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From: mike@amdcad.UUCP (Mike Parker)
Newsgroups: net.physics
Subject: Re: Re: Why FTL is illegal, in many small words.
Message-ID: <228@amdcad.UUCP>
Date: Fri, 9-Nov-84 22:36:59 EST
Article-I.D.: amdcad.228
Posted: Fri Nov  9 22:36:59 1984
Date-Received: Sat, 10-Nov-84 10:20:35 EST
References: <327@mhuxt.UUCP> <8130@watarts.UUCP> <333@mhuxt.UUCP> <713@sdcsla.UUCP>
Organization: AMDCAD, Sunnyvale, CA
Lines: 45

> 
> 
> So (without relativity), if you have two observers moving relative to
> each other, and they measure different speeds of light, which would be
> correct?   For example, if observer "A" (female) is moving toward Earth
> at 100,000 km/sec, and observer "B" (male) is on Earth, and they each
> (simultaneously) shoot a 1-second laser pulse at the other:
> 
> 	A-->         <--B		(approaching at 100,000 km/sec)
> 
> [Presumably they have synchronized their watches and agreed beforehand
> on when to fire their lasers, and they time the interval between when
> they fire and when they receive the other's light pulse.]
> 
> A would (in non-relativistic Universes) see the light from B moving
> at a speed greater than the speed of the light which she sent to B.
> 
> 	A: "My light pulse left at 300,000 km/sec, but I measure B's
> 	   pulse as approaching me at 400,000 km/sec."
> 	B: (ditto)
> 
> So A would expect her pulse to reach B after B's pulse reached her.
> And likewise, B would see A's light moving faster than B's own pulse.
> 
> 	A: "Since B's pulse left at the same time as mine, and his
> 	    pulse is traveling faster, he must have received my pulse
> 	    after I received his."
> 	B: (ditto, change gender of pronouns)
> 
> When they meet, each believes the other's light was travelling
> faster, and thus that the other one will have recorded a longer
> time-interval between firing and detection.
> 
> 
> 	-- Larry West, UC San Diego, Institute for Cognitive Science


Ah, Excuse me, but, you see, I'm new to the net and I don't
understand. All this talk about boys and girls ( men and
woman, if you insist ) and how fast their pulses are. I 
thought I was reading net.singles but this shooting at each
other with lasers sounds rather aggressive. Is there a group
for S&M??????

Mike at AMD