- #36
James Demers
- 70
- 39
I think most commenters have lost the point of the OP's original question, which had to do with the apparent paradox of relative lengths (rod and hole) being different in the two frames of reference. Let's do away with gravity, and acceleration, and rotation and bending. How about the surface with the hole being in motion, on a path 90 degrees to the path of the rod? When the rod reaches the hole, can it pass through cleanly or not? The surface is arbitrarily thin and moving plenty fast; the question is how to resolve the conflicting answers in the two frames of reference: Riding along on the surface, one should see a short rod that easily passes through the hole, but riding on the rod, one would see an approaching hole that's too small to get through.
(I think the answer turns out to be that the rod ends up coming in at an angle, which - within limits - allows it to pass through even if it's "too long".)
(I think the answer turns out to be that the rod ends up coming in at an angle, which - within limits - allows it to pass through even if it's "too long".)