No, mathematically, gravity is 0 in the centre of a sphere, where did you get the idea that the centre of the earth would have stronger gravity? |
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So uhh, yea, earlier on today, I was wondering about what happens to the size of the force of gravity as you get closer to the core. |
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No, mathematically, gravity is 0 in the centre of a sphere, where did you get the idea that the centre of the earth would have stronger gravity? |
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Perhaps there would be slight gravity facing outwards. |
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The gravity does get lighter if I remember correctly, BUT, you will have the pressure of hundreds of miles of rock above you. |
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No, because the more rock you have above you, the more it cancels out the rock below you. Gravity at the centre of a ring or a sphere is 0, always. |
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Everything you said there is what I assumed was true before I googled it. |
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The centre of the earth is solid. The outer core, however is molten, but the inner core is still solid. |
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True, true. I was being sloppy, by centre I meant core. |
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Inner core's still solid and if I remember correctly, 10,000 - 15,000 degrees. I don't remember if that's Celsius of Fahrenheit -- probably Fahrenheit |
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Can't believe everything you read on the internet. You probably read it correctly, and it was just wrong. Luckily you were thinking about what you were reading, instead of just accepting everything as fact. |
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Because the material is denser near the centre of the earth, as you approach the core gravity does get stronger, until about 1/2 the way the core, there the gravity is strongest, but from there gravity gets weaker until it eventually becomes 0 at the core. |
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I can totally understand why someone would believe that the force of gravity increases as one approaches the center of the mass. We actually have a formula in Physics that describes the force of gravity between two objects. Better yet, it's dependent on the distance between the two masses as well, where the decreased distance actually increases the force. |
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Are we assuming that this planet is a perfect sphere with a consistent density? In that case, if teleported to the center of the planet, one would probably feel gravity pulling the person apart in all directions. However, few, if any, planets are perfect spheres with consistent densities, though. |
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You wouldn't feel any force. Just consider each atom in your body. How can they be pulled apart in all directions? How would each individual atom move? The key point is that it's the sum of all the forces which counts, and at the centre of the Earth, they sum to the 0 vector. None of the atoms in your body would move anywhere, so you wouldn't feel anything. It'd just feel like falling, without the wind. |
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So, with no gravity, there would be no pressure, right? If you fell down the elevator shaft would you fall all the way to the center? Or would you slow down until you started floating? Would you fall back up to the halfway point? Like bungee jumping? I always assumed that it was the center of the mass that was the center of gravity. But of course there couldn't be any gravity because there is no more 'down' to fall. Just like at the north pole you can't go in any other direction except south. At the center of the Earth all directions are up. |
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Pressure, density, and gravity are all related on a deep level. This is inclusive of time as well. Basically, pressure can be seen as a scalar quantity dependent on the acting normal force maintained from the surface of the earth. With depth comes density comes an increase in gravity; thusly pressure, and in turn a change in the passage of time relative to an observer from some arbitrary distance with other conditions, but that's not very relevant. Anyway, the pressure one would experience at the center of the earth would be appreciable - about 3.5 megabar - however, gravity itself would diminish at some relation, as others have said, due to the surrounding mass in all directions causing a null, or zero, resultant vector. Even with a perfect cylindrical tube cut to the center of the earth, which could never happen, the air pressure alone would be enough to obliterate any human or human-made device long before it reached the center. |
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Last edited by Phion; 06-22-2010 at 04:48 AM.
Interesting. It's weird to think such high pressures could exist at the centre of the Earth where there's no gravity. I suppose this is because the atmosphere above and below you is acting like a heavy cork, keeping the local atmosphere around you squashed in. |
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So there could be no Zion from the Matrix. |
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...that was underground, in the sewers. Not the centre of the Earth. |
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Could there be a 'The Core'? Haha, probably not. |
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Maybe there is a mini-stabilized blackhole at the center of the Earth? dun dun dun... |
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