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Okay, I have seen the calculation for how long it takes to fall through the Earth if you had an evacuated hole all the way through it from pole to pole. The problem is that they always assume a constant density for the Earth, and in reality it is far from that. In fact I just watched a YouTube video where a fame physicist, who shall remain nameless said that at halfway the force of gravity would be about half of what it was at the surface. He could not have been more wrong. At about half way you are at the outer core/mantle boundary and your acceleration is actually about 10.8 m/s^2 or 1m/s^2 higher than it is at the surface.

So my question is can any physics people give me an answer better than the 42 minutes estimated for a constant density Earth? Here is a link to a Wiki article on the structure of the Earth:http://en.wikipedia.org/wiki/Structure_of_the_Earth" [Broken]

They have a couple of helpful graphs there. They show density as you approach the center and g as you approach the center. I am estimating 35 minutes rather than the standard 42 minutes for a uniform Earth.

So my question is can any physics people give me an answer better than the 42 minutes estimated for a constant density Earth? Here is a link to a Wiki article on the structure of the Earth:http://en.wikipedia.org/wiki/Structure_of_the_Earth" [Broken]

They have a couple of helpful graphs there. They show density as you approach the center and g as you approach the center. I am estimating 35 minutes rather than the standard 42 minutes for a uniform Earth.

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