Re: An interesting SR puzzle

From: robert j. kolker (nowhere_at_nowhere.net)
Date: 02/08/05 

Date: Mon, 07 Feb 2005 22:48:52 -0500

jgreenfield@seol.net.au wrote:

> Try this clock test for gravitational time dilation:
> Erect a high vertical rotating shaft, which physically operates a
> clock/counter attached to the bottom and top.

You are assuming the shaft is rigid. It is not. The notion of rigid body
is an idealization and does not exist in the real world. If rigid bodies
really exist you could use a very long rigid rod to send messages faster
than light.

Bob Kolker

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