• MagicPterodactyl@lemmy.ml
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      1 year ago

      Yeah definitely A. The momentum of the object going through the portal matters not the objective that has the portal on it.

      • SuperIce@lemmy.world
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        1 year ago

        But how would the objects get on the other side then? The receiving side isn’t moving, so the objects essentially need to be pushed through the portal at the speed at which the train is moving, resulting in B. The only way A could work would be both portals moving at the same relative speed.

        • MagicPterodactyl@lemmy.ml
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          1 year ago

          I see it like throwing a hoola hoop around something. The object will pass through without having its speed affected.

      • HuddaBudda@kbin.social
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        1 year ago

        As the people on the track are moving at an accelerated speed of 0 m/s, normally a train would apply the full force of the train moving to the meat bags human ethic problems on the tracks.

        As newton’s first law states F = m*a, or Force = Mass * acceleration

        F = x * 0 = 0 N of force

        thus, they could just plop out as if falling after having a chair removed.

      • Darkard@lemmy.world
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        1 year ago

        Here’s how I always phase it. Imagine you have a shovel and you are using that shovel to flick some dog shit into your neighbours garden.

        With no portal the shit hits the shovel and you flick it, transfering the speed of the shovel into the turds. You stop the shovel and the turds fly away.

        Now imagine the shovel has a big rusty hole in it. So it’s like a n shape. No portal yet. You go to flick the dog dumps but you just pass straight over them with the hole and the dumps go nowhere. The dumps have gained no momentum because nothing touched them and transferred that to them.

        Now put a portal on the end of the shovel. As you sweep it over the cack has anything touched them? Has any object transferred it’s momentum to the dog eggs? No, so the dumps just gently tumble out of the other side of the portal.

        • haggyg@feddit.uk
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          1 year ago

          But even in the image example, how would that work? The people have no momentum, they wouldn’t flop out, just fall back through, and then stay half in half not. According to you, air resistance wouldn’t even push them out because as soon as it goes through the portal the air is not moving relative to the people. I think your blatant lack of respect for relativity is unnerving and gets super confusing very quickly.

        • Maticzpl@programming.dev
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          1 year ago

          Imagine there being 2 portals on the shovel one on the front and one on the back Whatever passes through remains in the same place. THIS is the actual analoge for the rusty hole. Entering the first portal the shit gains the speed of the shovel but since the exit portal is also traveling with the same speed but facing the opposite direction, it effectively cancels out the previous speed gain. Imagine it like the first portal adding one unit of speed to it and the exit one adding minus one unit of speed because of the opposite direction.

          So now with one portal on the shovel and the other somewhere on a wall the shit gets accelerated and you will feel a force acting on the shovel that decelerates it’s swing.

          Velocity is relative and this is why it works. If velocity wasn’t relative then Einstein would be wrong and many of the effects we see in the real world could never happen.