Re: Does The Universe Sping?

Posted by Southern Man on Jul 16, 2002 at 08:04

Re: Does The Universe Sping? (Dogrock)

"I thought Einstein said there is no experiment you could do inside a moving ship that could determine your motion through the water."

Yes, it is difficult to determine motion in a closed system. Motion is relative to something else. In a ship everything can be seen to be moving at the same linear speed with respect to the outside world and so everything inside the ship is not moving linearly with respect to everything else inside the ship. But that doesn’t mean that we can’t determine motion if we can find something “outside” to use as a reference. Or, in this case, we can see rotational motion. Rotational motion doesn’t have the same problem of everything moving at the same speed because things close to the center of rotation are moving faster than things farther out. If you can detect differences due to that difference in absolute speed such as time or space dilations then you can determine rotational speed.

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