Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Python <python@invalid.org>
Newsgroups: sci.physics.relativity
Subject: Re: [SR] The traveler of Tau Ceti
Date: Thu, 28 Mar 2024 00:03:23 +0100
Organization: CCCP
Lines: 29
Message-ID: <uu28jr$34de7$1@dont-email.me>
References: <7zee2Lkf92pHHnzqt_kMV5fR8gM@jntp> <utcpug$2dn03$2@i2pn2.org>
 <R0ZFINOyb6vlx3NXlysw0PqxoDY@jntp> <utfcpp$2gvmn$4@i2pn2.org>
 <FnjYaU3DyRRnlu_MFOzXEPk7r4M@jntp> <uti3uf$2k9fj$1@i2pn2.org>
 <3DYovuRp36VYCEocP4V4UuRej68@jntp> <utvc5s$3577m$1@i2pn2.org>
 <GMfEa0lgPeByhEzp-9lqni_rdE8@jntp> <uu1357$37cqt$1@i2pn2.org>
 <uu1joc$2v7j7$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 27 Mar 2024 23:03:24 +0100 (CET)
Injection-Info: dont-email.me; posting-host="6302a89f58a2372942f2e18057faf5d8";
	logging-data="3290567"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18Rk3sjozIPCQJ+2t3w86xR"
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:myCmztC0/CGzLJOV6WCz/Zf5C6s=
Content-Language: en-US
In-Reply-To: <uu1joc$2v7j7$1@dont-email.me>
Bytes: 2411

Le 27/03/2024 à 18:07, Volney a écrit :
> On 3/27/2024 8:25 AM, Paul B. Andersen wrote:
>> Den 27.03.2024 07:23, skrev Richard Hachel:
>>> Le 26/03/2024 à 21:45, "Paul B. Andersen" a écrit :
>>>> Den 22.03.2024 09:49, skrev Richard Hachel:
>>>>> Le 21/03/2024 à 21:05, "Paul B. Andersen" a écrit :
> 
>> You are claiming that the protons are going around the ≈ 27 km ring
>> ≈ 78 million times per second.
>> The real value is ≈ 11.25 thousand times per second.
>>
>> Don't you think the physicists at CERN had noticed the difference? :-D
>>
>> But maybe you were joking.
>> In that case you had me!
>>
> It appears "Dr." Hachel stumbled across the physics concept of 
> "rapidity". Rapidity is related to speed but isn't a speed. It is 
> related to speed by r = arctanh(v/c) where v is the velocity. The 
> rapidity of light is infinity. AFAIK, rapidity is used sometimes to 
> simplify the math. For example, rapidities of two objects in one 
> dimensional motion can be just added but velocities need the Einstein 
> velocity addition formula.

It is not even that, it is worse, far worse.