CompuServe Messages

Hi, Joe– Welcome to the forum/section! If one ignores the effect of the absence of mass in the tunnel, the gravity would be a mild attraction toward the Earth's center. If the torus is concentric with the Earth and of inner radius "r", then the gravity for someone standing on that inner radius would be that of a denser-than-iron asteroid of radius "r". If the torus removes mass approaching that "asteroid"'s mass, one can no longer ignore its effects; figure the effect a toroidal asteroid would have on objects boring inside it and subtract those vectors from the imaginary asteroid's field vectors. I am not minded to integrate to find such a field pattern; your best place for such details would have been in physics section. –Doug