studiot

Hamilton's equations of Motion https://phys.libretexts.org/Bookshelves/Classical_Mechanics/Book%3A_Classical_Mechanics_(Tatum)/14%3A_Hamiltonian_Mechanics/14.03%3A_Hamilton's_Equations_of_Motion Lagrange's equations of Motion https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-61-aerospace-dynamics-spring-2003/lecture-notes/lecture7.pdf They are all equations of motion, realising that even a stationary state is a state of motion. I will leave the last word to Hamilton himself.

The Kelvin scale is based on the centigrade scale, but shifted by a fixed value as MigL notes. The original centigrade scale was based on having exactly 100 degrees between the two fixed points ie the boiling and melting point of water. There was also another water based scale due to Romer which is only of historical interest these days. However these temperatures depend slightly upon the conditions (pressure) adopted and more modern evaluations. The Celsius scale is based on the modern re-evaluation. Many constants in Science have varied slightly over the years as better measurements become available. There is an equivalent shifting for the Farenheit scale, due to Rankine. This is (still) used in engineering where it is then compatible with other old imeprial units. Both the Kelvin and Rankine scales It should be noted both the Kelvin and Rankine scales are 'absolute' not arbitrary like the others. This means that they are meant to start at 'absolute zero'. A final point is that the Farenheit scale has the advantage of water not freezing at zero so that most European temperatures will be positive.

Well , when I log on, I usually look at private messages before checking threads. So I replied to PM. I wasn't sure but I thought I would give the poste the benefit of the doubt. Then I went to the activity tab and immediately noticed the long list of recipients. Here is the test of my reply. I am posting this because I think the information might be useful to Alex and newboy Toby in another of their threads.

No not always. As swansont says, there was a time when enthusiatic amateurs, both men and women. But these were generally 'men or women of means' Count Rumford and Cavendish come to mind for the men Mary Ward and Marianne North for the women. Of course, some sciences are easier for the gifted amateur to discover something new in. Atom smashers are probably out of the reach, but mathematics probably has most and many amateurs have contributed. Ida Lovelace and Napoleon come to mind.

You haven't said if the information in each line is all one string or in columns or what ? In any case you need to start by telling us what you have done or think might be done. Hint : I would start with the last character in each line

Thank you. Here is an experiment. Take a large empty tin. Turn it over on the table so the bottom is uppermost. So it is like a drum. Hold your ear close to the bottom and tap the side. You will hear the sound from the tap for a long time after you have hit the tin. Now turn the tin the other way up so it is standing on its bottom. Tap the tin again and listen. You will hear the tap but the sound will die away very quickly. I need to know if you understand this.

Of course I can. But you did not reply to my last explanation or question. I need the replies to find the best way to answer and help you.

The Mills Observatory should be on anybody's list of visits if they are interested in night sky watching. It was built on a 'Law' (Old Scots for hill) in a region with lots of clear night sky views. Today the whole station is fully accessible and they do wonderful talks and presentations. https://en.wikipedia.org/wiki/Mills_Observatory

Count me in bro.

I think Mig's photo for the avatar was taken some decades ago. 🙂 Well to tell the truth, I only just made it into the 1950s. Unlike my elder brother who was a genuine child of WWII.

Last year, on a short psychology course I learned about another american Professor who gathered a group of students to pretend to have certain disorders and be subject to diagnosis by various NY clinics. The results of this were also quite startling.

Being kind, I am working on the "youngster who is working through a translator" theory. So 'No' was the sort of simplification one makes in such cases, at least at the outset.

I suspect many did not see your thread all those months ago. I confess I did not. I hope you are now ell again. Are you still interested in discussing that circuit or circuitry in general ? Before using a circuit simulator I would recommend finding out a little about circuit elements or components. By experiment with, did you mean witha actual components or on a simulator ?

But there is a perfectly good reason. Theism comes from the Greek theos (god) and refers to one or more gods who may or may not intervene in the universe. The direct opposite is atheism, evidenced by the addition of the negatory prefix 'a'. Deism on the other hand comes from the Latin deus (god) . So theism is the general term, which includes deism and other forms of belief. Note it is additionally confusing that the difference between Theist and Deist (ie the practitioners of these beliefs varies from the difference between theism and deism. Just like me then. +1 I'm a 'don't care'. It would make no material difference to my actions either way. Sometimes folks demand an either-or, black or white, binary answer to a question which is actually on a sliding scale of grey. But even this sliding scale is not always enough, as in this case and we need to strike out off the scale as I don't think there is a shade of grey for don't care'. Interestingly one of my neighbours says she converted to paganism during the covid lockdown. I am not sure what this means but she now has an illuminated christmas tree outside her front door all the time.

No Have you tried reading my post ?

Sounds a jolly good working hypothesis to me, considering how little information there is to work with. Thank you for this, I had not heard of the effect. +1

Thank you for the better English. There will be no resonance induced damage to to DVD's because they are just lying around. There may be objects in the room that could resonate but they will be like the bridge in Sensei's post. They will be suspended or strung up in some way. Consider this. A slack string will not pick up sound vibrations A stretched string can pick them up. (this is called resonance) You can hear this without damaging your ear.

Yes indeed. +1 J.

Thanks joigus, there used to be a T junction like that in Bristol at the end of the M32 which read "Inner Ring Road Left" and yes indeed "Inner Ring Road Right", at least the arrows were pointing the correct way. I've also seen an old fashioned finger post when cycling in the Cambridge countryside which had the same motif Cambridge and Cambridge. Anyway, when I took my driving test I thought this one meant Marilyn Monroe ahead.

I am not particularly interested in conspiracy theories, but I wonder if there is some sort of clique in Paris, dedicated to an anti-Einstein campaign ? One of the 'papers' offered seems to be from one Valentin Danci who has authored a fair number of anti-Einstein papers and hails from Paris. https://www.researchgate.net/profile/Valentin-Danci

Truly amazing, what will they think of to redefine next ? +1 I had not heard of 'topological solitons' , which are quite different phenomena from solitons. I se there is a Wiki article about them https://en.wikipedia.org/wiki/Topological_defect You will need to hope that someone else here has met them to discuss them as it will take me some time to catch up. But I will watch the development of this thread with interest. Thank you for introducing the subject.

Can travel ? Not sure you understand what a soliton is. They are are a particular phenomenon that can occur in travelling waves ie they are never still. I know that there are soliton models of photons (which are never still) in modern Optics. Hence my question. I recommend this book as an introduction

Lots of references here but there doesn't seem to be any particular issue to discuss. How for instance, can nuclei be represented by soliton models sinece solitons are moving objcts ?

Glad to hear you are still alive ! 🙂

Yes, it is not clear which frames you would be measuring time and distance in. You also need to be clear what the gain would be over other methods. Please think through your proposal since it is your thread. It is not, however, a silly idea since comparative measurments are very common in Science. So welcome, but remember you have a total of 5 posts available in your first 24 hours for anti spam reasons. 🙂