hello people i need ur help on sumthing.

me and my mates were talking about sumthing at college today about the earth. i sed that if you dug throgh the earth and kept digging to the other side of the earth, your feet would come out first, like if you dug from england to australia, you be digging down but when you reched australia the people in australia would see your feet coming up threw the ground first... my mates laughed at me, but its right innit? i know the earth has a hot bit in the middle but if you imagined it, its right, innit? though i dont know if you would fall upwards towards the sky.

cheers

crumpet.

good site, too!

from the centre of the earth you would have to climb outwards due to gravometric effects

Quote from: Sweensterfrom the centre of the earth you would have to climb outwards due to gravometric effects

thats what i mean, youd climb out feet first in australia.

upside down climbing?

would be interesting to try

imagine trying to climb a cliff upside down, remember once you pass to the other side of the centre, gravity will be pulling you back to the centre

Na, youd come out head first.

no gravity then feet first.

With gravity it would be like trying to dig a hole in your ceiling while standing on the ceiling. It aint gonna happen.

Try it and let me know :-)

Surely itd depend on the way you dig ?

i.e.
Dig head first, then youd pop out head first.
Dig feet first, youd pop out feet first.

(ignoring gravity, as tbh, if you take it into account then youd burn before you got anywhere near half way).

the question is pointless then...

like asking if you stuck your finger through a pie would your fingertip come out the other side

the pressure at the centre of the earth is the biggest problem, hence the molten core because of the pressure.

Any scientific question on here gets pared down and simplified so savagely that it becomes a complete irrelevance

How can you ignore gravity in a question like this?  Thats just like saying "if I crawl through a tube, will I turn round in the middle" :S

Quote from: funkychicken9000Thats just like saying "if I crawl through a tube, will I turn round in the middle" :S

thats y i sed ignore the hot bit and gravity... if u did, ur feet would pop out first.



see ur feet would come out first, i think i am rite, to be honest.

well obviously if you work your way through an object with no gravity constraints you will end up at the other side in the same direction you went in

but that is like asking if i walk down this straight road facing forward when i get to the end will i still face forward.

pointless

Quote from: funkychicken9000Any scientific question on here gets pared down and simplified so savagely that it becomes a complete irrelevance

How can you ignore gravity in a question like this?  

So whats the acceleration due to gravity near the centre of the earth? (at the centre itll be zero as itll be the same in all directions) And how many Veyron engines will he need pulling him to escape from it?

Though - according to http://hyperphysics.phy-astr.gsu.edu/hbase/orbv.html

QuoteIf you drilled a hole through the center of the Earth, the acceleration of gravity would decrease with the radius on the way to the center of the Earth. If the Earth were of uniform density (which it is not!), the acceleration of gravity would decrease linearly to half the surface value of g at half the radius of the Earth and approach zero as you approached the center of the Earth.

So you could ignore gravity as itll get less the further down he goes... :shock:

Its a relatively simple question, the portion of the earth between you and the surface attracts you, so in effect "cancels" some gravity.  I did the calculations back in college as part of a sort of thought experiment, turns out if you jump down a tube through the earth you oscillate around the centre point by SHM  This assumes constant density of course.

[edit] and you cant ignore gravity, because as he goes through the centre and towards "australia", gravity increases again.  Youd need quite a ladder though tbh...

Nothing at all would come out, firstly it would take you hundreds, if not thousands, of years and secondly you would end up crisped by the heat before you got anywhere near the core.

Lastly it depends on which way you fancy digging what way you would come out, notmally you would turn around after the core so your feet are pointing inwards byt if you didnt then you would go out feet first.