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From: vsh@pixdoc.UUCP (Steve Harris)
Newsgroups: net.puzzle
Subject: Re: Barge problem
Message-ID: <28@pixdoc.UUCP>
Date: Tue, 26-Nov-85 20:35:00 EST
Article-I.D.: pixdoc.28
Posted: Tue Nov 26 20:35:00 1985
Date-Received: Fri, 29-Nov-85 21:23:12 EST
References: <51100001@hpcnof.UUCP>
Organization: Pixel Systems, Woburn, MA
Lines: 19

When the scrap iron is thrown overboard, the water level goes DOWN.

When the iron was in the boat, it displaced water equal to its own
weight.  When it sinks to the bottom, it displaces water equal to its
own volume.  Since the iron is denser than the water (it sinks), less
water is displaced and the water level goes down.  (The rest of the
barge continues to maintain equilibrium).

Followup question:

The barge goes up relative to the surface of the water.  However, does
the barge go up, down, or stay at the same level relative to the lock?
What information do you need to answer this question?
-- 

Steve Harris            |  {allegra|ihnp4|cbosgd|ima|genrad|amd|harvard}\
Pixel Systems Inc.      |               !wjh12!pixel!pixdoc!vsh
300 Wildwood Street     |
Woburn, MA  01801       |  617-933-7735 x2314