From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,c6c96fe0302f04f X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-08-27 12:24:24 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!arclight.uoregon.edu!wn4feed!worldnet.att.net!bgtnsc04-news.ops.worldnet.att.net.POSTED!not-for-mail Message-ID: <3D6BD1A8.9060801@worldnet.att.net> From: Jim Rogers User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.4) Gecko/20011128 Netscape6/6.2.1 X-Accept-Language: en-us MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: POLL: Would you use Ada more if... References: <3d5cfe91.17985251@news.demon.co.uk> <2a038d0e.0208271023.6b0fc44e@posting.google.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 27 Aug 2002 19:24:24 GMT NNTP-Posting-Host: 12.86.36.142 X-Complaints-To: abuse@worldnet.att.net X-Trace: bgtnsc04-news.ops.worldnet.att.net 1030476264 12.86.36.142 (Tue, 27 Aug 2002 19:24:24 GMT) NNTP-Posting-Date: Tue, 27 Aug 2002 19:24:24 GMT Organization: AT&T Worldnet Xref: archiver1.google.com comp.lang.ada:28456 Date: 2002-08-27T19:24:24+00:00 List-Id: Anatoly Chernyshev wrote: > Dmitry A.Kazakov wrote in message news:... > >>Robert A Duff wrote: >> >> >>>That reminds me of a talk I heard some years ago, given by a guy from >>>NASA. He was talking about the software for the Apollo program. They >>>had weight budgets for all the pieces of the rocket -- obviously you >>>want to make the thing as light as possible if you're launching it into >>>space. So the manager asked the software guy how much the software >>>would weigh. He said software doesn't weigh anything. The manager said >>>come on, these weight budgets are very important, even if it's not much, >>>every ounce counts. The software guy tried in vain to convince the >>>manager that the weight of software really is zero. Eventually the >>>software guy showed the manager a deck of punch cards, and said, See the >>>holes? That's the software. Then the manager understood. >>> >>(:-)) >> >>[OT] I have almost forgot physics, but I suppose that the weights of >>RAM/ROM bits set to 0 and 1 should slightly differ. So same CPU may weigh a >>pair picogramms (?) more or less depending on the software version. >> > > From the Brillouin's theorem: > Increase in information is equal to the decrease in entropy: > > dI = -dS > > As soon as dS is in J/(mole*K), the intrinsic energetic part of S > depends on the fraction of the matter by which 1 bit is coded, and, of > course, on the temperature too. > If the bit is coded by, let's say, the spin state of single electron > then mole fraction is equal to 1/NA (Avogadro's number = 6.02e23) = > 1.66E-24 moles > Another example, when the bit is coded by an abacus stone maden of > quartz, then molar fraction is going to be mass of the stone (take it > for 5g)/molar mass of quartz (60) = 8.00E-02 moles > > The difference in energy for 0 and 1 states for these devices at > 298 K (1*mole*T) will be respectively 4.95E-22 J and 2.38E+01 J. > From E=mc**2 we now obtain the mass difference between 0 and 1 bits > for these cases: 5.50E-39 kg and 2.65E-16 kg. > If the length of program is 1Mb which is 8388608 bits (we do not > consider the domination of 1 states over 0 states because they do not > complement each other, since one has to always spent some energy to > keep both states ordered) then the mass difference between bulk > support (CD, abacus, etc) will be 4.61E-32 kg in the first case or > 2.22E-09 kg in the second case (if one was dare enough to code 1Mb > program in abacus). > > This is just an estimation made for fun, so I may be totally wrong. This analysis relies upon a misunderstanding of the formula E=mc**2. Not all energy transmission results in the formation or destruction of matter. This only happens during fusion or fission. If this were not so, your calculations would still be incomplete. You ignore state transition energies, friction, differences in gravitational forces, and perturbations of nearby electric and magnetic fields. These other forces result in additional energy consumption resulting in a local increase in heat. Jim Rogers