cosecantphi [he/him]

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Joined 4 years ago
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Cake day: July 27th, 2020

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  • cosecantphi [he/him]@hexbear.nettoScience Memes@mander.xyzLaunches
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    2 days ago

    The reason you need to slow down is because you’re starting on Earth, which means you’re moving fast enough parallel to the sun’s surface that for every foot you fall downwards toward the sun, the sun’s surface curves away by 1 foot. This results in the nearly circular orbit around the sun we exist in.

    If you start speeding up, the orbit becomes more elliptical, except your aphelion starts raising away from the sun because now you’re moving fast enough that you’ve moved more than 1 foot sideways in the time you’ve fallen 1 foot downwards.

    Slowing down has the opposite effect. If you get your speed down to 0, you’ll fall straight down toward the sun as normal with gravity. But you don’t need to go all the way down to 0 velocity to enter the sun, you just need to slow down until your elliptical orbit brushes up against the sun’s surface. If you then want to speed back up to avoid falling into the sun, you need to do it parallel to the sun’s surface. At this point, speeding up toward the sun will actually make you fall into the sun faster.

    So basically the problem isn’t that you’re moving too fast to fall into the sun. By virtue of Earth’s orbit, you’re moving too fast in a direction away from hitting the sun’s surface.



  • Ukraine hasn’t even been independent for my entire life, what are you talking about? Do you think thirty years is a long time? Are you twelve?

    This is the thing that gets me with lemmy libs at times. I want to dunk on them harder, but some of them are so naive and ignorant about basic facts of recent history that in the back of my mind I can’t help but think I’m probably talking to an actual, literal child. Then I just feel saddened about it more than anything.




  • At what point did this become Russia’s aggression? Certainly after the fall of the Soviet Union by western backed coup (before which Ukraine and Russia were literally the same country). Did Russia’s aggression start when NATO aggressively expanded into the former Eastern bloc after promising not to as a major condition of the USSR’s dissolution? How about when Russia subjected its own population to devastating austerity, resulting in untold death and destruction. all in a genuine effort to liberalize and assimilate into NATO themselves? Was that Russia being too aggressive? Or did Russia’s aggression not start until after the west continued to wage economic warfare anyway, demonstrating NATO never had any intention to let Russia coexist peacefully on the world stage regardless? How aggressive was it of Russia when the west helped to orchestrate the 2014 Maidan coup in Ukraine to install a rabidly anti-Russian fascist government on one of Russia’s largest land borders? I guess Russia was being too aggressive when Ukraine decided to ban the Russian language and shell Russian speaking civilians in Eastern Ukraine for literally years and years in violation of the Minsk agreements, resulting in massive pro-Russian separatist movements forming to fight off Banderite pogroms.

    I think I get it now, after exhausting literally all available diplomatic avenues to peace, aggressive Russia started this conflict out of nowhere by supporting the cause of the breakaway republics invading poor innocent Ukraine, wow can’t believe a country would go to war like this at the drop of a hat! Irrational aggressive Russia should just take their troops home and surrender all territory back to Ukraine, a country losing a war so badly it’s on the verge of collapse.




  • Understanding classical waves better is what helped me wrap my mind around the physical meaning of the uncertainty principle. It’s not a technical limitation, and it’s not just because you need to interact with something to measure it. It’s just a property of waves. Since small enough particles exhibit the properties of waves, it only makes sense that we can’t know their location and momentum at the same time with arbitrary precision.

    The velocity of a wave is a function of its frequency and wavelength. But imagine a highly localized wave, essentially just a peak. What’s its frequency? Well, we find that it doesn’t have one frequency! If you decompose the wave, you find its mathematically a superposition of multiple sine or cosine functions with different frequencies and therefore velocities. So the more localized the wave is, i.e the more you know its position, the less and less you know about its frequency and therefore velocity.

    This stuff blew my mind when it was first explained to me.