From nobody@digitalkingdom.org Thu Dec 10 21:54:05 2009 Received: with ECARTIS (v1.0.0; list lojban-beginners); Thu, 10 Dec 2009 21:54:05 -0800 (PST) Received: from nobody by chain.digitalkingdom.org with local (Exim 4.69) (envelope-from ) id 1NIyS4-0002HG-Ss for lojban-beginners-real@lojban.org; Thu, 10 Dec 2009 21:54:04 -0800 Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120]) by chain.digitalkingdom.org with esmtp (Exim 4.69) (envelope-from ) id 1NIyRy-0002Ca-0r for lojban-beginners@lojban.org; Thu, 10 Dec 2009 21:54:03 -0800 X-Authority-Analysis: v=1.0 c=1 a=JHTZ5qfUcacA:10 a=D--OPeiRnbMrElQw9TMA:9 a=JCuBV9uy0Z-JbBH0DjcuccIPu8gA:4 a=zkmb3IGoy-cg83SS:21 a=z9attkFuOFcQRtKL:21 X-Cloudmark-Score: 0 X-Originating-IP: 71.75.215.96 Received: from [71.75.215.96] ([71.75.215.96:61717] helo=chausie) by cdptpa-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 76/53-01567-E6ED12B4; Fri, 11 Dec 2009 05:53:51 +0000 Received: from localhost (localhost [127.0.0.1]) by chausie (Postfix) with ESMTP id 1B8243307 for ; Fri, 11 Dec 2009 00:53:50 -0500 (EST) From: Pierre Abbat To: lojban-beginners@lojban.org Subject: [lojban-beginners] Re: On units and mekso Date: Fri, 11 Dec 2009 00:53:45 -0500 User-Agent: KMail/1.9.6 (enterprise 0.20070907.709405) References: <429fde40912101249s24079419g2804c566b311b2a2@mail.gmail.com> <925d17560912101728q10ed995fg2202bfc242e14b0c@mail.gmail.com> <85c354a20912102040tf3f384asdb76305237a57199@mail.gmail.com> In-Reply-To: <85c354a20912102040tf3f384asdb76305237a57199@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200912110053.46929.phma@phma.optus.nu> X-archive-position: 2642 X-ecartis-version: Ecartis v1.0.0 Sender: lojban-beginners-bounce@lojban.org Errors-to: lojban-beginners-bounce@lojban.org X-original-sender: phma@phma.optus.nu Precedence: bulk Reply-to: lojban-beginners@lojban.org X-list: lojban-beginners On Thursday 10 December 2009 23:40:52 Ross Ogilvie wrote: > Angular acceleration is in units of inverse square seconds (because radians > are dimensionless). > > e.g. imagine a 3 kg mass on the end of a 5 metre arm, which has an angular > acceleration of 0.5 inverse square seconds. The linear force is then 7.5 > Newtons. Then there's the second moment of area, a quantity used in the design of beams and trusses. Typical values for beams are on the order of a million quartic millimeters or a millionth of a quartic meter. I think that unit should have a special name, even though only civil and structural engineers would use it. I've seen a calculation which resulted in a fifth power of a length, but it was only an intermediate result. Pierre -- li ze te'a ci vu'u ci bi'e te'a mu du li ci su'i ze te'a mu bi'e vu'u ci