studiot

Thanks +1

Thank you for asking what I meant rather than just taking an opposite view. +1 Is the solution of hydrogen flouride or sodium hydroxide not exothermic ? Thank you for the clarification. I think the comments here show the value of a well posed question as opposed to a vague one, with respect, like yours. Ok you have mentioned water. So there are many types of bonds. Some types of bonds have a very specific 'bond' energy. Other types have a range of energies and a statistical average. Water is subject to both of these types. The intra molecular bonds exchemist refers to are of the fixed or specific type. But the bonds which hold solid water together are of the statistical type. So it is conceivable to create the bonds on the low side of the statistical average and replace them with new hydrogen bonds on the high side of the statistical average bond energy. And of course vice versa. Of course this process cannot be continued indefinitely on account of conservation of energy.

Not necessarily because life if more complicated than you present. Some bonds release energy when they break. These are called exoergic (also exothermic but that is strictly heat is released. The reason they don't immediately break up by themelves and release energy is something called activation energy. How far do you want to go with this topic ?

I don't agree with this statement, in thecontext of this question. Have you ever wondered why the OP has not come back to discuss it further, although he has been here since he posted it ? I do also wonder if there was not a mistake on the whiteboard (or copying from it) and that the Pex under the integral sign should be just P or that there was a carry over from a previous whiteboard we haven't seen ?

Wasn't the big thing about Yeomans was that he was trying to think of and use the positives, rather than moaning about the negatives ?

Is this homework, Looks like it to me ? I'm suprised you haven't started off with a few ideas of your own. As regards gravity I have in mind a gravity dam, with an installed hydro electric generation scheme. The first is a use of gravity that is the exact opposite of mathematics offering. The second is a direct use of his offering. So it would be courteous to thank members for their contributions. Further I suggest you list out the definitions of the four forces and see if that suggests anything to you. Here is a starter The weak force cause radioactive decay. What medical uses does this suggest to you ?

It would be more helpful if you actually answered my question. Scientific order and scientific chaos are not opposites but have a very tenuous relationship. Chaos Note the word apparent. Order is more difficult. There are a great many mathematical uses of the word order, but none of them mean colloquially 'like a bunch of soldiers on parade' which would be a popular misconception. There is a process in statistics where you select one state and call it 'order or the ordered state'. Then all other states are 'disorder' note not chaos. You can then use probability theory to determine useful things about the relative probabilities of each state.

Repetition is not explanation. Also if you want this to be a discussion of theoretical and modern physics then you need to use specialist terms correctly. We can and will help you with this, which is why I asked about your understanding. Suggestions on the other hand belong in speculations. A note: a new member is allowed 5 posts in their first 24 hours as an (effective) anti spam measure. Please don't waste them arguing minutiae, this could be an interesting discussion.

Does this thread have a pont we can discuss ? Perhaps you should explain what you think the terms 'chaos theory' and 'orde'r are please ?

Thank you for the Australian viewpoint. Have you come across P A Yeomans and his keyline proposals and can you shed any light on how they are making out today ? I have recently been told they are still going strong. P A Yeomans Water For every Farm.

I saw no mention of a burst tyre in the OP. We don't know that heat is not being considered or other matters on other screens/snapshots of the lecturer's presentation. In any case you have to calculate the heat and work terms separately. We don't know if Ideal or other gas laws are being invoked. In fact we don't know much about the problem at all.

Whilst I'm all for experiments, I seuggest yoy would be better off reading this book first. Particularly the chapters on Foucault and other pendulums, atomic clocks and most important sunchronisation of a chain of clocks. A brief History of Timekeeping. Chas Orzel 2021 / 2022

Not sure I understand the meaning of 'fluid pressure acting on itself' ? We don't actually know much about the way this student is being taught. The one liner statement isn't sufficient to go on. There is, for instance no mention of a piston or description of what the diagram represents or where it comes from. Also sometimes students miscopy what is written or mishear what is said, but are intelligent enough to realise later that something is amiss with their notes. I have already noted my guessed interpretation. If the diagram represents the expansion of a fluid into the atmosphere, from a small volume at high pressure (points 1 on the diagram) to a larger volume and lower pressure (points 2 on the diagram) and this lower pressure is the expansion into the atmosphere this process is irreversible. The work done is the work done against the constant atmospheric pressure, represented by the blue horizontal line and the volume change, delta V is the difference between the volumes at point 1 and point 2 on the diagram. This product PdeltaV is correctly shown by the blue hatched rectangle.

Thanks for coming back to us to report. +1 You first posted this question in spring, ie at the end of winter. It is not uncommon for a failing battery to 'recover' during the summer months and fail again the following winter. So if your tests revealed an elderly and failing battery you have the rest of the summer to get it sorted.

Yes I understand that, but I am asking why is that important ? Did you catch my comment/question about the importance of Pluto's very tenuous atmosphere ? It is really only very simple arithmetic to derive the end formula which is vry simple and all that matters. Skip to the end and let swansont or joigus or janus dissect it, as I'm sure they will. I will try to plot a suitable graph of the result, that may help visualisation. I should also point out that some planets are spinning faster than others and the rotation makes a measurable difference to the apparent gravity. My calculations assumed a non rotating planet.

I think all this consideration is small compared to the fact that different parts of the Earth are rotating at different (angular) speeds and possibly in different directions.

On first reading I thought only mass was involved, but on more carefull reading I see that you have incorporated density difference. I have now had the time to sketch out some maths.

Of course you can, the number is still on my website. However the last time I fixed Jesus' computer it was for eternity, so I would know immediately that the call was a scam. An fraud that has been going around quite some years runs like this, though there are several variations. A uniformed person or pair turn up at the front door of proababklly an elderly slightly confused person and claim that they are police officers who are tracking criminals who have hacked your bank account. Sometimes they can persuade the person to go to their bank and withdraw a large sum to place with the police as bait so they can catch the alleged criminals. Of course they simply make off with the cash in the "unmarked police car" and are never seen again. I have an elderly relative who fell for this one to the tune of £10,000 The problem then is that the politician, large or small, has someone else to blame when thing go wrong, but want all the credit when they go right. But even the bureaucrats play this game. UK ministries are forever employing 'arms length contractors' for this purpose.

With equal respect, it is quite a different issue from , as stated, a different article the previous week. But the issue that those who wish to be or become leaders must face is that they have to deal with all the issues that arise, not just some of them. And that is the point of this thread, references to news articles are just examples of the manyfold issue currently arising in the last couple of week. There is another one today about a serious case of hacking into the NHS.

Seems like small potatoes compared to the mass of eroded material brought down from the mountains by water or just gravity to me. I haven't measured it but not only is the mass small but the average leaf fall from trees is about 30m whereas rivers of say the Himalya drop severalthousand metres.

Weight loss ? Three phase? They must have been of the 5 - 2 diet And 5minus 2 is well three of course.

I note that swansont's press release refers to milliseconds of variation. Set that against the addition of leap seconds (last one in 2016, two in 1972) to the clocks to balance out variations in the rotation speed.

Thank you for your thoughts. I see you have nearly as low an opinion of top politicians as I have. +1 Not all the scams are computer fraud however, although last week we were treated to an extensive scam involving b__king.com. People were turning up at folks doorsteps saying "We have arrived for our booking in your property" Some property owners from London who were interviewed said that sometimes 3 or more separate parties turned up per day. Some of the scammed visitors came from Hong Kong, Australia, New York and so on and were left accomodationless and holidayless in the middle of London as the owner had never had anything to do with b__k.com or intended to let out their home. This continued in some cases for months after the scam was reported. So please don't plead the victimless crime argument.

Hi, Moon. I'm not sure why you homed in on the 'extensiveness' of the atmosphere ? As Janus points out there are many variables involved and it should be borne in mind that the importance of a planet's atmosphere does not depend upon its extensiveness. A fine example of that is the discoveries made by the New Horizons team in respect of Pluto, whose atmosphere was regarded as 'thin to non existent' before the spacecraft flew by. Now we know the profound effect this thin to non existent atmosphere has on that planet's geohistory.

Yes I think that's a good way to put it. +1 But wider still, not only can theory A be based on theory B but also theories C, D, E.... and still not the other way round. Thanks for that insight.