• 0 Posts
  • 26 Comments
Joined 1 year ago
cake
Cake day: June 22nd, 2023

help-circle
  • I think people kind of ruined entropy with all that disorder crap. The simple conceptual explanation is that entropy represents the energy that is unavailable to do work. The more entropy a system has the less work it’s capable of doing, which ultimately means the less can happen within that system. Entropy always increases globally, because anything you do is something that happens and anything that happens means less energy available to make other things happen. The complex esoteric interpretations might have some conceptual value in specific circumstances, but like a lot of science communication the rigorous scientific definitions don’t get communicated, so now we have nebulous concepts like order and disorder floating around that just confuse people more than anything.


  • As an engineer this is a comically incorrect take. Absolute zero is useful as an absolute reference in the same way zero of anything is. Try doing anything more complex than high school physics and the practical necessity for an absolute temperature reference becomes obvious. For fucks sake they even bothered to make an imperial version. Rankine is just Fahrenheit shifted to have zero be absolute.


  • I understand why people always say things like this. It’s the not having a choice that ruins eternity. Fortunately it seems that such a fate is physically impossible in this reality. Even if you were made of the most durable possible material, you would still fundamentally be composed of baryonic matter, which means if you fell into a star, collided with a celestial object at relativistic speed, or fell into a black hole, you would surely die. There is always a way out for an enterprising immortal, and afterwards sweet nothing.


  • This is kind of a shit metaphor because if we extend it to how piracy actually works it highlights how stupid DRM is in the first place. A lock on your house has to be picked by each individual robber, unless they all show up on the same day. A cracked game would be like if only one person has to pick the lock on your house, but they don’t actually take anything they just make a perfect copy of your house without the draconian 12 step lock you installed and gives copies to whoever wants one. If you never noticed all the people sharing magical copies of your house with each other you would never know you lost anything, because you didn’t. Only your blind greed was injured by the thought that those people might have been willing to pay to use your house if only it had been locked down against those damn house copiers. On your next house you make the locks even more invasive and complex, to the point they block half the driveway or make the oven and bathroom unusable. Then that same one person spends an extra half day to pick it and makes a copy but without the crazy lock so they actually get a better house than you’re selling. Whether people like it or not, digital media has always been on the honor system, and always will be. DRM just punishes people for doing the honorable thing and paying.





  • I’d just like to say this is categorically false advertising if there isn’t an actual hat inside. If they included extra foil for the hat the amount listed on the box would be incorrect. If they didn’t include extra foil, or the label said the correct amount of foil, then there’s no free hat. Those are completely mutually exclusive cases, so if there’s no hat, easy false advertising lawsuit. You deserve the free hat they said you were getting.



  • Wow I’ve never thought of it that way. That makes so much sense. This kind of implies all subscription based services will inevitably devolve into paying more for less in a race to the bottom until the whole thing collapses. Which is interesting because I remember hearing about an economics paper that showed that the most profitable business model is bundled subscriptions. It’s kind of amazing someone can say that with a straight face looking at what has happened to cable TV.





  • No momentum at all relative to what? Relativity tells us that there is no fixed frame of reference. In practice what that means is there is no universal zero velocity. You only have velocity relative to other things. The implicit assumption in your argument is that you would have no momentum relative to the earth, which in itself is problematic. After all, the earth spins at a rate of 360 degrees per day, so not moving relative to the earth would mean moving 463.83 m/s relative to the surface of the earth at the equator, which is supersonic. But maybe you mean relative to the surface of the earth. What if you go to the moon? Or mars? Or into orbit? Maybe you mean relative to the nearest big thing. If you could somehow teleport from the ground into a plane, would the plane count as the nearest big thing? What about a bus? That’s on the ground, so maybe the nearest big thing would be the ground, if the mass of the thing matters in how the nearest big thing is determined. You can see how this can quickly turn into a mess of rules and special cases.


  • We can make some estimates for what would happen. The specific enthalpy (basically energy per kilogram) of air, modeled as a diatomic ideal gas, would be 7/2RsT, where Rs is the specific gas constant of air and T is the temperature. The specific gas constant of air is 287.05 J/(kg K), so at 293.15 Kelvin (20 C, ~70 F) the air would have 294kJ per kilogram. An average human displaces about 0.06522 cubic meters (65.22 Liters, 17.2 gallons), and air at standard conditions has a density of 1.20 kg/m^3, meaning you displace about 0.078 kg. This means an average person teleporting would create an energy difference of about 23kJ between the vacuum they leave behind and the surrounding air. That’s as much energy as a 1kg mass moving at 214 m/s (478 mph, 770 kph) or about Mach 0.62 at sea level, or a 1000 kg mass moving at 6.78 m/s (15 mph, 24.4 kph). So imagine getting crushed against a wall by Grandma driving a small sedan at a human running speed, except the wall doesn’t take any of it. That is also a bit more energy than a .50 BMG bullet, which apparently is used to shoot down helicopters.

    If you teleport really close to your starting position, we can assume the total energy would be doubled. Also consider that this analysis is conservative. The faster the teleportation happens the more energy you’re going to release. This only accounted for the energy of the air itself, not the kinetic energy of all the air that would rush in to fill the vacuum, or the energy you add to the air when you pop back in, which could be significantly more if you pop back in really fast. So it could be quite a bit of energy. I always imagined that a superhero or villain that could teleport would need some kind of force field just to survive the process, and that they could develop their ability to teleport faster to use it as a weapon, or teleport slower for stealth and not destroying their destination. Looking back at Jumper the amount of damage they do when they teleport is pretty minor, considering the math. The energy released would only grow if you could take stuff with you.



  • applebusch@lemmy.worldtoLemmy Shitpost@lemmy.worldChoose wisely!
    link
    fedilink
    arrow-up
    29
    arrow-down
    5
    ·
    1 year ago

    I agree with your choices but your logic for the teleportation doesn’t hold up. You’ve assumed your momentum wouldn’t be conserved through the teleportation in a weird way. Assuming momentum is conserved, you would still fall just as quickly. In fact, you would reach terminal velocity in short order, and would have to continually teleport to keep yourself from crashing into the ground. By itself that would be bad enough, but you moving through the air between teleports would cause the air to move as well, so assuming you could keep up and hold your elevation, your velocity relative to the ground would increase to some number higher than terminal velocity. Think Chell continually falling through portals. Now you’re stuck unless you can also teleport slightly to the side without falling. Best case you go to one of those indoor skydiving places and get in so you can slow down without dying. I was going to explore what would happen if your momentum somehow wasn’t conserved, but that would imply some absolute fixed frame of reference or magical mumbo jumbo, neither of which exist.

    You could totally travel faster though, without even needing to walk. You would also be super dangerous in one on one combat sports. A well placed 7 inch teleportation can easily get the win in the right sports.


  • In my experience this most often comes from a failure to perform routine maintenance, and Windows being a bloated rotting whale, decaying on the beach, slowly expanding and spreading its horrid filth across the entire system. Give your computer a new life by cleaning out all the dust, reapplying thermal paste to the CPU, oiling fan bearings, and installing a lightweight Linux distro, or at least a fresh whale carcass (clean windows install).


  • For some history, the original DOTA was a custom map in Warcraft 3. It pretty much defined the moba genre. From there lots of clones were created, and eventually some were made into full games. League of Legends is one of those, and became the most popular. So yes, they’re all just Warcraft 3 with only the hero parts.