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        riddles >> easy >> cork bottle coin
        
(Message started by: karan_sikka1 on May 6^th, 2004, 12:46am)

Title: cork bottle coin
Post by karan_sikka1 on May 6^th, 2004, 12:46am

i think the answer to it is that you heat the bootle so that the cork will come out due to pressure.here you r not opening the cork on your own but due to pressure as in shampign.so after the cork is removed u can .............

Title: Re: cork bootle coin
Post by evergreena3 on May 6^th, 2004, 6:10am

Karen,

Please post the question. Thanks!

EverGreenA3

Title: Re: cork bootle coin
Post by towr on May 6^th, 2004, 6:52am

It's from the easy section on the puzzle-site, http://www.ocf.berkeley.edu/~wwu/riddles/easy.shtml
And it's now in the header as well..

Title: Re: cork bootle coin
Post by Sameer on May 6^th, 2004, 7:24am

And isn't there a thread alreayd on this?

Title: Re: cork bootle coin
Post by towr on May 6^th, 2004, 9:15am

quite probably :P

Title: Re: cork bootle coin
Post by Three Hands on May 6^th, 2004, 11:38am

Karan, I'd have thought that pushing the cork into the empty bottle would be easier, require less preparation, and take less time...

Not that your answer doesn't show a bit more ingenuity, of course ;)

Title: Re: cork bootle coin
Post by evergreena3 on May 6^th, 2004, 1:18pm

Yeah, I thought to push the cork into the bottle, too.

Title: Re: cork bootle coin
Post by towr on May 6^th, 2004, 1:23pm

You could just melt the glass ;)
Or cut it (cutting isn't breaking)

Title: Re: cork bottle coin
Post by Speaker on May 10^th, 2004, 7:13pm

I like heating the bottle. This way you do not need to touch the cork. So, by changing the question we could make it a little harder. I like this new answer, very nice karan. :D

Title: Re: cork bottle coin
Post by rmsgrey on May 11^th, 2004, 3:53am

It's possible to extract the coin without doing anything to the apparatus - get a friend to do it - or leave it over a hole with an powerful magnet below and wait for the coin to fall through the glass...

Title: Re: cork bottle coin
Post by Speaker on May 11^th, 2004, 7:51pm

To have the coin fall through the glass, are you using the properties of the glass as a liquid. Because if you are, then maybe the magnet (as opposed to gravity) would only shorten your wait by a very short time. If you wait long enough the coin will sink into and then out of the glass.

Title: Re: cork bottle coin
Post by towr on May 12^th, 2004, 12:26am

You'd have to wait very very long. Glass is[e]~~n't~~[e] very viscous, much [e]~~less~~ more so[/e] than popular myths suggest. Chances are the coin will never 'sink through' the glass.

Title: Re: cork bottle coin
Post by rmsgrey on May 12^th, 2004, 2:31am

I think the properties vary depending on the glass. Besides, if you create a deep enough potential well nearby, you develop an appreciable chance of quantum tunneling. Of course, by that point, you've probably given the coin enough energy to punch its way out through the glass anyway...

But if you're willing to wait (and the bottle survives long enough), sooner or later the coin will pass out of the bottle. The reason for the magnet is to try and increase the pressure on the coin without affecting the rest of the bottle.

Of course, all of this is needlessly complicated. All you need to do is redefine your references system so that what was previously "inside" the bottle is now "outside"...

[edit] Upon rereading, Towr surely meant to say that glass is very viscous - low viscosity fluids such as air don't do much to prevent denser objects sinking (or less dense objects rising)[/edit]

Title: Re: cork bottle coin
Post by towr on May 12^th, 2004, 2:44am

on 05/12/04 at 02:31:47, rmsgrey wrote:

[edit] Upon rereading, Towr surely meant to say that glass is very viscous - low viscosity fluids such as air don't do much to prevent denser objects sinking (or less dense objects rising)[/edit]

What I meant is that glass has a very high resistance to flow (despite it not being crystaline)
Frankly I was just guessing at what viscous meant ;)

Anyway..
If you use an electromagnet with a high frequency the coin might get hot enough to melt through the glass..

Title: Re: cork bottle coin
Post by Cathos on May 12^th, 2004, 12:03pm

Funny this should be brought up - A freind of mine posed a riddle to me yesterday, reffering to glass as a liquid. I told him the riddle was incorrect, glass was a solid. I was always told it was an amorphous solid, as opposed to a crystaline one, and that allowed it warp or "flow" after a while. So which is it? I'm sure there are much more learned minds out here that could set the record straight. I seem to remember something about this in posts long ago, I thought it was Icarus or Towr who posted it, but I don't remember where.

Title: Re: cork bottle coin
Post by towr on May 12^th, 2004, 12:19pm

For general information http://en.wikipedia.org/wiki/Glass
And whether it flows, specifically http://en.wikipedia.org/wiki/Glass#Does_glass_flow? (same page, but further down)

Title: Re: cork bottle coin
Post by Cathos on May 12^th, 2004, 8:35pm

Ah, just as I thought. Thanks for the info.