Good point though I still suspect you'd get up a fair lick of speed before it was shut down.What kind of crappy AI isn't watching everyone on the ship? LOL
Good point though I still suspect you'd get up a fair lick of speed before it was shut down.What kind of crappy AI isn't watching everyone on the ship? LOL
Aren't you assuming that "artigrav" works like gravity? Artigrav could be so different than gravity that when you remove it your body goes back to the momentum it would have had before entering artigrav.Following on from that (falling and landing suddenly!) in a book rather than film, I recently read a real clanger:
You'd stop accelerating but you wouldn't stop moving and you'd almost certainly be moving fast enough by then for death or at least injury. Reversing the artificial gravity for exactly the right amount of time would work but would also have catastrophic rather than just inconvenient consequences for everyone else.
Frankly if an author/scriptwriter/director can't wrap their mind around basic physics they should avoid Science Fiction.
That wouldn't be consistent with how it behaves in the rest of the book. And you could say that about anything in this thread and indeed anything in science fiction, which is where the grey areas come between hard SF, SF and what I'd describe as Science Fantasy.Aren't you assuming that "artigrav" works like gravity? Artigrav could be so different than gravity that when you remove it your body goes back to the momentum it would have had before entering artigrav.
Author's physics, author's rules.
For me a curious thing about the movie, Gravity is the lack of discussion of when Sandra Bullock's character was supposed to release herself from the Canadarm.
It was broken loose from the shuttle and spinning and Cloony's character was yelling at her to release from the arm like it made no difference when she did it. Since it was rotating and moving in a line away from the shuttle what direction she would be hurled in would depend on the timing.
But for all of the talk about how accurate or inaccurate the movie was Neil DeGrasse Tyson has not discussed that. Yeah, just sling her faster away from the shuttle!![]()
If you're talking about this scene, I would note that Canadarm is rotating around Bullock, not the other way around,
The Canadarm is 15.2 m (50 ft) long and 38 cm (15 in) diameter with six degrees of freedom. It weighs 410 kg (900 lb) by itself, and 450 kg (990 lb) as part of the total system.
The Apollo suit, including the life support backpack, weighed about 180 pounds. The Shuttle suit, including the life support system, weighs about 310 pounds. The suit itself weighs about 110 pounds. If an astronaut weighing 175 pounds wears the complete suit, the total weight is then about 485 pounds (310 + 175 =495).
You're assuming that the mass is evenly distributed across the length of the arm. More likely the two ends are the heaviest parts, and the shuttle end was broken off. So if the majority of the arm's mass is left at the claw end, it is going to keep the CG near the astronaut.It has been a long time since I saw the movie but if they shot it that way then it is just another error.
Canadarm - Wikipedia
In reality they would have rotated around their mutual center of gravity which would have had to be a few feet away from her.
You're assuming that the mass is evenly distributed across the length of the arm. More likely the two ends are the heaviest parts, and the shuttle end was broken off. So if the majority of the arm's mass is left at the claw end, it is going to keep the CG near the astronaut.
None of which changes the fact that the character had little chance of properly gauging and executing a useful release point. Have you ever been in an aircraft in a spin?There were 3 mass concentrations; the shoulder, the elbow and the wrist. In the film the upper arm broke leaving the shoulder with the shuttle. The elbow and wrist were rotating with Sandra. Each arm section was about 60 pounds and 25 feet long so the elbow was probably about 1/3rd of 750 pounds. That much weight at that distance would put the center of rotation some feet away from Bolluck. So releasing would alter her trajectory.
The conversation during that scene implied that the arm was carrying her away but they had mutual complex movement. When she released would matter and possibly make it worse at the wrong time. Even if I was making the invalid assumption you accuse me of it would still be true. The wrist was about 5 feet long by itself. You can even see that in the film.
BTW, Where can I read about these engineering numbers you've supplied?Each arm section was about 60 pounds and 25 feet long so the elbow was probably about 1/3rd of 750 pounds.
BTW, Where can I read about these engineering numbers you've supplied?
Thank you.
What is it you think is wrong with this scene? If Clooney can't see her and she is spinning in two axes, what should he be telling her to do?
For me a curious thing about the movie, Gravity is the lack of discussion of when Sandra Bullock's character was supposed to release herself from the Canadarm.
I'm sure there would be some discussion if all the astronauts, engineers or physicists that saw it noticed something wrong with that scene. Given what is shown to be happening, I think the characters reacted realistically.What I said was:
They could have had her in sight of Clooney telling her to calm down and tell her when to release. Releasing at random could make matters worse But it is the lack of discussion of the rotation that I have found peculiar about this "accurate" movie.
Lack Thereof - I still enjoy hearing made up science in old movies and early television shows.
Bad Science - People experimenting on themselves, or see someone do something stupid on Youtube, because they don't use common sense.
Hand of Death (1962)
Good Science - Anything that can benefit humans on Earth and/or improve our world.
I'm sure there would be some discussion if all the astronauts, engineers or physicists that saw it noticed something wrong with that scene. Given what is shown to be happening, I think the characters reacted realistically.
You're assuming that the mass is evenly distributed across the length of the arm. More likely the two ends are the heaviest parts, and the shuttle end was broken off. So if the majority of the arm's mass is left at the claw end, it is going to keep the CG near the astronaut.
Aren't all objects in Space regardless of size Weightless ?
Mass and weight are different.Aren't all objects in Space regardless of size Weightless ?