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("Trash" found on a hiking trail frequented by mountain bikes.) Re: #9 electron behavior similar to the precession of Mercury. Date: 1998/12/30
In article <3689656F.58DA@earthlink.net> Uncle Al <uncleal0@earthlink.net> writes:
> Archimedes Plutonium wrote: > > > > Is there any electron behavior known that is similar to the precession > > of perihelion of Mercury? > > Lest anybody doubt the difference between ignorance and stupidity...
Typical uncle al help. As far as I'm concerned AP asks a very good question which al only has time to criticize.
I will think about your question more but in the mean time the following is from Marion "Classical Dynamics" 1st edition page 290:
"... Newton who pointed out that any advance or regression of a planet's perihelion would require the radial dependence of the force law to be slightly different from 1/r^2 ...
In point of fact, for planetary motion within the solar system, one expects that, due to the perturbations introduced by the existence of all of the other planets, the force experienced by any planet does not vary exactly as 1/r^2... Detailed calculations of the influence of the other planets on the motion of Mercury predict that the rate of advance of the perihelion should be approximately 531 sec of arc per century."
Have a Happy New Year AP!
Link to thread of next article. Interesting picture of a nuclear fireball, oct 87 National Geographic. Date: 1999/01/14 Link to that interesting picture. On page 472 is a picture of a nuclear fireball. The fireball is maybe 200-300 feet in diameter and does not completely engulf the tower that held the bomb. The fireball is a roughly symmetrical ball. However this rough symmetry is broken by a series of fireball spikes (cones) in the lower half of the fireball, with the following spherical coordinates (theta = 0 is up, the spikes point towards the ground):
Four large spikes (cones) (about 1/3 the radius of the fireball in length ) at approximately (theta, phi) =
Four smaller pairs of spikes (about 1/10 the radius of the fireball in length) at approximately (theta, phi) =
The spikes clearly appear only on the lower half of the fireball and have a four fold symmetry about the vertical axis.
Are the spikes from the geometry of the bomb or are they from interactions of the bomb blast with the bomb tower?
Link to thread of next article. An accelerating ruler, which end goes further? Date: 1999/01/14
There was a thought provoking graphic on page 433 in the paper:
"Rigidly connected accelerated clocks", by Carlo Giannoni and Oyvind Gron in Am. J. Phys. 47(5), may 1979
A 1 meter ruler starts out at rest, accelerates for a time and then moves with constant velocity. When the ruler moves at constant velocity it is measured and found to be less then 1 meter long. Plot the ends of the ruler in the rest frame as a function of rest frame time. These two curves are not the same.
One end is measured to move more then the other, give a hand waving argument explaining which end moves more.
Link to thread of next article. Would this in work determining the C.G. of an aircraft? Date: 1999/01/19
If you knew the pressure of the gas (or liquid) in the landing gear struts of a typical large aircraft, the area of those strut pistons, the distances of the landing gear for and aft C.G., and other stuff I'm forgetting would that allow one to determine the C.G. of the aircraft even if only approximately? If so has it ever been checked this way. I know(?) that normally determining the C.G. one must take into account many items and their locations and there is much room for error. I can picture a heavily loaded C-130 taking off and after takeoff the pilot screaming like mad "Move that tank forward 10 feet!!!"?
Relativistic appearance of a spinning bicycle wheel. Date: 1999/01/16
I spin a bicycle wheel. You rush past such that your velocity vector is perpendicular to the wheels spin vector. Will the bicycle spokes make straight lines in your frame? If I'm right, only the spokes momentarily perpendicular to your velocity vector will appear straight?
Link to thread of next article. Fixing small cuts and finger nails with Krazy Glue? Date: 1999/01/10
For the past year I have used Krazy Glue (and Super Glue) to repair myself when I get various breaks in my skin and also on split finger nails. I have found the Super Glue to be so useful that I wonder if there is something available at the local drug store that works in a similar manner as Krazy Glue but is safe for skin (Krazy Glue warns against getting on your skin)?
Let me describe several ways in which Krazy Glue has helped me get myself back together.
1) Some small cuts on one's hand can be troublesome in that they are either very tender to being touched or they are slow to heal. A small amount of Krazy Glue and the cut seals right up. Before I seal the cut I wash it real good (the dampness from washing seems to promote the chemical reaction of the Krazy Glue). After the Krazy Glue hardens it seems to seal out germs and keeps the cut skin from moving which can cause discomfort. For small cuts there is little in the way of infection, redness, or tenderness.
2) From time to time my finger nail ends become split and the nail becomes very tender. A small amount of Krazy Glue and no more irritation.
3) I was using a pruning saw without gloves and managed to slice up my index finger pretty good. The cut probably should have been repaired by a professional but I fixed it instead. After the cut was washed real good the skin was Krazy Glued back together. From time to time I would have to use more glue where the skin parted from the plastic like glue cover. After about 3 days a small amount of puss was squeezed from the healing cut and then more glue used. Before the cut had healed completely I let the Krazy Glue covering come off and covered the cut with several band-aids. There are two small scars but the finger is back to normal and I think that the Krazy Glue did a good job in promoting the healing by preventing relative movement of the skin in the early stages of healing.
Nature does "calculations" in spacetime, why not us? Date: 1999/01/21
It seems that if you give Nature space, time, and some particles then Nature will figure out what they are to do, how they will interact. We on the other hand seem to need higher dimensional Hilbert spaces in order to calculate what will happen and then only what might happen.
Consider the wave function for a N particle system in 3 dimensions. Psi is a function of 3N space coordinates. Must it be this way? Could quantum mechanics be formulated so that Psi for a many particle system is only a function of 3 space variables? Do things get better or "worse" when we describe many particle systems using 2nd quantized quantum theory in the sense of the number of variables needed to describe a many particle system gets larger?
Link to thread of next article. A momentary point disturbance in even and odd space dimensions. Date: 1999/01/21
Consider a disturbance to a scalar field psi(X,t) in N space dimensions (here X stand for the N space variables of the N dimensional space). Let the disturbance be a delta function in both space and time. Let the scalar field be governed by the wave equation;
Box^2 psi(X,t) == (1/c^2) psi(X,t),tt - Del^2 psi(X,t) = rho(X,t)
We learn from G. Barton in "Elements of Green's Functions and Propagation; potentials, Diffusion and Waves" on page 282:
"In spaces with more than three dimensions, afterglow occurs for all even N. By contrast, when N is odd, the disturbance is restricted to the spherical shell R = c tau ..."
Can anyone give me a hand waving argument or suggestions as to why this is so.
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