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Topic: This Week's Finds in Mathematical Physics (Week 140)
Replies: 10   Last Post: Oct 27, 1999 9:53 PM

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Posts: 40
Registered: 12/12/04
Re: Flies, trains, and series summation
Posted: Oct 27, 1999 9:53 PM
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Kresimir Kumericki wrote:
> [sci.physics.research removed]
> In sci.physics Chris Hillman <> wrote:

> > On 22 Oct 1999, Phillip Helbig wrote:
> >> The problem being: Two trains are 60 miles apart and approaching each
> >> other at 30 miles per hour. There is a fly flying between the
> >> cowcatchers of each train, at 60 miles per hour, back and forth, turning
> >> around immediately. What is the total distance covered by the fly

The poster is insufficiently lazy. Draw a Feynman-type diagram;
space horizontal, time vertical. The trains' trajectories form a V and
the fly travels a shrinking zigzag (limited by the length of the
fly!). Measure the path length!

Mark L. Fergerson

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