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    From Richard Hachel@r.hachel@tiscali.fr to sci.physics.relativity on Thu Sep 24 13:21:24 2026
    From Newsgroup: sci.physics.relativity

    I define the "real speed" (Vr)rCoalso known as proper speed or
    celerityrCoof an object or particle within a reference frame as the ratio
    of the distance traveled in that frame to the object's proper time.
    This concept differs from the observable speed (Vo) conventionally
    measured within the frame.
    Conventionally, Vr = Vo/sqrt(1 - Vo-#/c-#),
    with the reciprocal relationship being Vo = Vr/sqrt(1 + Vr-#/c-#).

    Real speed is not limited in magnitude and can reach infinity,
    as is the case for a photon in a vacuum.

    It is this speed that determines the momentum (p = m-+Vr)
    and energy (E = mc-#-+sqrt(1 + Vr-#/c-#)) values rCirCimeasured by
    physicists.

    R.H.
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  • From nospam@nospam@de-ster.demon.nl (J. J. Lodder) to sci.physics.relativity on Sat Sep 26 22:13:41 2026
    From Newsgroup: sci.physics.relativity

    Richard Hachel <r.hachel@tiscali.fr> wrote:

    I define the "real speed" (Vr)rCoalso known as proper speed or
    celerityrCoof an object or particle within a reference frame as the ratio
    of the distance traveled in that frame to the object's proper time.
    This concept differs from the observable speed (Vo) conventionally
    measured within the frame.
    Conventionally, Vr = Vo/sqrt(1 - Vo?/c?),
    with the reciprocal relationship being Vo = Vr/sqrt(1 + Vr?/c?).

    What is the news? See:
    <https://en.wikipedia.org/wiki/Proper_velocity>
    for much more,

    Jan

    Real speed is not limited in magnitude and can reach infinity,
    as is the case for a photon in a vacuum.

    It is this speed that determines the momentum (p = m-+Vr)
    and energy (E = mc?-+sqrt(1 + Vr?/c?)) values ??measured by
    physicists.

    R.H.
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