🧵 Untitled Thread
Anonymous at Tue, 25 Jun 2024 00:28:18 UTC No. 16251939
So I like to think I know a thing or two about gravitational pull, not to brag or anything. One thing that just doesn't make sense is that large bodies of mass like the earth pull in smaller objects like the moon creating an orbit, yet something like humans and grains of sand, which have a much greater difference in mass compared to the earth and moon, do not create an orbit of sand. Theoretically if you walk onto a desert or sandy beach, the sand should start floating around you. Yet it does not. Why is that?
Anonymous at Tue, 25 Jun 2024 00:49:31 UTC No. 16251954
>>16251939
mass creates gravity. the lower the mass the lower the gravity. such that humans do not have sufficient mass to pull an object with the mass of a grain of sand into them.
The earth has sufficient mass to pull grains of sand into it. as well as other objects, such as the moon, which it has pulled into orbit*.
this may be a problem with your IQ.
Anonymous at Tue, 25 Jun 2024 00:49:31 UTC No. 16251955
Earth has stronger gravity. Total magnitude is more important when all bodies are nearby.
Yes, earth is nearby the sand, before you ask.
Anonymous at Tue, 25 Jun 2024 04:29:17 UTC No. 16252157
>>16251939
>Theoretically if you walk onto a desert or sandy beach, the sand should start floating around you. Yet it does not. Why is that?
Because, when you "walk" onto a sandy area, guess what you, and the sand, are all sitting on that has several orders of magnitude more mass than both you or the sand grains combined?
If you want to attract sand grains on earth, then however many times more massive the earth is than you, you want to get (roughly) that much closer to a grain of sand than it already is to the earth. Good luck.
Anonymous at Tue, 25 Jun 2024 05:46:54 UTC No. 16252226
>the sand should start floating around you
theoretical question: how do we distinguish between astounding stupidity and outright trolling? the manifestations seem to overlap; do we go the totalitarian route and consider every dubious case to be trolling?
Anonymous at Tue, 25 Jun 2024 06:11:12 UTC No. 16252239
>>16251939
If you were in deep space, far from any larger gravity fields, the grain of sand could orbit you. It would probably not be a terribly stable orbit though, since your body is a very non-uniform shape.
Anonymous at Tue, 25 Jun 2024 07:17:39 UTC No. 16252297
>>16251939
I liked this question, it was interesting.
It seems you already got good answers above though.
I might as well add that geophysicists do use microgravity to study the uneven distribution and shape of the Earth's geoid. For example, if you are standing close to a huge mountain, the "vertical" vector there won't point at the center of the Earth anymore, It'll be slightly deflected towards the mountain (pic related), but our eyes can't detect it, only incredibly sensitive and precise instrumentation can. But pretty crazy, eh?
https://en.wikipedia.org/wiki/Geoid
That's why I liked your question.
Cheers
Anonymous at Tue, 25 Jun 2024 15:04:05 UTC No. 16252795
>>16252297
Pretty based
Anonymous at Tue, 25 Jun 2024 21:19:31 UTC No. 16253578
Ok Anons saying it's relative and earth gravity is stronger. Let's remove earths effect then.
Why are astronauts tethered to iss? They're in free fall, no effect of earth's gravity so they should instead be revolving around the large mass of ISS themselves?
Anonymous at Tue, 25 Jun 2024 21:53:37 UTC No. 16253699
>>16253578
Anon, why don't you try calculating the orbital velocity yourself?
[math]v = \sqrt{\frac{G M}{r}}[/math]
Anonymous at Wed, 26 Jun 2024 00:21:06 UTC No. 16253979
If sand doesn't start whirling around you when you walk you may be an NPC.
Anonymous at Wed, 26 Jun 2024 00:45:58 UTC No. 16254016
>>16251939
>So I like to think I know a thing or two about gravitational pull,
You do not. Sorry.
Anonymous at Wed, 26 Jun 2024 02:33:10 UTC No. 16254136
>>16251939
This is why we use math and don't just say "big thing attracts small thing kind of"
Anonymous at Wed, 26 Jun 2024 04:15:34 UTC No. 16254217
>>16252226
Acting retarded is retarded so you can safely assume OP is retarded.
Anonymous at Wed, 26 Jun 2024 04:33:49 UTC No. 16254230
>>16251939
What in the name of fucking schizo rambling is this thread about anon?
>you should start floating on the beach and in the desert
I think it’s time you put the drugs down and get some sleep. When you wake up this thread will vanish from existence and you and all of us will forget this happened.
Anonymous at Wed, 26 Jun 2024 11:45:07 UTC No. 16254596
>>16253578
>Why are astronauts tethered to the ISS?
Because, accidentally or not, with enough impulse (and not much, really), they might float away, . Everything that might do so is tethered. Their tools have straps, their toolbags are attached to them as well, etc. Anything might float away, just as the astronauts. As far as I know, teo toolkits/boxes have been lost that way so far:
https://www.youtube.com/watch?v=lfo
https://www.youtube.com/watch?v=1vX
>They're in free fall, no effect of earth's gravity so they should instead be revolving around the large mass of ISS themselves?
Yes, and they would if they were gently, and very carefully placed in orbit around one another. But, if you use the formula provided by this anon:
>>16253699
You will see that the force is so, so weak, that their orbital velocities around one another would be practically zero. So, anything faster would go beyond the escape velocity of that ISS-astronaut system. This is why, as I said above, not much impulse is needed for things to fly away from each other up there.
I hope that was clear.
Since we're on that topic, a self-propulsion system for astronauts (MMU) was developed by the US Air Force and NASA, and it was tested for reals in 1984: this is a real photo, from mission STS-41B, of astronaut Bruce McCandless II as seen from the space shuttle Challenger. Balls of diamond.
Look it up.
Anonymous at Wed, 26 Jun 2024 11:50:12 UTC No. 16254600
>>16254217
>>16254230
you guys are dicks
Anonymous at Wed, 26 Jun 2024 11:53:44 UTC No. 16254604
>>16254596
>mission STS-41B
relevant timestamp:
https://www.youtube.com/watch?v=rYd