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- Newsgroups: sci.physics
- Path: sparky!uunet!destroyer!cs.ubc.ca!newsserver.sfu.ca!news
- From: palmer@sfu.ca (Leigh Palmer)
- Subject: Re: 3-sided coin
- Message-ID: <1992Nov17.202623.15201@sfu.ca>
- Sender: news@sfu.ca
- Organization: Simon Fraser University
- References: <1dsj4gINNeuh@agate.berkeley.edu> <1e98b8INN6s@manuel.anu.edu.au>
- Date: Tue, 17 Nov 1992 20:26:23 GMT
- Lines: 19
-
- In article <1e98b8INN6s@manuel.anu.edu.au> butler@rschp2.anu.edu.au (Brent
- Butler) writes:
- >The solution to this problem is simple. When a coin is flipped it
- >will *come to rest* in a position that represents a minimum in its
- >(gravitational) potential energy. For a real coin this means one
- >of its two faces with equal probability - it will never *come to
- >rest* on its edge even though it has a finite area because this is
- >a metastable state.
-
- It is a stable state. A finite displacement from equilibrium (or a most
- unlikely quantum process) is required for it to topple; that is a stable state.
- If it is not, then either "heads" or "tails", whichever has the lower energy,
- is also a metastable state.
-
- I have a colleague, Dan Murray, who did experimental and theoretical work on
- the problem of coins landing on edge while a graduate student at Guelph
- University in Ontario. He has a videotape showing a coin landing on edge.
-
- Leigh
-