• GraniteM@lemmy.world
      8·
      3 个月前

      The movie Primer has a very limited time machine that works at -2X. You turn the machine on at, for instance, 2PM, and walk away, coming back in, say, eight hours. You then go into the machine, and you stay in there for eight hours. When you come out of the machine, it is now 2PM, the time when you first turned the machine on. It is a one-way machine; you can only ever use it to go backwards, and you have to go forwards in time the old-fashioned way.

      It was made on a budget of $7000 and it’s one of the best sci-fi movies ever made.

        • jaybone@lemmy.zipEnglish
          32·
          3 个月前

          “Will it change the path of an asteroid?”

          “Well, probably not.”

          Chomp

          • 🍉 DrRedOctopus 🐙🍉@lemmy.world
            5·
            3 个月前

            maybe?

            After learning of new technology and a warning, they developed a space program.

            The present is no longer a primate civilizations fighting each other and destroying the planet, instead a saurian civilisation has spread through the galaxy.

            • Smaile@lemmy.ca
              1·
              3 个月前

              That’s not how the butterfly effect works. Also no shot these 2 dunderhead could make that work.

    • GreenKnight23@lemmy.world
      18·
      3 个月前

      there was an episode where they created a dynamo generator and batteries.

      1000004273

      that took them something like six months with many people helping.

      unfortunately dynamos(like above) and batteries work on DC current. that time machine works on AC.

      so you would need to do two things.

      1. create a mechanical DC>AC inverter that preferably is powered from the physical input of the dynamo
      2. create batteries in both series and parallel to ensure a 120v voltage is maintained at the required amperage.

      also consider that north American standards require electricity to run at 60hz. this means the AC signal flips the DC signal 60 times per second. creating a mechanical inverter would need to take into account the size of the circle for a complete rotation in 1 second as well as the speed at which the dynamo must spin in order to get 60 alterations per second. the rough formula would look something like: frequency = speed/(diameter*3.14). speed can be variable depending on the size of the copper wheel used as well.

      to sum everything up, for just the two people there, it’s probably going to take them too long and they’ll die from exposure or predators.

      get excited

    • 9point6@lemmy.world
      12·
      3 个月前

      Assuming Dr. Stone is some kind of MacGyver regen:

      Two obvious approaches to me that I’ll run through in high level: build a wind/watermill generators or potato/lemon batteries

      First thing you’ll need to figure out for both is how to make some wire. That’s going to require finding some metal ore and a hot furnace, and creating a few tools out of stone to work with it.

      The biggest difficulty with the former two is going to be finding some ferrous metal to turn into magnets. You can make a magnet without electricity by smashing the shit out of some iron as it’s aligned with the earth’s magnetic field, and it’ll become a weak magnet. From there with enough wire, you can build a generator. With the sails of the mill, you can build that out of wood and foliage.

      For potato or lemon batteries, you’re going to need a shitload, as they give you about a volt and a pretty tiny current, but theoretically you could figure something out that way with enough. I imagine some things may want to eat your batteries though

      • CannonFodder@lemmy.world
        6·
        3 个月前

        Your lemon batteries will be DC tho. I think step one would be to start carefully dismantling the Time Machine to see what it really needs and what parts might be unneeded and reusable in a generator.

      • Dejected Warp Core@lemmy.world
        4·
        3 个月前

        how to make some wire. […] finding some ferrous metal to turn into magnets.

        These two ingredients put our 120v dynamo really far up the tech tree from “make fire.” Our intrepid time travelers are going to spend years trying to not be velocaraptor food and foraging for a meal themselves, all while making stupendous amounts of charcoal and prospecting for ore.

        • 9point6@lemmy.world
          2·
          3 个月前

          Oh don’t get me wrong, our intrepid adventurers are going to have to spend a good chunk of time on this with no guarantee they live long enough.

          However assuming knowledge isn’t a gap (given they already built a time machine), iron ore is fairly abundant in many areas of the world, and it’s relatively straightforward to build a kiln that would reach the appropriate temperatures to smelt the iron into bloom (that can be hammered into workable iron)

          It’ll take many, many years, but assuming they can avoid ending up as food, it doesn’t seem impossible

    • atomicbocks@sh.itjust.worksEnglish
      3·
      3 个月前

      That’s going to depend entirely on how good you are at finding and smelting copper with only Stone Age technologies.

      • 🍉 DrRedOctopus 🐙🍉@lemmy.world
        4·
        3 个月前

        my favourite trope in media, The season long enemy becomes a close ally at the end. And the hero just accumulates friends as if they were Pokémon.

        MLP, Dr Stone, Dragon Ball.

        need more of that.

  • 🇰 🌀 🇱 🌀 🇳 🇦 🇸 🇰 🇦 🇵 🇮@lemmy.world
    63·
    3 个月前

    No problem. The same people arrive from even later in the future with enough built-in power for both machines and rescue themselves. Everyone returns to their own times. When they arrive back in the earlier time, now they know they have to build another machine with spare power to go rescue themselves.

  • betanumerus@lemmy.caEnglish
    40·
    3 个月前

    That’s exactly why the movie was called “Back the the Future”: they had to find a way to get … “back the the future”.

    • prole@lemmy.blahaj.zone
      2·
      3 个月前

      There’s a second time machine in BttF, if I recall correctly. It might be the same time machine, but in the past, I forget tbh

        • prole@lemmy.blahaj.zone
          1·
          3 个月前

          Well… In Back to the Future 2, Marty witnesses the scene from the first movie with the Libyans. He watches himself, in the Delorean, go back in time to escape them.

          At that moment in 1985, two Delorean time machines existed: the one that Marty used to return 1985, and the one that he’s watching in the mall parking lot.

          Technically, it’s the same time machine I think?

          Been years since I’ve watched so this is just from memory.

    • Atropos@lemmy.world
      9·
      3 个月前

      Pshaw, merely requires a minor positional adjustment, and of course the entire historical location of every planetary body in the galaxy.

      • thebestaquaman@lemmy.world
        8·
        3 个月前

        Psssht. That just follows simple mechanics. Two orbiting bodies can be accurately modelled by a high schooler, how hard can a couple more be?

  • LordKitsuna@lemmy.world
    20·
    3 个月前

    The fact that it seems to be using a standard two prong plug outlet means it’s incredibly power efficient just bring a jackery with you

    • Napster153@lemmy.world
      5·
      3 个月前

      More than 90 percent of the power was used to finish dailies in Raid: Shadow Legends 4 and Clash of Clans 10

  • Dyskolos@lemmy.zip
    15·
    3 个月前

    They can be glad they’re still on earth not somewhere in empty space. What a lucky coincidence.

  • InvalidName2@lemmy.zip
    10·
    3 个月前

    Reminds me of my ole lady friend Marsha Worthsby used to live up top the hills back in days when we had to share the road with stegosaurus when we walked to school uphill both ways in waist-high snow. One day we was cold and decided to go into town to see if we could warm up at Bickett’s hardware store because they was one of the first places to get power where I grew up. Marsha had the bright idea to buy a heater for a nickle and take it home. One problem, they had not run power up to the top of the hill in those days. She could not use it. Bickett’s let her return the thing but only gave her 4 pennies back on account it was open.

      • InvalidName2@lemmy.zip
        5·
        3 个月前

        If only I could meet a man handsome as Biden. Hard to find them still alive when you get to be my age, honey. Said I wouldn’t have no other man after my dear Raymond pass away back in '97, but sometimes in life you have to make exceptions.

    • brsrklf@jlai.lu
      5·
      3 个月前

      Just checked on wikipedia… Origin of the solanaceae family is thought to be around 80 million years ago.

      Stegosaurus went extinct around 145 million years ago.

      They’ll be waiting for their potatoes a long time .

  • PieMePlenty@lemmy.world
    8·
    3 个月前

    Damn, now they have to make an alternator to spec without any tools or even raw materials with the knowledge they have in their heads. Time to dig for copper I guess… whoops no shovels either…

  • SuperApples@lemmy.world
    4·
    3 个月前

    Just need to find Benjamin Franklin to charge your patented Super Battery, and wash your carriage to ensure precipitation!

      • matthurtme@lemmy.world
        1·
        3 个月前

        Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)

      • WhoIzDisIz@lemmy.today
        9·
        3 个月前

        “I… uh… Oh, yeah - of course I do!”

        Yanks handle, gets smacked in face, nose bleeds profusely…

      • matthurtme@lemmy.world
        1·
        3 个月前

        So the machine can still go through time with no electricity needed for the exit? Would the doors not be powered by electricity?

      • matthurtme@lemmy.world
        1·
        3 个月前

        Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)

      • matthurtme@lemmy.world
        1·
        3 个月前

        Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)

    • WhoIzDisIz@lemmy.today
      7·
      3 个月前

      It was powered at the source time, but since the building the machine was in didn’t exist in the destination time the plug simply fell to the ground.

      ETA: The door has a handle, so it’s obviously not automatic like some Star Trek door.

      • matthurtme@lemmy.world
        1·
        3 个月前

        Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)