Possibly in the hollow core you describe something different might happen. It seems to me (and I may be wrong) that the person would experience a slight centrifugal force that would hold him to the shell. I would guess that the larger the hollowed out area the more g-force pushing him to the wall as the relative velocity increases. He would feel weightless until he came into contact with the wall of the shell. This is assuming of course that the hollow still rotates with the rest of the planet.Janus said:A. He would float. He would also float if you put him anywhere within the hollow shell of the Earth. Gravitational forces cancel out at all points within a hollow sphere not just at the center.