• Re: Relativity question

    From Gerald Kelleher@21:1/5 to All on Sat Feb 25 00:48:18 2023
    It is remarkable how angry I was back then in 2005 despite having a valid approach to the Earth science of geology and the links between rotation and plate tectonics along with the 26-mile spherical deviation between equatorial and polar diameters. Like
    a singer who sometimes feels embarrassed for naive lyrics at the start of their career, I can forgive myself for the outrageous enthusiasm for opening up solar system and Earth sciences research from the suffocating rules of reasoning or 'scientific
    method' subculture.

    Twenty years before the idea of chatbots gained wider attention, I was called one. Things have changed because the internet has changed with more visual narratives available and it is easier than ever to research the behaviour of rotating celestial
    objects with viscous compositions and especially differential rotation across latitudes in terms of plate tectonics by drawing on planetary comparisons-

    https://phys.libretexts.org/Courses/HACC_Central_Pennsylvania's_Community_College/Astronomy_103%3A_Introduction_to_Planetary_Astronomy/11%3A_The_Jovian_Planets/11.01%3A_Jupiter's_Atmosphere

    In 2005, there was no consideration of a rotational mechanism-

    https://en.wikipedia.org/w/index.php?title=Plate_tectonics&oldid=27495815

    Within a few years, they created a miserable mess by introducing rotation without following the proper principles.

    So, I regret that time when I was angry, but nowadays it is different as I have learned to live, albeit uncomfortably, with those who are mean-spirited and dull when there is so much to explore.

    --- SoupGate-Win32 v1.05
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  • From Quadibloc@21:1/5 to Doink on Sun Feb 26 01:36:26 2023
    On Saturday, November 12, 2005 at 1:00:33 PM UTC-7, Doink wrote:
    OK, Energy = Mass X Speed of Light Sq.
    I understand the principle, that this translates to a BIG number and thus a lot of energy is contained in matter. Yes, matter is essentially frozen energy. Stipulated.
    By I'm thrown by the SPEED of light thing. If something has a mass of 10 grams and I multiply it by 386,000 mph it doesn't make sense. Is there a scientific conversion from speed to some other unit????? How do you
    multiply mass times speed? Or is it just representational? Can the explanation be simplified?

    E = mc^2 is indeed consistent from the point of view of the use of units.

    One unit of energy is the foot pound. That is the amount of energy you
    use to lift an object that weighs a pound by a foot.

    However, that is not a unit of energy if you consider the pound to be a
    unit of mass. The pound is being lifted against the force of gravity, which
    is implied - unless you instead use the pound as a unit of force.

    So in the metric system, the basic unit of energy, the Watt, is equal to
    one Newton - metre. The work required to move something one metre,
    against an opposing force of one Newton.

    And what other units can be used to express a Newton?

    A Newton is the force which, when acting on a mass of one kilogram
    (not a gram, as the SI is basically a slight modification of the MKS
    system of units, where the metre, the kilogram, and the second are
    fundamental; the other old metric system was CGS, where the
    centimetre, the gram, and the second were fundamental; in that system,
    the unit of force is the dyne, and 100,000 dynes make a Newton) will
    cause its motion to accelerate at the constant rate of one metre per
    second... per second. So after a second, its velocity increases by
    one metre per second.

    So one Newton is one kilogram times one metre divided by one second
    squared. Therefore, one Watt, which is a Newton-metre, is one kilogram
    times one metre squared divided by one second squared.

    Therefore, energy is measured in units that are equivalent to mass
    times velocity (one metre divided by one second) squared. E = mc^2,
    therfore, is dimensionally correct.

    John Savard

    --- SoupGate-Win32 v1.05
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