A special rock with it's own gravitational accelaration. Does anybody know anything?
138866
It would have to be a VERY large rock to have an acceleration of 2 m/s^2. That is even greater than the moon's gravitational acceleration. Even if your rock was incredibly dense, it would still have to be huge. I think this has to fall in the realm of pure fantasy.
127943
I never knew about this but heres a quote from a website.  This is pretty cool stuff!  Also, he reported that he was "silenced" by thugs  who beat him up and never spoke of his discoveries again after that, sad world.\nQuote:\n\n"Scientists cannot explain how Leedskalnin built coral castle. It was featured on IN Search of with Leonard Nimoy. He moved coral stones weighing as much as 28 tons with equipment designed to only lift 10 tons, and only lift it, not move it. People spying on him with binoculars signed sworn affidavits that they saw coral stones weighing tons, floating in the air like helium balloons.\n\nMy best guess is: He put a strong negative electric charge on them, (at night to avoid the photo electric effect) and the Earth's magnetic field pushed up on them and they floated.\n\nAccording to him, a strong negative charge is really filling it with south magnetic pole units and the whole stone becomes a south magnetic monopole.\n\nI experimented and made a cement brick weighing 15 pounds, to weigh 13 pounds. Did it twice and never tried it again."\n\nIn response to the answer below..  I wasn't trying to declare this as fact I was quoting someone else.  And My enthusiasm was for the trivia not for a new scientific discovery.  Obviously, if it were true then it would be replicated as all science works.  Go easy on me :)  Interesting to note that the user below has been suspended
826335
This is just like that watch question right? Well there is a possibility that the perfectly polished rock got perfectly polished by random unintentional events. The divine polisher is therefore time. But then maybe the rock in reality is not actually beautifully polished but we perceive it that way, because of the limitations of the human mind. And maybe when we say that the universe is complex and that complex things need a craetor, maybe it is not complex, we just perceive it that way. There is no ultimately creator.
335694
For the first case A marble on a (perfectly) flat surface, will remain in that state until energy of some kind is added.\n\nFor the second case to be as close to perfect conditions you would need to have a moving object out in deep space away from other bodies, because gravity will always be an effect, and in space to avoid the friction of the air.\n\nBut in simple terms the same marble on the flat surface give a push will move until external forces stop it, friction from the air and from contact with the surface.
432870
"Scientists using NASA's Rossi X-ray Timing Explorer have estimated the depth of the crust on a neutron star, the densest object known in the universe. The crust, they say, is close to a mile deep and so tightly packed that a teaspoon of this material would weigh about 10 million tons on Earth."\n\nhttp://spaceflightnow.com/news/n0604/24starquake/
616786
The Rock Jesus Christ.
1169746
Believe it or not your question was the trivia question on some rock site to win a prize. They haven't posted the answer as i can see, but i'll give you the link and maybe you can email them for the answer.
449007
It's not a gimmick, it's an illusion , the same as the mtatlic hill, you're going down but it looks lie uoi are going backwards,something to do with physics, ask the physic' pro's for the deep, lengthy answer, they're good!
1163228
...Junyong, you sure seem to have a habit of passing all your homework assignment onto us - hoping that we will do it all for you, so that you can simply copy and paste it directly into your worksheets ! \nYou MUST learn to do your homework by yourself, dear - because others will not be around to help you in your final examinations, and you will also be having no first-hand knowledge of what can be found where !\n'Science fiction' is a highly technical field, and the current market rates for even the shortest (but technically correct) piece are around US $ 500/- ! Nobody is going to bother write one for you - in return for the points they get !\n...I'll give you some tips, though : Geology is the science that deals with the history of the earth as recorded in rocks. So, you could write a tale about a rare piece of rock that a child accidentally finds in their garden - which has an unusual gleam. The child's parents think it must be a semi-precious stone - and take it to be evaluated by a jeweller. He tests it, looks shocked, and secretly phones up the Space Research people. They come, examine it, and look even more shocked : The secret is finally revealed - that it is NOT from our Earth at all - but a unique specimen that must have come from a meteor [speedily flying fragment of rock, which has broken off from some other planet !]. \n...Since they already have samples from the Moon and Mars, the scientists feel certain that this stone is NOT from either - as its constituents are different. \n...Then where is it from ? And how did it fall into the garden of this child's home ? Have any other such pieces been found, or reported ?    \n....The answer comes from the least expected source !....\n...I've given you the outline. Now, be a dear, write the story in your own words, and give it a surprising ENDING - to show how clever and imaginative you really are. \n[On purpose, I've not ended the story !]\n...Best of Luck, dear.
442513
The gravitational force holds it into a spherical shape.
918781
Where is your freebody diagram? There are other forces acting on the block than just gravity...\n\nGood Luck
1162679
There is one, that if you were to do it and found a way to publish the results, a lot of common people would be very interested.  It is the formation and collapse of a gravitational field.\n\nWere you to go to http://timebones.blogspot.com   and then to the November Archive, toward the bottom of that month you shall find "How to Form and Collapse a Gravitational Field".  What I have suggested has been done by myself, but I have never found anyone interested in the results.
840902
there's this nifty little thing called gravity? look it up
348469
Too long to list:\nhttp://seis.natsci.csulb.edu/bperry/ROCKS.htm\ngood site
887609
the rock starts as magma turns into igneous then to sedimentary the metamorphic....extreamly siplified but i think u get the point\nheres what a more complex on looks like\nhttp://geologyonline.museum.state.il.us/tools/lessons/6.4/rockcycle.gif
802571
wow...in 1968 i watched what appeared to be a shiny metallic piece of  crumpled metal tumble towards earth for 10 minutes, it was probably space debris or toilet ejecta from a passing airliner.what you seen was likely hardboard insulation like they use on construction sites, that stuff will fly a long ways with little wind....or else it was a runaway magic carpet
653943
gravity and inertia\n\nread more below. It is really fascinating.