studiot

The General Properties of Matter (1965 edition; 5th ed I think) Newman and Searle First published 1929

My apologies for misreading I though you meant PFA in the plural (there are many types). I was not aware of the direct use of these in concrete products, but to compensate here is a list of compounds used as plasticisers in building products. https://en.wikipedia.org/wiki/Plasticizer#Compounds_used_as_plasticizers

Yes you have the train of thought and the ideas correct. I am not sure about your mathematical developments though. I agree the referred article is tough mathematically, you might find this Newtonian treatment easier.

Since I can't find where you told us what the material was I can't really comment, but natural wood is stongly anisotropic in mechanical properties. I can't find any description of you intended use or method of application of your forces either. So please feel free to extend and develop your question, but also provide more detail so that we can best reply.

If you are considering the material incompressible, you should say so at the beginning. You might like to read this paper on the stress distributions in rotating spheres growing by accretion (ie planets) Note carefully that near the beginning the authors point out that the internal stress distribution is markedly different from a solid body that is made stress free in one go and then set rotating. The article give much useful data pertinent to bodies in our solar system. https://www.sciencedirect.com/science/article/pii/S0020768304006286

Forgive me but I am struggling with the idea of a sphere of uniform density that has internal pressure increasing radially inwards. Why will the density not increase radially inwards as well?

Hello Sloth, I missed this question when you first posted it, but I see you have been back since. So here is an answer, if you are still interested. Let us start by by noting that by asking about a sphere we are moving into 3 dimensions. A force is a uniaxial (one dimensional) entity. So the correct question would be is in terms of the stess (pressure) required to compress a sphere. The answer to that is yes if you use the correct linear-elastic modulus. This is called the bulk modulus and usually given the symbol K. [math]{\rm{Bulk Modulus = K = }}\frac{{{\rm{Volume stress}}}}{{{\rm{Volume strain}}}} = \frac{{{\rm{Pressure}}}}{{\frac{{\Delta V}}{V}}}[/math] The reciprocal of the bulk modulus is called the compressibility. This finds much use in the theory of sound. The bulk modulus is not directly measurable. The Bridgman indirect method may be used for some solids. However coming on to another point and addressing quiet's post. (+1 for progress encouragement) In three dimensions the components in each dimension are not necessarily independent and may interact. This is most studied in soil mechanics where uniaxial, biaxial and triaxial tests are made on soil and rock samples. Finally forces come in two types. Body forces eg gravity and contact forces eg via a compression test machine. Placing a sphere in a compression test machine will not (cannot) generate an even stress distribution. There will be very high stresses, known as Hertzian stresses, at the points (there must be two) of contact in a uniaxial test.

I can't see anything wrong with your post so perhaps whoever gave a red point slipped up. Here's +1 to reverse it anyway. BTW tunnel diodes have never really been eithe in fashion or out of fashion - I still have some in my spares box. But they are rather harder and more expensive to get hold of than some other components, and don't integrate well in large scale chips. Even ordinary diodes are often replaced by diode connected transistors on chips because the transistors are actually cheaped to produce on chip. The same goes for resistors on chips.

Domino computer ?? +1 Is that pizza base(d)?

Dutchman wins bookshop in raffle. https://www.bbc.co.uk/news/uk-wales-45450277

I agree with this since the whole question is badly posed and therefore futile. The short answer is no, since the title specifies all computers, although I suppose we could argue definitions of 'computers' and 'the fundamental components' till the cows come home. That is, of course without discourse on the subject of what is included as a 'transistor'. Even Strange's suggestion of restricting things to the current day will lead to the same answer since there are still purely mechanical (specialist) computers in use eg the antenna impedance calculators. http://www.rfcafe.com/references/electrical/cardboard-engineering-science-slide-rules.htm These are strictly speaking a form of analog computers. Another view is to consider the question "is it possible to build a digital computer (microprocessor) without using any transitors?" Again the answer is yes - although it would be very slow and cumbersome. All the registers in the processor could be replicated by sliding cards in and out of a window array. Thus all mcroprocessor instructions could be replicated and sequential does thereby executed. Finally, of course, the issue of the fundamental components. All the transistors in the world combined would be worthless without an output device. Imagine your smartphone with neither screen, microphone, speaker, nor internal antenna.

Radio four series in 5 episodes. http://www.bbc.co.uk/programmes/articles/4DByh8YQ757KDjWJTZjMPTq/how-to-have-a-constructive-argument https://www.bbc.co.uk/programmes/b0bfd2qr/episodes/player

It's also frustrating when you don't seem interested in discussion.

I would have to do some digging, but so far as known PFA confers additional protection against known concrete degradation processes eg ASR and Ettringite reactions. I seem to remember it also delays carbonation, but that would not be of such importance in foundations. But the significant use of PFA is on about 30 years old so we may have not yet hit any problem period that might yet occur. The research (on PFA) I did was largely concerned with strength issues.

I'm just a grunt I don't operate anything, but it's nice to know you appreciate my efforts on your behalf.

Before the great oil disaster wars of the late 20th/ early 21st centuries the principal exports (to us at any rate) of Iraq, Muscat and Oman was dates.

Does this help? How did you get on with your other projectile problem?

Of course it must be. If the sugar production kept up with the water intake the concentration would be identical. Do you consider the climate in Basra or Muscat to be mediterranean? Not that I would exclude mediterranean fruits.

Perhaps if you tried it my way you might find it more manageable.

So you checked by substituting into the equation(s) as Sensei suggests. Yes Strange takes the easy way, which funnily enough agrees with my quick method Add equation 3 to equation 1 3x + 2y +7z = 100 subtract 4x - 2y + 3z = 20 yields (eliminates y) 7x + 3z = 120 ........................4 Subtract 3* equation 1 from 2* equation 2 9x + 6y +21z = 300 42x + 6y -10z = 100 yields (eliminates y) thus I have two equations in x and z only. -33x + 31z = 200.................................5 Subtract 10 * equation 5 from 31*equation 4 217x + 310z = 3720 -330x + 310z = 2000 yields (eliminates z) 547x = 1720 (exactly) So x = 1720/547 (exactly) Which I make 3.1442 as a decimal to 4 decimal places.

I'm having trouble picturing this solid and tube? Do you mean single conductor? Perhaps a sketch?

Nothing to do with me but can you simply list what you think are the values for x, y and z?

This is an interesting comment can I amend it slightly from "higher water accumulation" to "higher rate of water accumulation". This would be consistent with the idea that sometimes the plant can accumulate water faster than it can produce sugar. Certainly planting in different soils is well known to have a major impact. When I moved from the chalk in the Thames basin to the marl in Devon I was suprised at the change in the taste of blackberries. This I have noticed continued consistently over many years. It is also true that there are fruits from each category which will not grow in the other, for example cloudberries. Yes I made no secret of my choice of inclusion in my categories, and tried to spell them out as well as I could. I point I meant to make about the sketch graph was that each grouping will have its own centroid and it is the position of that centroid, rather than the extremities which would be statistically significant. I would not accept that the range of fruits in temperate regions is less than in tropical, perhaps just so if the sub tropical is also included. But look at the map of how little (habitable) land there is between capricorn and cancer alone.

Let me say that your method of writing down all the equations and all the information or question marks as a list is a good one. But I don't know why you are using deltas for x and y but not for time. They are not needed. I am guessing that you have not done enough calculus to attack this problem that way? however the key to this is to realise that the horizontal acceleration is zero. Therefore the horizontal velocity is constant. You have this in one of your equations. Therefore when the ball is halfway in time it is also halfway in horizontal distance and vice versa. Can you use this observation to make progress? You will need to work several of your equations together to get the desired formula. I suggest you rewrite your equations (without the deltas) as equations of the form t = and compare them at known points in the horizontal and vertical paths.

The difference between that which was written in Alexandria and that which was written in Jerusalem? There two (different) versions of quite a few events in the Old Testament due to this effect I understand.