studiot

Your original question implied to me at any rate larger objects than 'point object', which can be truly modelled by single events. When you consider objects made up of some/many event points you can run into simultaneity issues. I think this is what Markus was referring to, but I should wait for his and swansont's comments as well.

+1 for having a go, but realising the safety implications of higher voltages. A few points about you results. You are calculating resistance, whereas it is more usual to use conductance with liquids. Yes this is just the reciprocal of resistance but standard tables of values are all in conductances or conductivities. Do you understand the correspondence between resistance and resistivity v conductance and conductivity ? Also you have not put units to you 'resistances' I have multiplied my conductances in this graph by 10,000. By the way Desmos.com/calculator is a useful free simple online graphing tool. Looking at my graph which has only plotted the points, you are not justified in drawing the two straight lines as you have wiht only 4 points. The graph 'turns over' to become asymptotic to somewhere around 4.5 conductance units. Two other notes about your setup. Yes there is an ohmic aspect to conductivity of water. As the voltage and therefore the current rises some ohmic heating will inevitably occur raising the water temperature. This is the basis for certain types of water heater. The conductivity or resistivity of water, both pure and contianing impurities (eg tap water) is quite heavily temperature dependent.

+1 And a single point in space, ie a single point in spacetime. So it is not just not a car crash it is also not a car.

The Romans built hundreds of miles of canals and aqueducts in the country that gave birth to modern California.

As I have already mentioned, how ironic is that ? Who would be the greater threat to our society Comrade Putin or Comrade Scargill MK2 ?

Thank you for your clarification. +1 Of course you have plenty of higher ground in America. How much do you think the Dutch have ? I take your point about the headlong rush for progress in America, youngsters were ever that way inclined. This Mississippi system (we used to have spelling contests at primary school as to who could spell 'Mississippi' backwards the fastest) includes some of the longest waterways in the world and the Midwest has plenty of potential space to hold back water for dry years and save the stretch from St Louis to New Orleans from repeat serious flooding. The river in my local town empties into the channel with the second highest tide in the world. Historically when there is a combination of spring high tides, adverse westerly winds and additional rainfall in the catchment area there have been floods in the town centre. The new country park provides enough low lying holding area and a brand new parkland, unusual in the 20th century, for the forseeable future protection needs. It can be done, it has been done, economically and beneficially. It just requires the political will.

No But they may look different to an observer in a different frame.

We in the UK are still suffering the effects of the extreme right wing rubbish that caused the low level civil war between two sections of our public sector in the 1970s/ 1980s. This has seriously adverse effects to this day in a way that America and Poland are not suffering.

Last time the Indus delta flooded the guardian wrote

You know this as an Engineer I suppose ? Have you tried discussing this with a dutchman ? Definitely my point about Yeomans, the Harappans and the beavers.

You definitely researched and thought before replying. +1

On tonight's news it was reported that low lying Sindh province in the Indus delta has received 8 times its annual average rainfall during July2022 to August 2022. That doesn't sound like tree chopping in the Himalaya to me. You proposed it as a single point solution. I have accepted that there will be a measure of this solution. And yes I was exaggerating for effect, just as you did.

So is imflammatory wording like this. No one is being 'blackmailed' . Look up the definition of the word and explain what hidden fault of the public or society they are afraid of being exposed for.

I don't know, I'm just following your logic to its conclusion. It's not as simple as you make out. Yes, I suspect some migration is inevitable. But equally overcrowding in other areas of plentiful to too much water has led to trajedy as todays floods in Pakistan demonstrate.

That would seem to be at variance with the history I grew up with. The experiments that led to the expanding universe predated the 'steady state theory' So any proposal of steady state had to account for the lack of mass density change.

So why did Bondi and Hoyle propose 'continuous creation', if not because the universe was known to be expanding ? Surely that would lead to a steadily increasing mass density, which equally surely can't be called 'steady state' ?

So should we all move to Antarctica or Greenland ?

Everything we do rests on things people before us did. For instance if someone had not already 'invented' calculations of what use would a calculation engine be ? I would imagine that the abacus was known to Babbage, but so what ? and Why would his knowledge of that be suprising ? He would probably also know that surveyors of his time measured by a physical chain. Each time it was laid along its length the survey would pick up a small stone and put it into his pocket. At the end of the survey he could then count how mainy chains he had measured. So a pocket full of stones is a sort of calculation device. In fact it is a sort of primitive memory.

Thank you. I haven't kept up with cosmology, standard or otherwise, for many years, decades even, as theories seem to change almost as frequently as I change my socks. I had understood that the original reason for (now discredited) ' the continuous creation of steady state theory' because the mass density did not appear to be going down, despite inflation.

Yes, if it worked. Here is a simple (and very cheap) experiment to test it. Even in the UK we have rivers where there are weirs with substantial falls. Nothing like the Victoria or Niagara falls but enough for must test experiment. Where there is a reasonable flow of water tumbling down a few tens of feet there is usually to be found a substantial fine upward rebound spray zone. So take a humidity meter and measure how quickly the humidity drops off to ambient away from this zone. This would provide a crude assessment of how much and how far the 'climate' is affected by such a spray zone. River gauging information would give an idea of how much water you would need to pump.

The probability that the electron (or any quantum particle) exists at a specific point on a space axis is exactly zero. Yet all those zero probabilities can be summed to exactly 1 over the entire space axis. There are many counter intuitive results in Maths like this.

This must be a record, I have agreed with John Cuthber 5 times in a row. +1 for that post. Almost every time we have well publicised strikes the tired old argument about the nature of "the strike weapon", imflamatory language in my opinion is repeated ad nauseum. If employers say " the cost of raw materials, rent, utilities etc is going up so this must reflect in higher prices in the shops". Why can employees not say "the cost of rent, utilities, food etc is going up so this must be reflected in a higher cost of labour" ?

In fairness I don't think conventional mass density 'dilutes' with expansion either, but please correct me if I am wrong about that, I am not a cosmologist. However +1 for the calculations first half of your post.

Perhaps our north american members might remember this short story I read in Analog or Gollanz around 1966. Can't find it even on this site https://sf-encyclopedia.com/entry/black_holes But the story was about three voyagers who literally fell into a black hole in their spaceship and their respective viewpoints. One voyager was an altered human, one was an AI robot of some sort. I will post more if I remember the name of the story.

Professor ? Thawne Tachyons and TNT, an unusual scattergun combination of questions. Did anyone say this is dangerous ? Here is an old picture from ICI to demonstrate this Have a nice day.