Mastodon @davidga@mastodon.xyz

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Joined 1 year ago
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Cake day: June 12th, 2023

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  • Lemmy is a federation of servers. “Lemmy” is not one political group with one viewpoint. If you’re looking for different viewpoints, try different groups, or different servers.

    In another comment you said this about the comments you read:

    they’re made in bad faith

    I don’t think this is true. I think that what you think is “bad faith” is actually “people who disagree with me”. So far, most users of Lemmy appear to trend politically left by American standards, but that’s only because American standards are so absurdly skewed to the right that it appears to stand out. By American standards, “truth” is left-wing.

    Ask yourself what you’re actually looking for.



  • DavidGA@lemmy.worldtoTechnology@lemmy.worldUnsmart a smart TV
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    6 months ago

    So, “yes”, but also no. You’ll lose the calibration panel for your display, and the result will probably be unwatchable.

    You’re much better off buying a display which is un-smart to start with. These are often called “commercial displays”. Or of course you could just buy a monitor.











  • If you take a small fluid element inside a fluid, the pressures on its sides are trying to compress it from all directions. But that doesn’t make pressure itself a vector. The force due to the pressure on each face of the fluid element is a vector, but the pressure causing that force is just a magnitude.

    If pressure were a vector, it would need a specific direction in three-dimensional space. The very fact that pressure acts equally in all directions at a point in a fluid reinforces its scalar nature.

    If you’re thinking about the force exerted on the walls of a container due to the pressure of the gas inside, then you’re dealing with vectors. The force on a specific part of the wall has a magnitude (due to the pressure) and a direction (perpendicular to that part of the wall). But the pressure itself, which causes that force, remains scalar.

    While pressure results in forces that have clear directions, the pressure itself does not have a specific direction. It is simply a measure of how much force is exerted per unit area, without specifying which direction that force is applied.


  • You’re right that electrons, which carry electric current, have mass and are influenced by gravity. However, the gravitational force on an electron is minuscule compared to the electromagnetic forces driving the electrons through a circuit or a conductor.

    To give you some perspective:

    1. Gravitational Force: The force due to gravity on an electron is given by ( F_g = m \times g ) where ( m ) is the mass of an electron (~9.11 × 10^-31 kg) and ( g ) is the acceleration due to gravity (~9.81 m/s^2). The resulting force is extremely small.

    2. Electromagnetic Force: When an electric potential (voltage) is applied across a conductor, it exerts an electromagnetic force on the electrons. This force is many orders of magnitude larger than the gravitational force on the electrons.

    Due to the vast difference in magnitude between these forces, the gravitational force on electrons in a circuit is effectively negligible. Electrons “move” because of the electric field (from the applied voltage) pushing/pulling them, not because of gravity.

    That said, in the absence of any other forces, electrons would indeed fall due to gravity, just as anything else would. However, in the context of electrical circuits and currents, gravity’s influence on individual electrons is overshadowed by the much stronger electromagnetic forces.