ArmitageShanks
Topic Author
Posts: 3780
Joined: Tue Dec 30, 2003 5:30 am

### Digging A Hole?

Hypothetical question:

Lets say I started to dig a 10 foot wide hole from my backyard to the exact opposite side of the earth. What would happen to gravity when I reached the centre of the earth and started to dig up (or would that still be down)?? If I made it all the way through, how would that be physically possible?

What would happen if I jumped in the hole?

N766UA
Posts: 7865
Joined: Thu Jul 29, 1999 3:50 am

### RE: Digging A Hole?

Maybe you'd just explode?

Twistedwhisper
Posts: 689
Joined: Mon Aug 18, 2003 11:52 pm

### RE: Digging A Hole?

My guess is that you'd be floating....? Slightly towards the moon....

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

### RE: Digging A Hole?

Actually, the further down you'd go, the lesser you would weight.

Weight force is at maximum at the surface of the Eart, decreases on a square root ratio if you go up, and decrease (on a 3 root ratio I believe, but not sure) if you dig your way down.

707

Sonic
Posts: 1505
Joined: Mon Jan 24, 2000 3:10 am

### RE: Digging A Hole?

You would burn, as it is hotter the more down you go. Also, certain parts of earth are liquid and thus you wouldn't pass through if you jump (nor you would be able to dig there).

photopilot
Posts: 3101
Joined: Mon Jul 15, 2002 11:16 am

### RE: Digging A Hole?

Here you go. Everything you wanted to know about what's inside the earth.
Here's the link to the whole slide presentation.
http://lewis.up.edu/mcs/wasowski/sci110/TnTkCh05/sld003.htm

Here's the relevant slides.
The Lithosphere

The Crust - Mantle - Core

As an analogy. If the earth were an apple, the deepest depth ever dug by man in the world's deepest mines, wouldn't even be deep enough to get through the apple's skin. Think about that.
Steve

JetService
Posts: 4611
Joined: Mon Feb 21, 2000 1:12 pm

### RE: Digging A Hole?

You'd be deafened by the loud whistling noise the Earth would make as it hurls through space.

tbar220
Posts: 6706
Joined: Wed Feb 02, 2000 12:08 pm

### RE: Digging A Hole?

Yea, I think force due to gravity is inversly proportional to the radius of the earth squared. So the further down you go (ignoring effects of heat), you would feel less and less in weight. Once you get to the center, if the earth where the only object in the universe, you would probably just float because you would be at the center of gravity and mass of the entire system.
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ArmitageShanks
Topic Author
Posts: 3780
Joined: Tue Dec 30, 2003 5:30 am

### RE: Digging A Hole?

So, if I dove in the hole I would just kind of stop and hang in the middle.

maiznblu_757
Posts: 4952
Joined: Fri Mar 01, 2002 12:05 pm

### RE: Digging A Hole?

You would weigh more all the way down to the center, but, you would stop because the gravity is equal all the way around the circumfrence of the earth... There would be an equal force each way... You may crush....

[Edited 2004-02-23 03:43:29]

N766UA
Posts: 7865
Joined: Thu Jul 29, 1999 3:50 am

### RE: Digging A Hole?

I ammend my prediction.....

You would implode.

sleekjet
Posts: 2008
Joined: Sat Jul 28, 2001 1:35 am

### RE: Digging A Hole?

What you'd find along the way: Bill Buckner's firstbaseman's mitt, chads from the Florida ballots, the missing 727 from Africa, all of JCS's unsigned report cards from elementary school, and the end of the uploaded a.net picture queue.
II Cor. 4:17-18

prosa
Posts: 5389
Joined: Sat Oct 27, 2001 3:24 am

### RE: Digging A Hole?

You can pick up a shovel for ten bucks at Home Depot or Lowe's. Why not find out for sure? You can post your results in the Trip Reports forum
"Let me think about it" = the coward's way of saying "no"

MD11Engineer
Posts: 13916
Joined: Sun Oct 26, 2003 5:25 am

### RE: Digging A Hole?

Provided Earth would be solid and a perfect sphere, gravitational force would decrease with increasing depth because the forces of all the layers above you would cancel each other out and onkly the amount of mass between you and the center would attract you. At the center you would be weightless.

An object thrown into a borehole right through the planet would (provided no friction) oscillate through the center.

jan
Je Suis Charlie et je suis Ahmet aussi

maiznblu_757
Posts: 4952
Joined: Fri Mar 01, 2002 12:05 pm

### RE: Digging A Hole?

This is deep... LOL.. Very interesting to think about. I never thought about it, but, brainstormed and came up with my synopsis.. I think its pretty close to what would happen..

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