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- Newsgroups: sci.space
- Path: sparky!uunet!paladin.american.edu!darwin.sura.net!udel!rochester!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!roberts@cmr.ncsl.nist.gov
- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Subject: Re: Acceleration, cats
- Message-ID: <BzqvJ9.MLE.1@cs.cmu.edu>
- X-Added: Forwarded by Space Digest
- Sender: news+@cs.cmu.edu
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
- Distribution: sci
- Date: Thu, 24 Dec 1992 03:39:45 GMT
- Approved: bboard-news_gateway
- Lines: 37
-
-
- -From: gbt@cray.com (Greg Titus)
- -Subject: Re: Acceleration, cats...
- -Date: 23 Dec 92 20:27:45 GMT
- -Organization: Cray Research, Inc.
-
- -In article <Bzq6u7.6AB@news.cso.uiuc.edu> jbh55289@uxa.cso.uiuc.edu (Josh 'K' Hopkins) writes:
- ->pgf@srl03.cacs.usl.edu ("Phil G. Fraering") writes:
- ->
- ->>... some cats have fallen from ten or twenty stories and sometimes
- ->>survived ...
- ->
- ->>What I want to know is, how the ability to fall from 100-150 feet
- ->>up was _selected for_ by evolution. It implies that they went through
- ->>a period of development where cats that could do that were outcompeting
- ->>cats that weren't, to the extent that a large number of cats today can
- ->>do it.
-
- -It turns out that cats have a particular muscular/skeletal arrangement
- -they go into when they enter free fall, which is designed to maximize
- -the shock absorbance of the whole cat and minimize damage to any
- -particular part of it. However, this mode does not work all the way
- -up to feline terminal velocity, with the result that as fall height
- -increases past 10 or 15 feet, cats experience more and more damage
- -upon landing. Above 30 or 40 feet, they are usually very badly
- -injured. However, the tensed-up shock absorbing mode does not last
- -very long. If no landing occurs, then the cat begins relaxing, with
- -the result that a cat falling from 80 to 100 feet lands as a blob, and
- -often has very minor injuries.
-
- I've read that small children often survive long falls with surprisingly
- little injury. It was speculated that they may be more likely to relax
- than adults.
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-
-