Author Topic: Apple in space?  (Read 4759 times)

Farabi

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Apple in space?
« on: June 20, 2015, 04:05:29 PM »
When apple floating arround in the space, did it create a tiny gravity? Anyone can tell me this? And did the sattelite in space create gravity arround it even though it small?
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rrr314159

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Re: Apple in space?
« Reply #1 on: June 20, 2015, 04:08:28 PM »
Sure
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hutch--

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Re: Apple in space?
« Reply #2 on: June 20, 2015, 04:11:46 PM »
I doubt that an apple would fare all that well in a vacuum but on the other hand, space is very cold if not in direct line of the sun so the apple may be so cold that it remains solid. Yes it would have a gravitational effect if it was far enough away from larger objects with much larger gravitational fields but it would be very small.
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rrr314159

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Re: Apple in space?
« Reply #3 on: June 20, 2015, 05:24:45 PM »
Vacuum won't affect an apple. Do you think it would explode without air pressure to hold it together? No. Anyway it would freeze solid ... except for the sun. That would cause it to boil away after a while, but of course the vapor would have exactly the same mass and gravity.

It definitely has a gravitational field regardless of proximity to larger objects. When included in the stress-energy tensor it's going to stay there regardless of the size of other entries, and contribute its mass to the computation of g. After all they've detected the gravity of very small masses here on Earth, in the lab (not quite as small as an apple, last I heard).

U need to read Wittgenstein more carefully! He actually understood all of physics, including GUT (to him it's child's play), chaotic inflation (he knew where all those missing gravitational degrees of freedom were hiding!), primordial nucleosynthesis, Harrison-Zel'dovich spectrum, quarks, Higgs boson (anticipating the discovery they'll make next year, that it's actually a triplet), all of Hawking's results including the Black Hole - Thermodynamics connection ... it's all there in Tractatus! But very, very cryptic!
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K_F

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Re: Apple in space?
« Reply #4 on: June 20, 2015, 06:25:00 PM »
It'll boil away on the sun side and maybe freeze on the shade side... either way, it'll eventually disappear.
It'll have a teeny weeny amount of gravity.. all mass has.
Maybe a fruit fly-astronaut could orbit it  :biggrin:
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hutch--

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Re: Apple in space?
« Reply #5 on: June 20, 2015, 06:50:41 PM »
I have heard many things over time that are supposed to be attributed to Wittgenstein's Tractus but prediction of the future in as then undiscovered physics has not been one of them. Perhaps you could add this to the list of other discredited Tractatus based theories floating around in the land of speculative metaphysics.

Humpty Dumpty sat on the wall,
He had a great fall when down came the spider,
So when little miss Muppet got up off her tuppet
He landed in her curds and whey
And invented the first omelette.
And after she cooked it then
Even all the kings horses and all the kings men,
Couldn't put Humpty back together again.
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dedndave

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Re: Apple in space?
« Reply #6 on: June 20, 2015, 11:42:37 PM »
1) the apple is not held together by external pressure, alone   :biggrin:
google "covalent bonding" or "ionic bonding"

2) yes - it creates it's own tiny gravitational field, as does any mass
if an item has mass, it has gravity
if it has gravity, it's assumed to have mass, as well

gravity is essentially the interaction between 2 (or more) items that each have mass
i.e., Newton's apple fell to the ground, not because of the earth alone,
but because both the earth and the apple have mass

Farabi

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Re: Apple in space?
« Reply #7 on: June 21, 2015, 01:28:30 PM »
Ah yeah, I C.
So it seems all thing had masses will create a gravitational field. Which is the heavier one? I mean the field. Apple or iron? I think at some degree the sattelite where astronout lives create some gravitational field. It kinda made me curious about this.

Somehow, people can grow plants in space, and I heard ants take part in the experiments too. But, human body fluid are not designed for space, if we are too much exposed on a 0G our body will gradually reformed. But I dont know whether our body have calculate such a condition or not.
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dedndave

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Re: Apple in space?
« Reply #8 on: June 21, 2015, 01:55:56 PM »
it depends on the mass of the objects
you should take a college physics course   :t

the force is proportional to (M1 x M2) / D2

where M1 and M2 are the masses and D is the distance from center to center

(weight is a measure of force)

K_F

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Re: Apple in space?
« Reply #9 on: June 21, 2015, 07:05:09 PM »
We're 'designed' for living at sea-level, 1-G and 1-Atmosphere pressure, which keeps us together.
People can live at higher altitudes, and their bodies do undergo changes to adapt to these conditions.

The only problem at higher altitudes, is that one has less protection from the 'Solar onslaught' of high energy particles, extreme temps and no pressure (if in space).
This all adds up to tear apart whatever is up there.
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hutch--

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Re: Apple in space?
« Reply #10 on: June 21, 2015, 07:55:01 PM »
Here is a quantum pun, if the apple has nothing near it, does it have gravity ? If it has something near it then that something may be interacting with the apple so it has gravity. Its the standard dilemma, by itself you don't know, to know is to interfere with it.  :P
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rrr314159

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Re: Apple in space?
« Reply #11 on: June 22, 2015, 01:29:46 AM »
According to Bishop Berkeley if no one observes it there's no gravity ... now there was a philosopher!
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hutch--

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Re: Apple in space?
« Reply #12 on: June 22, 2015, 03:06:36 AM »
This form of analysis is highly solipsist but then I have heard this form of logic before.

Rose are red,
Violets are blue,
Nonsense is nonsense,
Even from you.  :biggrin:
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rrr314159

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Re: Apple in space?
« Reply #13 on: June 22, 2015, 03:08:49 AM »
Nonsense is nonsense, even from Wittgenstein. I'll bet u haven't even read Berkeley?
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hutch--

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Re: Apple in space?
« Reply #14 on: June 22, 2015, 03:34:04 AM »
 :biggrin:

It sound like you have from your arguments.  :P Its the Alice in Wonderland stuff that makes your style novel.
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