Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!boingo.med.jhu.edu!haven.umd.edu!mimsy!uunet.UU.NET
From: mailrus!ulowell!dlogcher@uunet.UU.NET (Dutch)
Newsgroups: rec.guns
Subject: Re: Speed of Sound
Message-ID: <35663@mimsy.umd.edu>
Date: 14 Jun 91 20:05:55 GMT
Sender: magnum@mimsy.umd.edu
Organization: University of Lowell Center for Productivity Enhancement
Lines: 33
Approved: gun-control@cs.umd.edu

#Article 5993 of rec.guns:
#From: bercov@bevsun.bev.lbl.gov (John Bercovitz)
Newsgroups: rec.guns
Subject: The Speed of Sound
Date: 13 Jun 91 01:59:45 GMT

#The speed of sound is referred to fairly often in this newsgroup and
#occasionally there are quantification errors.  If we ever start a FAQ,
#the following might be useful.

#The speed of sound in air is (kgRT)^0.5.  Notice that the only variable
#is T.  So the velocity of sound doesn't depend on its pressure.  Subbing
#in values for k,g,and R with degrees Rankine for an input and feet per
#second for an output: c = 49*(T)^0.5 to about four significant places.
#Rem: To get to degrees Rankine, add 460 to degrees F.
#Example:  t = 68F so T = 528R
#          c = 49*(528)^0.5 = 1126 fps


	The speed of sound in air is a const = 343 m/s, or 1114.75 ft/s at 20
degrees C.  The proper formula is v = (B/p)^1/2  where B=dP/dV/V and p is the
denisty of the medium.  This yields a v = 1500m/s or 4875 ft/s in water.  This
was derived using Young's Modulus...




	I own three rifles, an AR-15, Ruger mini 14, and Ruger 10/22.  I keep
these for target shooting, varmint plinking, and home defense.  I hope I never
have to use them for the latter, but I am prepared to do so if the need arrises
Not a nice thing to say, but its not such a nice world to live in.  

						-Dutch