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tech / sci.math / Re: addition of velocities

SubjectAuthor
o Re: addition of velocitiesRobel Vitali

1
Re: addition of velocities

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https://www.novabbs.com/tech/article-flat.php?id=114359&group=sci.math#114359

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From: lla...@lrrleieo.ia (Robel Vitali)
Newsgroups: sci.math,sci.physics,sci.physics.relativity
Subject: Re: addition of velocities
Date: Fri, 30 Sep 2022 15:43:50 -0000 (UTC)
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 by: Robel Vitali - Fri, 30 Sep 2022 15:43 UTC

Stan Fultoni wrote:

> On Friday, September 30, 2022 at 7:12:58 AM UTC-7, Dono. wrote:
>> > The closing speed is v1 - v2, whereas the relative speed if
>> > (v1-v2)/(1-v1v2).
>> >
>> In a frame S , two objects having the respective speeds v1 and v2 have
>> the relative speed equal to v1-v2.
>
> No, that is their closing speed. Their relative speed is
> (v1-v2)/(1-v1v2). Of course, if either v1 or v2 happen to be zero,
> these have the same value (with suitable sign convention).

and also, for capacitors in series. Here more proofs for

* (r1·r2) / (r1+r2) *. I like it.

https://www.wikihow.com/Solve-Parallel-Circuits#/Image:492123-14-1.jpg

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