> . . . this includes 'spherical cow' type approximations . . . And that's why I like this list -- I learn new things all the time: <http://en.wikipedia.org/wiki/Spherical_cow>
Pat Lawler EMC Engineer SL Power Electronics Corp. [email protected] wrote on 12/10/2008 12:21:12 AM: > In message > <9d04b979323dcd428297dda95108893e0120c...@bb-corp-ex2.corp.cubic.cub>, > dated Tue, 9 Dec 2008, "Price, Edward" <[email protected]> writes: > > >If I lay a BNC or SMA cable (assuming 1/4" cross section by 10 foot > >exposure length) onto the working area (about 16' by 12'), the cable > >occupies only 30/27,468, or only about 0.11% of the floor area. > >The typical human feet cover 4" by 12" by 2, or 96 square inches. So > >there are 27,468/48, or 286, places where you can step in the room. > > > >You would think that the odds of stepping on the cable would be 285 to > >1. > You might, initially, but think about this. To make the math easier, > assume a square room and 289 footprints (17^2). So there are 24 > footprints along a diagonal. Lay a cable along that diagonal, and all 24 > footprints cover it, to a greater or lesser extent. Then there are 23 > new footprints along the other diagonal, then 15 new ones along each > side... So with 6 cables we have 107 footprints on them, out of 289. > Admittedly, this includes 'spherical cow' type approximations, but it > shows a trend. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > Either we are causing global warming, in which case we may be able to stop it, > or natural variation is causing it, and we probably can't stop it. You choose! > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. To post a message to the list, send your > e-mail to <[email protected]> > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that URL. > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
