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Path: utzoo!watmath!watdcsu!dmcanzi
From: dmcanzi@watdcsu.UUCP (David Canzi)
Newsgroups: net.misc,net.physics
Subject: Re: perpetual motion
Message-ID: <1153@watdcsu.UUCP>
Date: Fri, 22-Mar-85 22:02:04 EST
Article-I.D.: watdcsu.1153
Posted: Fri Mar 22 22:02:04 1985
Date-Received: Sat, 23-Mar-85 01:58:05 EST
References: <608@vortex.UUCP> <368@talcott.UUCP> <144@uwvax.UUCP>
Reply-To: dmcanzi@watdcsu.UUCP (David Canzi)
Organization: U of Waterloo, Ontario
Lines: 15
Xref: watmath net.misc:7601 net.physics:2276
Summary: 

>Well, I was more under the impression that most so-called Perpetual Motion
>Machines were never really that -- but rather got their energy from the
>Earth's rotation and things like that.
>
>As for vacuum PMM's, go out between the galaxies somewhere and spin a 
>frisbee inside a perfectly evacuated box.

Won't work.  Because the frisbee is an extended body and is not perfectly
rigid, the tidal forces caused by the nearest galaxies will eventually slow
it down and stop it.
-- 
	David Canzi

"Women compromise more than a third of Britain's work force."
	-- The Vancouver Sun