• 0 Posts
  • 25 Comments
Joined 2 years ago
cake
Cake day: June 8th, 2023

help-circle

  • Close, but now you come into contact with the atmosphere not actually being the same density (in weight/volume as well as in particles/volume) throughout, but instead gets thinner as you get away from the earth.

    For simplicity, assume space is actually empty, and the atmosphere gets thinner linearly up until x kilometers above sea level it’s completely empty. Then the density will also decrease with height, and the helium balloon will eventually find a spot that matches its density, and stop there.

    Again there’s so much more to it but as a simplified model this works 😅

    Rockets mostly need to fight speed (of the earth revolving around the sun), and indeed in our atmosphere speed means friction, but in space rockets still need a lot of propellant to change their trajectory. As always there’s a relevant xkcd: https://what-if.xkcd.com/58/


  • The very short answer is that gas pressure is mostly proportional to the amount of particles per volume.

    So a balloon filled with helium has X particles per cubic cm, while the air around it has the same amount (instead of getting crushed). But because helium is a lot lighter per particle than standard air, this makes the balloon lighter than air, and like trying to push an air-filled balloon underwater, this helium-filled balloon floats to the higher layers of air, until other smaller forces also start to matter and the balance is restored.

    So a “vacuum-filled” balloon has nothing to give counter-pressure, but a balloon filled with helium definitely does.



  • I like the theory where (one of) the “great filter(s)” is just the likelihood of a technologically advanced civilization emerging from a greedy society is just way more likely than from a complacent society. So at some point some creature somewhere gets some critical mass of tech fueled by greed, this leads to global domination (humans over animals, as well as europeans over their colonies).

    Without the greed, there would not have been the technological advantage, but due to this same greed we now have weapons of mass destruction strong enough to wipe any semblance of intelligent life from the planet.

    Of course this theory is very black and white (not to mention capitalistic). Perhaps a curious society is also an option to reach technological advantage but not global domination, but would such a society manage to become a Kardashev type I civilization by sharing rather than conquest?

    So to directly answer your question: I think it’s likely that someone would have enslaved most of the earth somehow, (which absolutely does not excuse it). It’s surprisingly good that humans on average dislike the idea of slavery and colonisation now, so maybe we can build on top of that a society of curiosity and progress instead of one of war and a (literal) dead end.







  • Who’s going to say what is to be reset in a “full new install” and what is kept? I don’t think the line is as clear as you think.

    For example, the disk space. Maybe one partition was made to be a flat amount, and another gets what’s left, maybe it’s a percentage split. Who’s to say?

    What if the rest of the hardware is significantly different? Maybe your old amd setup needed no third party drivers, but your new nvidia setup is broken without the third party drivers?

    I don’t think copying the username / password is a good idea either, ever, by the way.

    I think the gray area between cloning and just doing a fresh install without copying anything is a little too personal (and/or hardware-specific) to really manage well this way.







  • Not OP but interested in both privacy and high-tech features. My current (stock) pixel 4a device has a worse camera than many other phones, but the software compensates a lot, netting better picture quality overall very often. I’m wondering how much of that is lost when using graphene instead of stock android, do you know?

    Similarly with the latest gen pixels having AI features built in, I’m assuming much of that is software that’s not as easily installed somewhere else…