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Cake day: March 23rd, 2026

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  • ttayh@lemmy.ziptoScience Memes@mander.xyzThe speed of light
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    4 days ago

    They have momentum, but not mass (ignore the other explanation, like yes, E=sqrt(m0^2 c^4 + (pc)^2), but so what? m0=0 for photons)

    As you can see, momentum, p, is p=E/c, and we know that the energy for light is proportional to its frequency, f, E=hf (h is Plank’s constant). So, p=hf/c. When light is absorbed by a material momentum (and energy) conservation apply and it imparts p onto the object. If light is reflected it imparts 2*p, showing this is left as an exercize to the reader





  • Having lived in the US for 8 years now, simply existing here causes more waste. E.g., packaging: many more layers and plastic; car centrism is another cause.

    Also hearing how much food stuff (like left overs) my coworkers, friends, etc, throw out is insane.

    Yet another example came to mind. I went to a baby shower a few yrs ago, as part of the decorations the parent had some really cute animal cutouts with a plywood back (good plywood). They where gonna throw those out, I rescued them and now they decorate my kid’s wall

    Cops, truck drivers, delivery drivers, avg Joes just idling their cars because reasons

    None of these are big corpos, this is just yankee culture