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From: tim@ism780c.UUCP (Tim Smith)
Newsgroups: net.physics
Subject: Problem from SYJMF
Message-ID: <273@ism780c.UUCP>
Date: Fri, 17-Jan-86 19:05:28 EST
Article-I.D.: ism780c.273
Posted: Fri Jan 17 19:05:28 1986
Date-Received: Mon, 20-Jan-86 04:04:36 EST
Distribution: net
Organization: Interactive Systems Corp., Santa Monica, CA
Lines: 13

In "Surely You're Joking, Mr. Feynman", ( which is now out in paperback,
so there is no excuse not to have read it... ), he mentions a problem
involving rotating sprinklers ( the "S" shaped ones, that are made to
rotate by a jets of water, thus spraying water all over the area to
be sprinkled ).  The problem is to figure out which way the sprinkler
would rotate if you placed it underwater, and sucked water into the
sprinkler.  Arguments are given in the book for both directions.
His attempted expermental solution yeilded no results before the
explosion ( read the book for more details... ), and he never does
give the answer.  Could someone who knows please post the answer
here?
-- 
Tim Smith       sdcrdcf!ism780c!tim || ima!ism780!tim || ihnp4!cithep!tim