studiot

Like Hydroelectricity.

That would break the zeroth law of thermodynamics.

To answer this you need to understand what is meant by the word 'fall'. Falling, of course, refers to motion, specifically its acceleration and velocity. Now velocity is the rate of change of distance (position) with respect time. And acceleration is the rate of change of velocity with respect time. As such their units are LT-1 and LT-2 respectively. So it can be seen that these quantities only depend upon length and time and are independent of mass. As a matter of interest, falling on Earth does depend upon position or location. Two objects at the same location will be subject to the same acceleration and therefore fall at the same rate. However if those two object are located at the Pole and the Equator respectively they will fall at different rates because the acceleration they experience is not due to gravity alone but is a compound of gravity and centripetal acceleration. So in this case a body's motion at right angles to the direction in which it falls affects its rate of falling.

Actually not necessarily. You can create a thermal drift current yet the voltage and impedance can both be zero. Can we please get back on topic now.

Hey Butch it's that calculus fish. It bit ya again. You are probably (ha ha) thinking of the following The probability of finding the electron between x and (x+dx) is f(x) as we let dx tend to zero (ie take a limit). That is the way this sort of probability is calculated.

Yes a male to male connection cable from the female wall socket to the female TV socket would be the norm. However if the aerial is not connected to a wall socket but is portable it would likely have a connection cable, hardwired at the aerial and terminated in a male plug at the free end. If this cable was not long enough you would need an extension cable with a male one end and a female on the other. But what if it is still not long enough? Then you could interpose a cable with a female plug on each end. This is an alternative to a 'barrel connector' with a double female and a male to male cable. La plus ca change la plus c'est le meme chose.

First some terminology As far as I can tell, the cable picture I posted has a plug on each end. One plug is male the other female. The cable has no sockets. Yes this makes it an extension cable because, when connected at one end, it can reproduce the connection conditions at the other. That is it has the same gender of connecter at its free end as the connector it mated with at the other end. So it has opposite genders at each end of the cable. That is the condition for an extension cable, it can extend and existing connection cable by reproducing either connection gender at the extended end. This opposite gender requirement is duplicated in other xtension cbales such as a mains extension cable, a USB extension cable and so on. Note I also said connection cable. A connection cable is either fixed to something at one end or carries the same gender connector at both ends. A simple example would be an audio connection cable with a male jack plug at each end. We could extend this by using an audio extension cable with a male jack plug at one end and a female jack plug at the other. Now I have said they are both plugs. That is because we need additional terminology to define the connection conditions. This is where the difference between plug and socket comes in. A socket is fixed by being mounted in some way. A plug is free on the 'waggly' end of the cable and designed to be 'plugged into' a fixed socket. Both the socket and the plug can come in either gender (male or female) varieties. If you look in electrical trade catalogues you will see this is how the items are described. There is some blurring of the distinction (isn't there always?). For instance whilst a mains extension lead might have a definite socket mounted on a cable reel, it might have what is called a 'trailing socket' instead. As to my original post I have been doing some more research. It was suggested that overheating during soldering might have expanded the one type of plug pin, which remaind stretched after cooling. I will report back on this theory when I have more information.

I'm sorry to say that neither the wider physics community nor I interpret Einstein's writing in such a narrow way. You are sadly missing both my and his major and most important points about his breakthrough.

Why on earth would anyone want to go to such ridiculous measures to generate electricity, when there are far simpler easier, cheaper and safer ones that the politicians won't let us use now? And by the way what is a "fusion laser" ?

Yes this is true for hypersurface dimensions greater than 2. A surface divides 3 dimensional space into two disjoint parts. That is you cannot get from one part to the other without crossing the surface. A one dimensional object (manifold or line) cannot divide 3 dimensional space in this way. A hypersurface divides n+1 space into two parts with similar restrictions. An n-1 dimensional manifold cannot divide n+1 space in this way. Further a surface has two sides. Some objects have only one side such as Mobius strip.

It's not clear to me what you mean by this. You can't just move the double bonds without also moving the single bonds. Look at my diagrams. If we start with a standard representation of the first double bond on AB and follow round we get figure 1 Note that every carbon is attached to a single hydrogen. If we move every bond round the ring one place so the double bond AB moves to BC and the single bond BC moves to CD etc we get fig 2. If instead we swop AB with AF and CD with DE we move the single bonds the other way we will have all the double bonds on one side and all the single bonds on the other, as in figure 3. However will also have to move some of the hydrogens, though we will still have the right number of bonds for C6H6, two of the carbons 2 hydrogens and 2 will have one apiece. So tell us what you mean so that your question can be properly answered.

A surface is always two dimensional. It can exist (be embedded in) 3D, 4D, any number of D, but the surface itself is always 2D.

Isn't that how chinese whispers got started?

Sure let the Man speak. So on page 8 of the document you link to he says So what is this a statement of if not to say that the c is independent of the observer? It may be that Einstein's original words said this in a roundabout way (I have not read the document you refer to before) and that attributing this to the observer is a modern distillation. So thank you for providing the link where I could get the pdf. The only document of his I have is the Lawson translation English translation of his Princeton book 'Relativity' 1957 version (original English translation 1920) Where he follows much the same path. You haven't addressed my question why would he not address observers in some way since it was already known that the velocity of waves were independent of the emitters and this was published before the quantum duality was proposed, so the prevailing theory of light was still Young's wave theory.

Okay, definition, description, explanation of scope ....... What's in a word?

Not sure how this is a response to my post, but I note I omitted the reference to the Nippon steel report. Sorry about that. http://www.nssmc.com/en/tech/report/nsc/pdf/6215.pdf One materials science point is that most steels have a fatigue life long enough to be considered indefinite. Alloying additions to iron need to be chosen to avoid changing this and a modest % titanium achieves this requirement. This is quite unlike most aluminium alloys, a point driven home by the Comet 4 disasters. The equally disastrous failure of the Liberty ships was induced by fast fracture in the welds, not the primary steel. As a matter of interest some of my more interesting recent work (just before retirement) was gas flow design for welded stainless steel and titanium pipework associated with aero engines.

This cannot be answered without more information. The size and shape of the reaction vessel is required as well as the mixture volume. What is Po? What is an emean value?

Do you not find arguing over a definition like "the definition of Philosophy is...." pointless? Often as soon as a third person enters the discussion yet another definition is broached. The twentieth century has seen the development of the solution to this. Before one uses a term it is good practice to state the 'definition' you will be using and preferably the conditions for which it holds true.

If you would like to go back and read all of what I said you would surely see that I was commenting upon an statement by phyti concerning the substance of Einstein's second postulate. I cannot imagine that Einstein would postulate something that was already known. Report post Posted Friday at 07:08 PM Studiot Are you sure? I thought the innovation was that the speed of light was the same for all observers. This is what distinguishes it from previous knowledge since in classical wave theory the wave speed depends upon the medium and is independent of the emitter. For example a jet fighter emits sound, but it does not matter whether the jet is travelling subsonically or supersonically, it makes no difference to the speed of sound in the air. A moving observer will observe a different speed for the sound. The breakthrough postulation was that this is not the case with light, but that any observer, moving or not, would observe the same speed for light.

What does that have to do with my comment on your post?

The main benefit that titanium brings is its increased fracture toughness. Hard steel alloys mostly have low fracture toughness compared to more ductile steels. Some are reduced to similar values to the aluminium in coke can. There are other cheaper alloying elements, chromium, nickel and vanadium, that also confer a measure of stainless corrosion resistance. I am not sure of the corrosion resistance conferred by titanium.

Perhaps the broadcast standards and practices are different from the UK where you live? But thank you for trying to help.

I really don't see what this has to do with my question. Yes the TV will receive and decode satellite or cable, but no, thankfully, I don't need that clumsy and cumbersome dish since the TB signal is fine from the aerial in my loft. There is nothing obsolete about my Yagi. Of course cable is not free.

I am sorry I really don't know what you mean. HDMI is a video/audio/control standard that is much lower frequency and quite different from (and unsuitable for) the terrestrial digital television broadcast signals. The system is now working perfectly in full HD mode since I have fitted modern B-L connectors. I haven't seen any 4k mode since there are no transmissions of 4k in the UK and the BBC "has no plans to broadcast any".

Sure I can dredge my memory to try and find out what I was thinking of. Chemtube is a free university website where you can play with animations of molecules. It's also easy to use but requires javascript. http://www.chemtube3d.com/spectrovibcd1-CE-final.html#models I don't know how to embed the carbon dioxide animation here so thanks if anyone can achieve that. If you watch the carbon moving about between the two oxygens you can see the bonds lengthening and shortening and waving about. This means that the charges are moving relative to one and other. In other words charge is being displaced. But movement of charge is another word for electric current. It was called displacement current because the charges don't flow on and on like a river, but simply change the position in space. The original definition of displacement current was about capacitance (as I have already mentioned in this thread) and referred to how a 'current' can pass through the space between the plates of a capacitor. It may occur only once or it may happen periodically. I also said backalong in this thread that the molecules respond to the electric component of the radiation, rather like a radio antenna albeit capacitively not conductively. Would you like to explore this further and have you any arising questions so far?