Re: [PSUBS-MAILIST] Quiz question

[irox <irox@ix.netcom.com>]

I think I might have posted it, but I can't find the email.

If it turns up I'll pass it a long.

Cheers,
  Ian.

-----Original Message-----
>From: "Sean T. Stevenson" <cast55@telus.net>
>Sent: Feb 25, 2008 6:23 PM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Quiz question
>
>James - I remember what you are talking about:  counterintuitive questions
>regarding buoyancy.  I don't remember what they were, apart from the one that
>you refer to specifically.  
>
>In that one, the level of the lake will fall.  If we can assume that the density
>of rock (unspecified) is greater than the density of the lake water, then when
>the rock is in the boat, it displaces a volume of lake water equal to the weight
>of the rock.  When the rock is thrown overboard, it sinks to the bottom (i.e.
>its weight is no longer balanced by the buoyancy force), and displaces a volume
>of lake water equal only to the volume of the rock.
>
>-Sean
>
>
>Quoting James Frankland <james@guernseysubmarine.com>:
>
>> Does anyone have a link to those 3 sub related quiz questions that were 
>> posted a while back.
>> 
>> It was just  a few fun questions.
>> 
>> There was one with a man sat in a boat on a lake with a large rock in the 
>> boat.  The question was that if he chucked the rock overboard, did the water
>> 
>> in the lake rise or fall?
>> 
>> My Dad is doing a quiz for the local yacht club and has asked me for some 
>> ideas that might get people thinking.  I thought that would be a good one 
>> for people.
>> 
>> Can anyone remember what i mean?
>> Thanks
>> James 
>> 
>> 
>> 
>> 
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>
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