• cryptosporidium140@lemmy.world
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    1 year ago

    That is assuming both portals have speed. If the other portal was on the back of the train it would be like a hula hoop but if the other one is stationary you have the people going in really fast and coming out of the stationary portal at that speed.

    • Shiki@lemmy.world
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      1 year ago

      Why?

      Where does the energy even come from?

      A hole/portal doesn’t create or generate energy it just passes things through.

      Just think of it as a hole across space because that is exactly what a portal is.

      • cryptosporidium140@lemmy.world
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        1 year ago

        It’s already established in Portal that energy can be created by changing elevation with portals. If the other portal is on the back of the train, you’d just fall out because you’d be shooting backwards at a speed that cancels out the speed of the back portal. If that portal were just sitting stationary you’d have to fly out at the speed you went in. The puzzle comes from people trying to apply ordinary physics to something that deliberately breaks them.

        • Shiki@lemmy.world
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          1 year ago

          No energy is every transferred as a result of a portal

          You fly in the air if you drop in one because you are carrying momentum downwards that suddenly translates to upwards

          You are sat in the floor, a portal flies towards you. You are sat at the floor at the end, you had no momentum going in and no momentum going out

          • cryptosporidium140@lemmy.world
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            1 year ago

            Exactly how fast do you think the people exit that portal? Train speed, less than train speed? What slows them down after they exit? If you blocked the stationary portal would you get hit by the people? If so, what force would cause that?

            The people may be stationary relative to the area outside the first portal, but they already have velocity relative to the world outside the exit even before they go through

            If there were no people on the track and you blocked the stationary portal, would you feel wind on your face?

            • Shiki@lemmy.world
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              1 year ago

              Zero fast. There is no energy being transferred to the people, they would plop out and push into each other as they are forced through.

              If you blocked the stationary portal then the portal moving would essentially just be a wall, no one would go though.

              This whole relative thing makes no sense, energy isn’t just created because it’s observed by someone else, the door is moving not the people so them sitting there won’t suddenly be catapulted going through a moving portal, where is that energy created?

              Your wind question is confusing.