[meteorite-list] Seems PF fell on 3/27 and NOT on 3/26...
From: Pekka Savolainen <pekka.savolainen_at_meteoritecentral.com>
Date: Thu Apr 22 10:22:34 2004 Message-ID: <3EE0C412.9090804_at_dlc.fi> --------------080907000905090306010707 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hello, Frank, Steve and the list; "Meteoroids of smaller intial mass lose all of their cosmic velocity while still several kilometers above the Earth. At this point the meteoroid´s fall path becomes quite steep since its forward momentum has ceased and the body falls by gravity alone, which is the terminal velocity of the meteoroid. It varies somewhat depending upon the shape of the of the falling meteoroid creating air resistance around it, but is typically between 125 meters (410.10 feet) and 250 meters (820.20 feet) / second, when it impacts." (Norton O.R. (2002) The Cambridge Encyclopedia of Meteorites, Cambridge University Press) take care, pekka MeteorHntr_at_aol.com wrote: > In a message dated 6/6/03 10:21:17 AM Central Daylight Time, > fprochas_at_premier1.net writes: > > >> Does anyone know of a >> measurement of terminal velocity from any fall, catching one on radar or >> something? > > > > Hello Frank and list, > > I have also heard the number "122 miles per hour" tossed around as the > speed. > > So would 122 miles x 5,280 ft/mile = 644,160 feet /hr. / 3,600 > seconds per hour = 178.93 feet per second. > > 12 miles up x 5,280 feet per mile = 63,360 feet / 178.93 = 354 seconds > = 5 minutes 54 seconds. > > Sounds a little closer. > > Now, did the fireball extinguish at 12 mile up, or possible higher or > lower? > > Steve Arnold -- Pekka Savolainen Jokiharjuntie 4 FIN-71330 Rasala FINLAND + 358 400 818 912 Group Home Page: http://www.smartgroups.com/groups/eurocoin Group Email Address: eurocoin_at_smartgroups.com --------------080907000905090306010707 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <html> <head> </head> <body> <br> Hello, Frank, Steve and the list;<br> <br> "Meteoroids of smaller intial mass lose all of their cosmic velocity while<br> still several kilometers above the Earth. At this point the meteoroid´s <br> fall path becomes quite steep since its forward momentum has ceased<br> and the body falls by gravity alone, which is the terminal velocity of the<br> meteoroid. It varies somewhat depending upon the shape of the of the<br> falling meteoroid creating air resistance around it, but is typically between<br> 125 meters (410.10 feet) and 250 meters (820.20 feet) / second, when it <br> impacts."<br> <br> (Norton O.R. (2002) The Cambridge Encyclopedia of Meteorites,<br> Cambridge University Press)<br> <br> take care,<br> <br> pekka<br> <br> <a class="moz-txt-link-abbreviated" href="mailto:MeteorHntr_at_aol.com">MeteorHntr@aol.com</a> wrote:<br> <blockquote type="cite" cite="mid:99.38b990e9.2c12169c_at_aol.com"><font face="arial,helvetica"><font size="2"> In a message dated 6/6/03 10:21:17 AM Central Daylight Time, <a class="moz-txt-link-abbreviated" href="mailto:fprochas_at_premier1.net">fprochas@premier1.net</a> writes: <br> <br> <br> <blockquote type="CITE" style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(0,0,255); margin-left: 5px; margin-right: 0px; padding-left: 5px; "> Does anyone know of a <br> measurement of terminal velocity from any fall, catching one on radar or <br> something? <br> </blockquote> <br> <br> Hello Frank and list, <br> <br> I have also heard the number "122 miles per hour" tossed around as the speed. <br> <br> So would 122 miles x 5,280 ft/mile = 644,160 feet /hr. / 3,600 seconds per hour = 178.93 feet per second. <br> <br> 12 miles up x 5,280 feet per mile = 63,360 feet / 178.93 = 354 seconds = 5 minutes 54 seconds. <br> <br> Sounds a little closer. <br> <br> Now, did the fireball extinguish at 12 mile up, or possible higher or lower? <br> <br> Steve Arnold</font></font></blockquote> <br> <pre class="moz-signature" cols="$mailwrapcol">-- Pekka Savolainen Jokiharjuntie 4 FIN-71330 Rasala FINLAND + 358 400 818 912 Group Home Page: <a class="moz-txt-link-freetext" href="http://www.smartgroups.com/groups/eurocoin">http://www.smartgroups.com/groups/eurocoin</a> Group Email Address: <a class="moz-txt-link-abbreviated" href="mailto:eurocoin_at_smartgroups.com">eurocoin@smartgroups.com</a> </pre> <br> </body> </html> --------------080907000905090306010707--Received on Fri 06 Jun 2003 12:40:50 PM PDT |
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