0 upvotes, 2 direct replies (showing 2)
View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
For an outside observer you would see it moving extremely slow it would be time contraction it's only length contraction for the people or thing that are moving fast. But if somehow it could be infinity stretchy your outside part of the disk would start appearing to move slower than the inside since the tangential velocity would be greater on the outside than the inside of the disk but yeah it doesn't really work out like that given material properties in the real world
Comment by twoTheta at 20/07/2022 at 21:14 UTC
8 upvotes, 1 direct replies
This is not correct. It would still appear to be moving quickly. Time dilation is an effect when comparing measurements between two frames.
You are using a time measured in one frame (the rotating one) to do a calculation in the other frame (the ground). This is a big no-no! To determine the velocity in the ground's frame, you need both the distance traveled and time measured in the grounds frame.
Comment by TheTurtleVirus at 20/07/2022 at 20:11 UTC
1 upvotes, 1 direct replies
Well time would appear to be moving slow but the disk would still appear to be moving fast correct? If it's traveling near the speed of light, it would look like it's traveling near the speed of light. And length contraction is seen only from outside observers correct? It's been a few years since I studied relativity.