mersenneforum.org What colour is the bear?
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2008-09-09, 21:21   #34
Uncwilly
6809 > 6502

"""""""""""""""""""
Aug 2003
101×103 Posts

100001101100112 Posts

Quote:
 Originally Posted by masser This is similar to my initial line of thought - what if the hunter is on a giant moving iceberg?
The bear is still white. Icbergs come from the same place as polarbears.

2008-09-10, 06:07   #35

"Richard B. Woods"
Aug 2002
Wisconsin USA

11110000011002 Posts

Quote:
 Originally Posted by xilman the North and South poles lie on the earth's rotation axis. That fully fixes the coordinate system.
... depending on one's required degree of accuracy ...

http://en.wikipedia.org/wiki/Image:P..._2001_2005.png

2008-09-10, 11:16   #36
S485122

Sep 2006
Brussels, Belgium

2×787 Posts

Quote:
 Originally Posted by xilman The phrase "travels one mile due east" means "travel one mile towards the longitude of Greenwich while maintaining a constant distance from the north pole (or equator or south pole)". The North American plate is subject to continental drift. Not only is it heading westwards on average, it is also rotating. Pick a spot such that the combination of continental drift and rotation combines such that after drifting west one mile that spot is due south of the starting point. Walk very slowly on the eastward leg of the journey.
I would disqualify this type of solution on the ground that all travelling in the original puzzle refers to ground distances : the reference point for the travel is not some coordinate but the base camp which will travel with the ground all the traveling is done on.

Jacob

2008-09-10, 11:38   #37
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

22×5×7×41 Posts

Quote:
 Originally Posted by S485122 I would disqualify this type of solution on the ground that all travelling in the original puzzle refers to ground distances : the reference point for the travel is not some coordinate but the base camp which will travel with the ground all the traveling is done on. Jacob
Fair enough.

How about: On any continent rotating clockwise, walk 1 mile South. Wait until the continent rotates 30°. Walk 1 mile East. Wait until the continent rotates 30°. Walk 1 mile North.

For counter-clockwise rotating continents, change 30° to 210°.

Note: You may like to start waking sightly before 30° (210°) rotation has occurred so that the rotation during the walking time is also accounted for.

2008-09-10, 14:01   #38
xilman
Bamboozled!

"𒉺𒌌𒇷𒆷𒀭"
May 2003
Down not across

240318 Posts

Quote:
 Originally Posted by S485122 I would disqualify this type of solution on the ground that all travelling in the original puzzle refers to ground distances : the reference point for the travel is not some coordinate but the base camp which will travel with the ground all the traveling is done on. Jacob

It also uses ground distances and the hunter walks a total of three miles over ground to end up at the starting point.

My solution indicates that terms such as "north", "east", "south" are not constant directions with respect to the ground at any given point on the ground (with a few notable exceptions).

Paul

2008-09-12, 09:25   #39
Patrick123

Jan 2006
JHB, South Africa

157 Posts

Quote:
 Originally Posted by xilman Think about my solution. It also uses ground distances and the hunter walks a total of three miles over ground to end up at the starting point. My solution indicates that terms such as "north", "east", "south" are not constant directions with respect to the ground at any given point on the ground (with a few notable exceptions). Paul
Based on your solution, I predict no color for the bear, as by then, they would either be extinct or would have evolved into some other species

2008-09-12, 11:14   #40
xilman
Bamboozled!

"𒉺𒌌𒇷𒆷𒀭"
May 2003
Down not across

281916 Posts

Quote:
 Originally Posted by Patrick123 Based on your solution, I predict no color for the bear, as by then, they would either be extinct or would have evolved into some other species
Not really. The North American plate is drifting at about 3cm per annum. A mile is160934.4cm so it only takes around 50k years. Bears have been around for much longer than that.

Paul

2008-09-12, 14:35   #41
Patrick123

Jan 2006
JHB, South Africa

157 Posts

Quote:
 Originally Posted by xilman Not really. The North American plate is drifting at about 3cm per annum. A mile is160934.4cm so it only takes around 50k years. Bears have been around for much longer than that. Paul
I agree with you there, now if we go back in time, by just 100 years and try and convince the Dodo, the Tasmanian Wolf, .....

Patrick

 2008-09-13, 19:27 #42 Flatlander I quite division it     "Chris" Feb 2005 England 31×67 Posts I wonder if, in a few years time, the puzzle will be: A hunter leaves his boat one morning and swims one mile due south ...
 2008-09-13, 22:42 #43 Kevin     Aug 2002 Ann Arbor, MI 1101100012 Posts Was the title of this thread always "What Color is the Beer"? If so, how come nobody's mentioned it yet?
 2008-09-13, 23:08 #44 Wacky     Jun 2003 The Texas Hill Country 100010000012 Posts When the Meriones unguiculatus were in charge, the reference was to Ursus maritimus. The present administration seem to be more interested in Zymurgy.

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