It has often been postulated that a hole dug through the center of the Earth, from some location in the United States, would land the burrower in China. But what would be the effects of such a hole? Would jumping through really land one on the other side of the world?
Forget for a second that the project is virtually impossible, would probably cause catastrophic consequences to the planet, and may get you eaten by a T. Rex. Bugs bunny and that ilk aside, the crust (outer covering of the earth; like enamel on your teeth) has never been fully breached. The deepest mine in the world, at this time, is in South Africa and is a reported 3585 meters (or about 2.2 miles) deep. The deepest shaft ever drilled into the Earth is about 15 km (9.3 miles.) The crust extends approximately 35 -70 km below the Earth’s surface. But, lets forget about these facts for the sake of speculation.
If such a hole were excavated, would we survive the trip?, would we need parachutes as we shot through the other side?, or would their need to be a rope to pull us out? Well, lets first have a look at gravity. Gravity is the interaction between two objects. It is measured via the masses of the two objects and the distance between them. Every object in the universe is attracted to every other object via gravity. However, the proximity of the object’s centers determines the strength of the attraction. So, your center (on most people somewhere around their stomach) and the Earth’s center are getting closer. The attraction gets stronger and stronger. You are sucked violently toward the Earth’s core and then … you can go no further. You would need someone on the other end of a rope to pull you out. Maybe you could invent some type of antigravity device that would propel you out of the core and then you would probably have to turn it off and use a parachute after you blasted through the other side.
Another factor would probably be the Earth’s magnetic force in consort with your own. However, I think that gravity would be a much stronger force (as demonstrated by the fact that your magnetism is dwarfed significantly by the Earth.)
So there you have it. A difficult problem solved. Any further thoughts?