plus with the speed of light added to it?
>
How Do You Add Velocities in Special Relativity?
http://edu-observatory.org/physics-faq/Relativity/SR/velocity.html
For any observer the velocity of any mass (bullet) is always less
than the speed of light, c.
|
| | |
Date: 14 Nov 2006 10:59:33
From: Starlord
Subject: Re: This is a time question; I'll bet (Einstein) didn't know about laser pointers
|
Simple, the bullet would NOT go faster than light.
--
The Lone Sidewalk Astronomer of Rosamond
Telescope Buyers FAQ
http://home.inreach.com/starlord
Sidewalk Astronomy
www.sidewalkastronomy.info
The Church of Eternity
http://home.inreach.com/starlord/church/Eternity.html
"Sam Wormley" <swormley1@mchsi.com > wrote in message
news:BDl6h.1062471$084.1009825@attbi_s22...
> esmartguy wrote:
>> If he did, he would have thought about a laser bullet which is turned
>> on, the moment it is shot out a gun. Would that laser pointer bullet
>> move faster then light speed? Try thinking about that! How fast does a
>> bullet move plus with the speed of light added to it?
>>
|
| |
Date: 14 Nov 2006 10:51:28
From: Brian Tung
Subject: Re: This is a time question; I'll bet (Einstein) didn't know about laser pointers
|
esmartguy wrote:
> If he did, he would have thought about a laser bullet which is turned
> on, the moment it is shot out a gun. Would that laser pointer bullet
> move faster then light speed? Try thinking about that! How fast does a
> bullet move plus with the speed of light added to it?
In a vacuum, light always moves at c (about 300,000 km/s), no matter
what the light source is attached to, or who's doing the measuring. So
even if Einstein knew about laser pointers, it wouldn't have mattered.
In air, light moves slower than c. How much slower depends on the air
pressure, temperature, etc., as well as who's doing the measuring, but
the variations are tiny.
--
Brian Tung <brian@isi.edu >
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.html
|
| |
Date: 16 Nov 2006 06:29:50
From: Mike Ruskai
Subject: Re: This is a time question; I'll bet (Einstein) didn't know about laser pointers
|
On or about 14 Nov 2006 07:47:59 -0800 did "esmartguy"
<tjtocco@netzero.net > dribble thusly:
>If he did, he would have thought about a laser bullet which is turned
>on, the moment it is shot out a gun. Would that laser pointer bullet
>move faster then light speed? Try thinking about that! How fast does a
>bullet move plus with the speed of light added to it?
You're thinking of it the wrong way.
The photons don't have the velocity of the bullet added.
Think of it as the bullet dropping the photons on a very sticky,
fixed-speed conveyor belt.
--
- Mike
Ignore the Python in me to send e-mail.
|
|
