• Victor@lemmy.world
    link
    fedilink
    English
    arrow-up
    2
    arrow-down
    2
    ·
    20 days ago

    I don’t count having no visual indication of the object as “tracking” it, if we’re talking semantics. One frame could equal an even faster speed than what it would minimally take to cross the entire width of the image at some trajectory vector. For other vectors, it could be (much) less (like not passing straight through the image from on side to the opposite side, e.g.).

    It’s important to not hang too hard on this as the escape speed is dependent on air resistance, or rather lack thereof. Those escape speed numbers are defined along with the assumption of zero air resistance or other forces acting on the object.

    • finitebanjo@lemmy.world
      link
      fedilink
      English
      arrow-up
      2
      ·
      19 days ago

      You can use the frame from before to calculate the MINIMUM speed. It could have been going even faster.

        • finitebanjo@lemmy.world
          link
          fedilink
          English
          arrow-up
          2
          arrow-down
          1
          ·
          19 days ago

          No, not really. The object was placed directly above the payload beneath a 150M straight borehole. If there was some sort of angle to the hole them I’m sure the researchers would have accounted for it.

          • Victor@lemmy.world
            link
            fedilink
            English
            arrow-up
            1
            arrow-down
            2
            ·
            19 days ago

            Right. Then the angle is such that you could calculate it. But it still depends on the trajectory, so that’s not wrong, for whoever down voted…

              • Victor@lemmy.world
                link
                fedilink
                English
                arrow-up
                1
                arrow-down
                2
                ·
                19 days ago

                About what am I confused? How about you present an argument instead of just down voting? Please elaborate, thank you.

                • finitebanjo@lemmy.world
                  link
                  fedilink
                  English
                  arrow-up
                  2
                  arrow-down
                  1
                  ·
                  edit-2
                  19 days ago

                  Idk what you think trajectory means but they know the angle the steel cap shot off at and they know the angle and distance from which the high speed camera viewed it. There is no room for ambiguity, they calculated the minimum speed. There are no outside forces that could have curved the shot, either. An 900kg object going any number of kilometers per second won’t be effected by windspeed for example.

                  You’re just making an ass of yourself, speaking nonsense.

                  • Victor@lemmy.world
                    link
                    fedilink
                    English
                    arrow-up
                    1
                    arrow-down
                    2
                    ·
                    19 days ago

                    Trajectory means what it means. Look it up and we’ll have the same understanding of it.

                    You’re saying the trajectory is known, and I’m saying that in that case what you’ve been saying should be correct. Maybe if you fuckin relax and don’t attack someone just because you don’t understand what they’re saying you’d not come off as such an asshole. Jesus Christ, Mr. Hothead.

                    An 900kg object going any number of kilometers per second won’t be effected by windspeed for example.

                    Uh. Excuse me? How much do you think an aeroplane might weigh? 😆 Probably more than 900 kg. And the wind speed is probably not the issue. It would be the drag. 👌

                    So anyway. Let’s relax in the next comment, shall we? Let’s have a nice discussion from now on, no attacking. That would be cool, and adult.