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Re: energy and mass

From Bill Sloman <bill.sloman@ieee.org>
Newsgroups sci.physics, sci.electronics.design
Subject Re: energy and mass
Date 2026-02-14 07:20 +1100
Organization A noiseless patient Spider
Message-ID <10mo13e$2jeh7$3@dont-email.me> (permalink)
References (4 earlier) <t69nokpdl0n1n2mn3ghohe4ss84j4jinbu@4ax.com> <rays-20260210224721_-_@ram.dialup.fu-berlin.de> <hignok9mgdv6m1g84662bekro4je9sjm0s@4ax.com> <10mnira$2f3h2$1@dont-email.me> <mass-20260213171914@ram.dialup.fu-berlin.de>

Cross-posted to 2 groups.

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On 14/02/2026 3:20 am, Stefan Ram wrote:
> Bill Sloman <bill.sloman@ieee.org> wrote or quoted:
>>                        Energy has mass
> 
>    Counterexample: The photon. It has energy, but no mass.

Depending on how you define mass. Newton had one definition.

Einstein had another. Light pressure does imply that a photon has momentum.

-- 
Bill Sloman, Sydney

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Thread

energy and mass (was: usenet weirdness) ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-10 21:58 +0000
  Re: energy and mass (was: usenet weirdness) john larkin <jl@glen--canyon.com> - 2026-02-10 15:07 -0800
    Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-10 23:47 +0000
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 02:41 +0100
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 02:43 +0100
  Re: energy and mass (was: usenet weirdness) john larkin <jl@glen--canyon.com> - 2026-02-10 15:49 -0800
    Re: energy and mass (was: usenet weirdness) Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-02-11 01:19 +0000
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-11 16:32 +0100
    Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-11 15:23 +0100
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-11 17:21 +0100
      Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-17 10:34 -0800
        post-maturity brain damages in Ross Finalyson. (Re: energy and mass Mild Shock <janburse@fastmail.fm> - 2026-02-24 13:43 +0100
          Give this man an IQ booster, his brain is defaulting (Was: post-maturity brain damages in Ross Finalyson.) Mild Shock <janburse@fastmail.fm> - 2026-02-24 21:18 +0100
      Re: energy and mass Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-02-18 12:30 -0800
    Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 14:55 +0100
      Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-12 14:58 +0100
    Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 03:17 +1100
      Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-13 16:20 +0000
        Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-14 07:20 +1100
          Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 03:31 +0100
        Re: energy and mass Jeroen Belleman <jeroen@nospam.please> - 2026-02-13 21:50 +0100
          Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-13 15:03 -0800
            Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-13 23:35 +0000
              Re: energy and mass Jeroen Belleman <jeroen@nospam.please> - 2026-02-14 10:47 +0100
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 15:21 +0100
                Re: energy and mass Bill Sloman <bill.sloman@ieee.org> - 2026-02-15 02:46 +1100
                Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-15 01:24 +0100
                Re: energy and mass Jeremiah Jones <jj@j.j> - 2026-02-17 20:03 -0800
                Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-14 07:58 -0800
                Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-14 07:54 -0800
                Re: energy and mass Jeroen Belleman <jeroen@nospam.please> - 2026-02-14 18:01 +0100
                Re: energy and mass Gerhard Hoffmann <dk4xp@arcor.de> - 2026-02-14 20:52 +0100
                Re: energy and mass ram@zedat.fu-berlin.de (Stefan Ram) - 2026-02-15 17:20 +0000
              Re: energy and mass x <x@x.net> - 2026-02-14 15:38 -0800
                Re: energy and mass john larkin <jl@glen--canyon.com> - 2026-02-27 19:48 -0800
          Re: energy and mass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2026-02-14 03:36 +0100
  Re: energy and mass Python <python@cccp.invalid> - 2026-02-20 14:27 +0000

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