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From: cmpbsdb@gitpyr.UUCP (Don Barry)
Newsgroups: net.physics,net.space,net.research
Subject: Re: Star-Wars/Space Telescopes (parabolic mirrors)
Message-ID: <1139@gitpyr.UUCP>
Date: Wed, 4-Dec-85 00:21:52 EST
Article-I.D.: gitpyr.1139
Posted: Wed Dec  4 00:21:52 1985
Date-Received: Thu, 5-Dec-85 07:47:36 EST
References: <384@ukc.UUCP> <26@sbcs.UUCP> <1124@gitpyr.UUCP> <11128@ucbvax.BERKELEY.EDU>
Organization: Georgia Institute of Technology
Lines: 17
Xref: watmath net.physics:3654 net.space:4855 net.research:370

In article <11128@ucbvax.BERKELEY.EDU>, rimey@ernie.BERKELEY.EDU (Ken &) writes:
> No, Saumya is certainly right.  Soap bubbles are certainly spherical,
> even when they sit on circular wire frames.  The force on each piece
> of the surface is equal to the pressure (times the area of the piece)
> and oriented perpendicular to that piece.

An important fact to remember, however, is that a soap bubble has uniform 
tension at every point.  A deformed disk, however, obviously doesn't.  My
point is that all the variables aren't being looked at, and when they are
the figure is probably not going to be anything so nice as a conic section.

-- 

Don Barry (Chemistry Dept)          CSnet: cmpbsdb%gitpyr.GTNET@gatech.CSNET
Georgia Institute of Technology    BITNET: CMPBSDB @ GITVM1
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