Re: accruate "sundials"

Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx> wrote:
>On Wed, 22 Jun 2005 21:19:01 +0200, Paul Schlyter <pausch@xxxxxxxxxxxxx>
>wrote:
>
>>Compare this to the same closed and sealed room, where it is impossible
>>to determine if the room is situated in a gravitational field, or if the
>>room is smoothly accelerating.
>
>I've often wondered about the accuracy of this statement. In an
>accelerating room, the force of acceleration is uniform everywhere in
>that room. But how do you create a uniform gravitational field? In
>reality, there will always be a tidal force. The statement that the
>force in an accelerating frame are identical to the force in a frame
>subject to a gravitational field seems only to be true in a limiting
>case (the field produced by a mass at infinity) that isn't physically
>realizable. Or maybe you can create a locally uniform gravitational
>field through some clever superposition of masses?

You can purchase uniform gravity fields at the same place you get your
frictionless pulleys, perfect springs and point masses.


Tim
--
Don't tell me I'm still on that feckin' island!
.

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