Errrrr.... pardon moi, EL, but I believe the poster was
asking how come, if (Maxwell's equations) EM waves can
propagate without a medium, how come other waves can't.
It's not as simple as just merely saying that no wave
can propagate through a vacuum.
START QUOTE
In a nut-shell (no pun intended)...
Maxwell's theory is a theory of waves
in a continuous (i.e., infinitely divisible)
medium. The energy of the waves is also infinitely
divisible so that an indefinitely small amount
can be emitted or absorbed by matter. Classical
physical theories of the 19th century had predicted
that in such a system the energy in equilibrium
would be distributed so as to give an equal amount
to each mode (frequency) of vibration. Because
a continuous medium has an infinite number of modes
of vibration, and the atoms (which constitute matter)
have only a finite number, all the energy of the
universe would be transformed into waves of high
frequency. Maxwell understood this difficulty, which
was later most clearly stated in the Rayleigh-Jeans law
(after two English physicists, Lord Rayleigh and
Sir James Hopwood Jeans) of the radiation of a
blackbody (a body in which the intake and output
of energy are in equilibrium). The German physicist
Max Planck demonstrated that it is necessary to
postulate that radiant-heat energy is emitted only
in finite amounts, which are now called quanta.
At first, it was hoped to retain, without modification,
the theory of light as electromagnetic waves in free
space and to use the quantum concept only in relation
to the interaction between radiation and matter.
In 1905, however, Einstein showed that, in the
photoelectric effect, light behaves as if all the
energy were concentrated in quanta--i.e., particles
of energy now called photons. In the same year,
Einstein published the theory of relativity, which
modified the whole of physics and gave a special role
to the velocity constant c. Because light, in some
situations, behaves like waves and, in others, like
particles, it is necessary to have a theory that
predicts when and to what extent each kind of
behaviour is manifested. The main development of
the quantum mechanics, which does precisely this,
took place between 1925 and 1935.
Light from ordinary sources is emitted by atoms
the phases of which are not correlated with one
another, so that there is a random irregularity
or incoherence between the waves emitted from
different atoms. This places severe restrictions
on the conditions under which the periodicity
associated with wave theory can be observed.
In England, Lord Rayleigh appreciated this effect
and knew that, by the use of pinholes or slits and
light of a narrow range of wavelength, effectively
coherent light could be produced. For a long time,
interest in this topic lapsed. About 1935 Frits
Zernike, a Dutch physicist, and others extended
the theory of coherence to include the concept of
partial coherence. This appeared to be of practical
importance only in a few rather special applications
(e.g., in the Michelson stellar interferometer). [It is
difficult to estimate the accuracy of Michelson's 1927
and 1935 experiments, and it is no longer important
to do so in view of the more accurate measurements
made since 1945. His most important contribution to
the measurement of the velocity was the proof that
the velocity agreed with Maxwell's prediction to
better than one part in a thousand. This gave
confidence to those working on applications of the
electromagnetic theory.] A theory of stimulated
emission, attributable to the work of Einstein
and an English physicist, Paul A.M. Dirac, postulated
that under certain conditions atoms could be made to
radiate in phase so that highly coherent radiation
could be maintained indefinitely. The practical
realization of these conditions, previously thought
to be impossible, was achieved in 1960. A second major
development in the theory of light in this century is
the application of so-called Fourier transform methods
(a mathematical treatment of light waves) to a wide
range of optical problems and, especially, to the
transfer of information in optical systems. Today,
the theory of light has again reached a point at which
all known terrestrial phenomena are included in one
logical theory. The known unsolved problems concern
the transmission of light over the vast distances of
intergalactic space. Here the theory of light impinges
on the science of cosmology.
Historically the theory of electricity and magnetism
developed in the form of a number of empirical laws
each of which was a generalization based on a series
of experiments; e.g., Coulomb's law dealt with the
force between two stationary electric charges.
Maxwell replaced all these laws by a single theory
concisely stated in the form of a set of vector
equations. It has been said that Maxwell's theory is
Maxwell's equations, and indeed it is impossible to do
justice to Maxwell's achievement without use of these
equations. [You may refer to standard texts on
electromagnetic theory for the equations themselves
which are understandable to those who understand them
already, and so not useful here.] However... Electric
and magnetic fields are specified by means of the
vectors E and H with which are associated the
vectors D, B, and J (electric and magnetic induction
and density of electric current). Maxwell's equations
fall into two groups: (1) three constitutive equations
and (2) four field equations. All material bodies
contain electrons. These are negative charges circulating
around heavier nuclei that are positively charged. When
an electric field is applied to a material body, the
average positions of the negative charges relative to
the positions of the positive charges are changed.
This creates an internal electric field. Similarly
the action of a magnetic field on a material changes
the movement of the electrons and sets up an internal
magnetic field. The constitutive equations state that
effects within a material body are proportional to
the applied fields so that the resultant fields within
the body are proportional to the applied field. Certain
constants are defined: is the dielectric constant, is
the magnetic permeability, and is the electrical
conductivity. There is no general agreement, however,
concerning these constants, and therefore some
authorities use a different nomenclature.
The first of the four field equations quantifies certain
properties of the electric induction at the boundary of
a volume that contains a net positive or negative charge.
The second states that, since there are no free magnetic
poles, a certain integral of magnetic quantities is zero.
The third equation states that, when the magnetic flux
through a surface changes, electrical voltages appear on
the boundaries of the surface.
The fourth states that electrical currents in conducting
materials and changes of the electric induction in
nonconducting materials produce magnetic effects.
[When Maxwell's equations are combined, using standard
mathematical methods, a new equation is obtained. It
predicts the existence of electromagnetic waves, with
well-defined properties which says that in free space
(vacuo) electromagnetic waves are propagated with a phase
velocity c. Plane waves are propagated without attenuation.
Spherical waves have an amplitude inversely proportional
to the distance from a small source.]
The field equations (like the constitutive equations)
are linear equations: they state that certain quantities
are proportional to one another; e.g., the third equation
states that the electrical voltages are directly proportional
to the rate of change of magnetic flux. In Maxwell's
equations, electricity and magnetism are two aspects of
one thing called electromagnetism. Maxwell's theory can
indeed be stated in a way that does not mention electricity
and magnetism separately. The three constitutive equations
and the first three of the field equations are precise
formulations of known empirical laws.
In the fourth field equation Maxwell introduced a new
hypothesis--that an electrical change in a nonconductor
produces magnetic effects. This hypothesis--which can be
verified by electrical experiments--leads to the theory of
electromagnetic waves capable of being propagated through
a vacuum.
END QUOTE
As you can see... "waves through a vacuum" is a very
special interpretation of electromagnetism. While
conventionally waves require a medium to propagate
(and this led to Einstein's description of light
traveling through a vacuum NOT as a wave but as a
quantum particle, which is our dearly beloved photon).
Thank you, Einstein, for getting rid once & for all
of that goofy 19th Century delusion... the Ether!
Too bad Einstein simply replaced one myth with another
myth (namely, the delusion that Time AND space have
pertinent/critical existence... while the truth is
that Time only exists in our minds, and Space is only
the absence of anything existing there--But one can't
have everything, so I give thanks for all Einstein
gave us and ignore the usual human prejudices inherent
to the age one inhabits).
> I recommend shaving by Occam's razor, it is the best.
> EL Hemetis
ONLY when the razor is in the hands of a competent
barber (like me, for instance). In the clumsy hands
of a butcher like EL (and others in these NGs, who
shall remain unnamed by me, but who will be only too
eager to show off who/what they are)... all fine
instruments turn destructively cumbersome and crude.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
music.sdrodrian.com
Sent via Deja.com http://www.deja.com/
Before you buy.
Wow! That means that if we're ten miles high [pun]
gravity gets weaker when we go down 10 miles.
And if we're 10 miles deep gravity gets weaker
if we go up 10 miles! [Of course, this seems to
contradict itself, but who cares? It's grand!]
> Man can create his own gravity.
Absolutely: If you jump of a cliff
and land on your feet... your feet
will be so heavy they'll with crack stones
(not just corns)... provided the cliff
was high enough [no pun].
> Nature uses
> gravity in every way.
Except when somebody breaks wind in
a crowded elevator--Stuff goes right up
everybody's noses like lit rockets!
> I would like to think that
> electromagnetizum was a
> form of a gravity force(no way)
Myself, I would like to think that
I have no worries in this world.
> Nature gave us free force of
> gravity.Electricity as a useful energy
> we have to produce our selves. It
> would be nice if we could plug into
> the ground instead of a wall socket.
Save that snippet (it'll make a
hell of an ad for the Earth-Soil
Power Company... E S P ).
> There is no free lunch,
There is too: But one must NOT
be able to afford it (to get it).
I wonder if you got it, Herb.
> but gravity is a free dinner. Herb
Sorry, Herb: Gravity is energy
and energy is NEVER really owned: It's
only rented... so if you stuff yourself
(this Thanksgivings) be prepared to
throw it all up... or to Go To The Can
(do not stop on GO, do not collect $200).
In any case: Happy Thanksgivings!
(And my Bush win.)
S D Rodrian
web.sdrodrian.com
wisdom.findhere.org
There is but one force in the universe
and that is Gravity; the only thing that
exists in the universe is motion, and that
is energy; the only energy that exists
in the universe can only be fundamentally
described as either vectored energy or
as infinite (scalar) mass: Therefore
the only force in the universe is Gravity
(the universe of matter) and, by definition:
the repelling force embodied in the universe
of energy (infinite (scalar) mass).
Gravity is energy (even if you wish
to call energy a force).
> > In any case: Happy Thanksgivings!
> > (And may Bush win.)
>
> He'll fuck up worse than
> Herbert Hoover. I personally
> can't wait.
You may be right, although, unlike
you: I hope he doesn't.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
Sent via Deja.com http://www.deja.com/
Before you buy.
> Gravity is energy (even if you wish to call energy a force).
> S D Rodrian
===========
[EL]
The physics equations treat gravity as a force (LMT^-2).
While energy is work (L^2MT^-2).
Yet an ignorant Rodrian likes to drool drivel driven by Spam unforgiven.
Force to you is like when you were raped by force.
You post to humor because your search engine reported it
when you were looking for hemorrhoids
(you should have used a spelling checker first).
--
Now learn a lesson from the source.
Say after me that gravity is a force.
No need to talk, I know you're a horse.
A horse of course is a horse.
Yet some are sons of whores.
You Spam to often and run off course.
Say gravity is a force of course.
Now don't you try feel remorse.
Its all in books of course of course.
And all the fun is in the pun Up yours.
But a horse can't talk of course.
Say gravity is a force of course.
Like shaking your head
for talking instead
or kick then blow your nose.
Whip flies with your tail
while I tell you the tale.
Attention your legs should close.
Say gravity is a force of course.
But a horse can't talk of course.
You Spam to often and run off course.
Say gravity is a force
--
EL Hemetis
> Gravity is energy (even if you wish
> to call energy a force).
Rod: How does a rodent screw a lightbulb ?
Simple , the force of gravity . Sit and spin rodent .
Use the energy of gravity powering your lightbulb , to read by
and ponder the following .
--
Rod Ryker...
It is reasoning and faith that bind truth .
http://homestead.deja.com/user.ryker1/index.html
Why is there no discernable upper limit to the amplitude of energy that
can be transmitted through "nothing" or vacuum?
The one caveat: no "messenger particles" are allowed. Such "messengers"
are invoked when logic is stymied, and are the modern equivalent of the
deities of ancient priesthoods.
So what does pure logic say to the aforementioned question? "Messenger
particles"? Or, a superdense, pre-existant Matrix underlying the
superficial phenomena of matter/energy?
(This Matrix is not to be confused with the 'ether'. As the
word implies, 'ether' is tenuous and insubstantial in comparison to
matter, making 'ether' the diametric opposite of the Matrix of space. To
this Matrix, the universe of matter/energy is the tenuous and diaphanous
after-thought tagged on.)
The late physicist David Bohm was one of the few
'mainstream' scientists to posit such a concept. He saw the phenomenal
density of space itself as primal to all else - and the Newtonian
universe as a great hologram within it. Dr. Karl Pribram, a Stanford
neurophysiologist, was a corroborator with Bohm on the holographic
nature of reality.
Two websites worth checking out on Bohm and Pribram are -
www.crystalinks.com/holographic.html
oc
The truth is the mandate of the strong.
(I ripped off, "Might is right." Sue me.)
> It is only an idenitifcation of congrunecy between a
> mathematically-presentable model, and
> general principles operable in all
> experience.
You mean it's true then that 1 and 1 = 11 ...?
> Your equivocation of experience
> and existence is a patent
> mistake, ignoring the nature
> of your hypotheses.
I, on the other hand, propose
that I have enough experience.
> Creating a consistent mathematical model
> does not prove that all
> principles have been accounted for.
1 and 1 = 11 ...?
> Besides which, the model of which
> you speak is not consistent.
1 and 1 <> 11 ...?
> If time does not exist, and the
> 'illusion' of duration is only because
> of the existence of simlar and proximate
> records, you still have the
> sticky problem of explaining why
> we experience *any* now,
Because the Novocain has wore off, pardner!
> let alone, the
> same one, together.
That is only a mental paradox (semantically
superfluous, since paradoxes can only exist
in the mind). "Get yourself together, man!"
is simply a common expression (one never
experiences the necessity to combine with
none other). Besides, as I have been trying
to tell you: The same 1 together (with the
other 1, I assume) is always eleven, and
always will be 11.
> Also - extension does not predicate emptiness.
I am thinking now of a vast extent of
emptiness: Rats! There is no way for you
to understand this. O well....
> The infinte extent of
> various fields means that there is
> no such thing as 'void'.
Which fields are these? If it's a
baseball field... you're going to get
a lot of grief from batters trying for a
homerun!
S D Rodrian
web.sdrodrian.com
wisdom.findhere.org
> -Tm
re:
> Straylight wrote:
> >
> > This is not an overal criticism of
> > the argument,just a nedling of one point:
> >
> > " The THING that must exist is SOMETHING enduring
> > AND now you have ALL THERE IS TO EXISTENCE: Motion! "
> >
> > How can there be motion in space
>
> Motions is everywhere (and, in fact, by definition
> motion is all there is to matter/energy, and
> therefore where there is no matter/energy, there
> is no motion... so it's something of a misnomer
> to say that there is motion IN space--just
> semantics, but it may help you to understand).
>
> > without time to diferentiate between
> > "frames" of location relative to itelf
> > as it moves/has moved in that
> > space?
>
> There are no "frames" to differentiate (except IN
> the human mind). Motions is unending, unstopping
> and absolutely relativistic INSIDE the universe.
>
> By definition TIME requires at least two motions:
> The one times, and the one against which the first
> motion is timed: As you can see, time is a development
> AFTER motion (if you have one motion, it is impossible
> to describe it as slow/fast/OR moving AT ALL ... and
> yet it still exists... that is absolute rest, or the
> universe of energy). You have an irresistible force
> meeting an immovable object (a paradox ONLY in the
> mind, as there are no paradoxes in the universe).
> They meet. Outside the universe one or the other
> may win, but INSIDE the universe they will both
> cancel out because MOTION is relative in here: The
> immovable object is only immovable in relation to
> other motions, while the irresistible force is only
> irresistible in relation to other motions: They meet.
> And become a third motion: Conservation of energy,
> conservation of motion (energy = motion). All that
> exists is motion (energy). All else, the timing of
> motions, the measurements of energy... that is for us
> to entertain ourselves with.
>
> > If movement is your definition of a
> > "constant instant" you forget that
> > movement itself is a progressive marker.
>
> There are no pauses or "instants" in nature:
> There is only eternal, unstopping motion.
> A block of steel may seem to you as if it is
> solidly "on hold" (or motionless) only IF
> you do not understand the idea of atoms and
> subparticles.
>
> > Just trying to join in the fun!
> > Straylight
>
> Welcome to the madhouse slugfest!
> Look: No commercials. (Only kooks.)
>
> S D Rodrian
> wisdom.findhere.org
> web.sdrodrian.com
What is a force? What is gravity? SEE:
http://www.geocities.com/absoluterelativity/ar-11.htm
Energy is motion, motion does/is work. (There:
isn't that much simpler to understand/visualize.)
Gravity is energy, energy is the force of motion.
The conservation of energy IS the conservation of
motion: A large, slow motion = a small, fast motion.
Individual motions in the universe neither come into
existence or cease to exist... rather, they transfer
their energy to other motions to slow down (Newton)
and acquire energy from other motions to speed up.
(There, now you understand the universe, and you
didn't even have to be an understanding person.)
S D Rodrian
web.sdrodrian.com
sdrodrian.com
PS. The infantile portions of the original post
do not merit a response.
> EL Hemetis
> Rod Ryker...
Bill, because of the skin effect of voltage differential.
Thermal differential is the matrix's instantaneous self messenger. The
ether is internally bipolar in neutral conformity to an uniform
homogenous physical frequency reality. The rest are localized
dimensional states of curved distortions, and relative, as Dr. Einstein
predicted. The thermal coefficient is the tensor that acts as the
elastic conduct for upper or lower limit of degree of reflection of
variant kinetic motion. The Master frequency of totality of potential
uniform neutral force itself invariant but at once reducible into
multiple sub octaves of point or wave like dynamic singularity, of
attractive or repulsive higher or lower resonance's and pitch. As
nonuniform motion or velocity changes + or - , so does the voltaic
differential and hence its thermal state. All electric charge therefore
seeks body of most uniform motion, non resistance, or ground state.
the nightbat
Although it IS quite possible that scientists
may yet find some rationalization or other to
disreguard the evidence of the reh-shifts...
the fact will always remain that the galaxies ARE
receding from each other as Hubble first described
them:
Dogma may be forced upon some men, but
science will ultimately always
reassert the freedom of all men.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
S D Rodrian
wisdom.findhere.org
web.sdrodrian.com
re:
In article <8ve413$jmr$1...@nnrp1.deja.com>,
rry...@hotmail.com wrote:
> In article <8vdm3t$8aa$1...@nnrp1.deja.com>,
> S D Rodrian <Rod...@mad.scientist.com> wrote:
>
> > Gravity is energy (even if you wish
> > to call energy a force).
>
> Rod: How does a rodent screw a lightbulb ?
> Simple , the force of gravity . Sit and spin rodent .
> Use the energy of gravity powering your lightbulb , to read by
> and ponder the following .
>
> [EL]
> The physics equations treat gravity as a force (LMT^-2).
> While energy is work (L^2MT^-2).
I'm afraid this is a common misconception with
regards to this particular case: Gravity NEVER
weakens or strengthens but, like a beam of light,
becomes dispersed (thinned out) by distance AND
by another source's gravity running counter to it:
When you go ten miles up from the surface
of the earth... the beam's concentration
becomes dispersed (thinned) into more distance
the farther up you go. So that, in the beam analogy,
the light shining on you will grow dimmer.
But when you go ten miles down in the planet
the concentration ALSO becomes dispersed, this
time by the gravitational effect of all the mass
around you and above you (it is as if the photons
of one beam of light were canceled out and neutralized
by the photons of another intersecting beam of light
with the net result being the same as before... there
are less photons available to you and therefore it all
gets just as dim as if there were only one beam of
light and you were traveling away from it):
Gravity itself can cancel out gravity just as
effectively as distance so that as you go
down farther and farther into the planet you
will weigh less and less (without being crushed
as if between two massive bodies, assuming you're
descending via some astonishingly hardened shaft)
until at the center of the planet you will "experience"
no effect of gravity at all (and you'll be able to
float down there as you would in outer space... provided
there's a great big room there for you to do it in).
This misconception plays a funny role in movies
such as, "Voyage To The Center of The Earth"
where at that "center" they find an ocean very
coolly lying on its bed while the voyagers' rings
and even gold teeth are "sucked upwards."
> <snip>
> Of course the rest of his ideas are, well, rather unique.
>
> Regards,
> Jim
On Wed, 22 Nov 2000 18:16:54 GMT, S D Rodrian
<Rod...@mad.scientist.com> wrote:
>No reply required: I couldn't possibly add anything
>that would be less flattering here to the poster
>than the unflattering self-portrait the poster
>paints of himself with his own post.
>
>S D Rodrian
>wisdom.findhere.org
>web.sdrodrian.com
>
>re:
>
>In article <8ve413$jmr$1...@nnrp1.deja.com>,
> rry...@hotmail.com wrote:
>> In article <8vdm3t$8aa$1...@nnrp1.deja.com>,
>> S D Rodrian <Rod...@mad.scientist.com> wrote:
>>
> Energy is motion, motion does/is work. (There:
> isn't that much simpler to understand/visualize.)
But you seem to have screwed it up anyway. There is no motion in chemical
potential energy. The fact that there definitely is stored chemical energy
is evident every time you switch on a flashlight/torch.
> Gravity is energy, energy is the force of motion.
Your concept of energy needs to be expanded to include stored energy that
has no motion associated with it, like that snow shelf that could be
triggered by a sharp noise into collapsing into an avalanche.
Tom Davidson
Brighton, CO
I've considered that. Have you considered
that it is you who may be wrong?
> There is no motion in chemical potential energy.
Existence itself, whether called energy or motion,
is all there is to the universe (potential energy in
the form of the universe of energy, work in the form
of the universe of matter). However, there being
such dearth of even the most basis knowledge about
the nature/definition of the term "energy" that here
follow a few very brief, but very pertinent quotes
on the matter (intended to highlight why/how energy
is motion/motion is energy). Period.
START QUOTE
1) Energy may exist in potential, kinetic, thermal,
electrical, chemical, nuclear, or other various forms.
There are, moreover, heat and work--i.e., energy in
the process of transfer from one body to another.
After it has been transferred, energy is always
designated according to its nature. Hence, heat
transferred may become thermal energy, while work done
may manifest itself in the form of mechanical energy.
All forms of energy are associated with motion. [For
example, any given body has kinetic energy if it is
in motion. A tensioned device such as a bow or spring,
though at rest, has the potential for creating motion;
it contains potential energy because of its configuration.
Similarly, nuclear energy is potential energy because it
results from the configuration of subatomic particles
in the nucleus of an atom. Energy can be converted from
one form to another in various ways. Usable mechanical
or electrical energy is, for instance, produced by many
kinds of devices, including fuel-burning heat engines,
generators, batteries, fuel cells, and magnetohydrodynamic
systems.] "Interparticle forces not only affect the
chemical and physical behaviour of substances, they
also determine to a large extent how a particle will
RESPOND to the APPROACH of a different particle. If
the two particles REACT with each other to FORM new
particles, a chemical reaction has occurred."
2) The energy of a body represents its ability to do
work, and work itself is a force acting over a distance:
Chemical systems can have both kinetic energy (energy
of motion) and potential energy (stored energy). The
kinetic energy possessed by any collection of molecules
in a solid, liquid, or gas is known as its thermal energy.
The temperature at which all molecular motion comes to
a halt is known as absolute zero. Work, in physics,
is the measure of energy transfer that occurs when
an object is moved over a distance by an external force
at least part of which is applied in the direction of
the displacement. If the force is constant, work may be
computed by multiplying the length of the path by
the component of the force acting along the path. Work
done on a body is accomplished not only by a
displacement of the body as a whole from one place
to another but also, for example, by compressing a gas,
by rotating a shaft, and even by causing invisible
motions of the particles within a body by an external
magnetic force. Work done on a body is equal to the
increase in the energy of the body, for work transfers
energy to the body. If, however, the applied force is
opposite to the motion of the object, the work is
considered to be negative, implying that energy is
taken from the object.
3) Potential energy is stored energy that depends upon
the relative position of various parts of a system. A
spring has more potential energy when it is compressed
or stretched. A steel ball has more potential energy
raised above the ground than it has after falling to
the Earth. In the raised position it is capable of
doing more work. Potential energy is a property of a
system and not of an individual body or particle; the
system composed of the Earth and the raised ball, for
example, has more potential energy as the two are farther
separated. Potential energy arises in systems with parts
that exert forces on each other of a magnitude dependent
on the configuration, or relative position, of the parts.
In the case of the Earth-ball system, the force of gravity
between the two depends only on the distance separating
them. The work done in separating them farther, or in
raising the ball, transfers additional energy to the
system, where it is stored as gravitational potential
energy. [Potential energy also includes other forms: The
energy stored between the plates of a charged capacitor
is electrical potential energy. What is commonly known
as chemical energy, the capacity of a substance to do work
or to evolve heat by undergoing a change of composition,
may be regarded as potential energy resulting from the
mutual forces among its molecules and atoms. Nuclear
energy is also a form of potential energy.] The potential
energy of a system of particles depends only on their
initial and final configurations; it is independent of
the path the particles travel. In the case of the steel
ball and the earth, if the initial position of the ball
is ground level and the final position is ten feet above
the ground, the potential energy is the same, no matter
how or by what route the ball was raised. The value of
potential energy is arbitrary and relative to the choice
of reference point. In the case given above, the system
would have twice as much potential energy if the initial
position were the bottom of a ten-foot-deep hole.
Gravitational potential energy near the Earth's surface
may be computed by multiplying the weight of an object
by its distance above the reference point. In bound
systems, such as atoms, in which electrons are held by
the electric force of attraction to nuclei, the zero
reference for potential energy is a distance from the
nucleus so great that the electric force is not detectable.
In this case, bound electrons have negative potential
energy, and those just free of the nucleus and at rest
have zero potential energy. Potential energy may be
converted into energy of motion, called kinetic energy,
and in turn to other forms such as electrical energy.
Thus, water behind a dam flows to lower levels through
turbines that turn electric generators, producing
electric energy plus some unusable heat energy resulting
from turbulence and friction. Historically, potential
energy was included with kinetic energy as a form of
mechanical energy so that the total energy in
gravitational systems could be calculated as a constant.
Energy also may be stored in atoms or molecules as
potential energy. When protons/neutrons combine to form
the nucleus of a certain element, the reduction in
potential energy is matched by the production of a huge
quantity of kinetic energy.
[Consider, for instance, the formation of the deuterium
nucleus from one proton and one neutron. The fundamental
mass unit of the chemist is the mole, which represents
the mass, in grams, of 6.02 X 10(23 power) individual
particles, whether they be atoms or molecules. One mole
of protons has a mass of 1.007825 grams and one mole
of neutrons has a mass of 1.008665 grams. By simple
addition the mass of one mole of deuterium atoms
(ignoring the negligible mass of one mole of electrons)
should be 2.016490 grams. The measured mass is 0.00239
gram less than this. The missing mass is known as the
binding energy of the nucleus and represents the mass
equivalent of the energy released by nucleus formation.
By using Einstein's formula for the conversion of mass
to energy (E=MC^2), one can calculate the energy equi-
valent of 0.00239 gram as 2.15 X 10(8 power) kilojoules.
This is approximately 240,000 times greater than the
energy released by the combustion of one mole of methane.
Such studies of the energetics of atom formation &
interconversion are part of a specialty known as nuclear
chemistry. NOTE: The energy released by the combustion
of methane is about 900 kilojoules per mole. Although
much less than the energy released by nuclear reactions,
the energy given off by a chemical process such as
combustion is great enough to be perceived as heat and
light. Energy is released in so-called exothermic
reactions because the chemical bonds in the product
molecules, carbon dioxide and water, are stronger and
stabler than those in the reactant molecules, methane
and oxygen. The chemical potential energy of the system
has decreased, and most of the released energy appears
as heat, while some appears as radiant energy, or light.
The heat produced by such a combustion reaction will
raise the temperature of the surrounding air and, at
constant pressure, increase its volume. This expansion
of air results in work being done. In the cylinder
of an internal-combustion engine, for example, the
combustion of gasoline results in hot gases that expand
against a moving piston. The motion of the piston turns
a crankshaft, which then propels the vehicle. In this
case, chemical potential energy has been converted to
thermal energy, some of which produces useful work. This
process illustrates a statement of the conservation of
energy known as the first law of thermodynamics. This
law states that, for an exothermic reaction, the energy
released by the chemical system is equal to the heat
gained by the surroundings plus the work performed. By
measuring the heat and work quantities that accompany
chemical reactions, it is possible to ascertain the
energy differences between the reactants and the products
of various reactions. In this manner, the potential
energy stored in a variety of molecules can be determined,
and the energy changes that accompany chemical reactions
can be calculated.]
4) Kinetic energy is that form of energy that an object
or a particle has by reason of its motion. If work, which
transfers energy, is done on an object by applying a net
force, the object speeds up and thereby gains kinetic
energy. Kinetic energy is a property of a moving object
or particle and depends not only on its motion but also
on its mass. The kind of motion may be translation (or
motion along a path from one place to another), rotation
about an axis, vibration, or any combination of motions.
[The total kinetic energy of a body or a system is equal
to the sum of the kinetic energies resulting from each
type of motion.] For a rotating body, the moment of
inertia, I, corresponds to mass, and the angular velocity
(omega), w, corresponds to linear, or translational,
velocity. Accordingly, rotational kinetic energy is equal
to one-half the product of the moment of inertia and
the square of the angular velocity, or 1/2 Iw(2 power).
[In an inelastic collision the sum of internal and
external energies is conserved, but some of the external
energy of bodily motion is irretrievably transformed
into internal random motions. The conservation of energy
is expressed in the macroscopic language of the first law
of thermodynamics--namely, energy is conserved provided
that heat is taken into account. The irreversible nature
of the transfer from external energy of organized motion
to random internal energy is a manifestation of the second
law of thermodynamics. The irreversible degradation of
external energy into random internal energy also explains
the tendency of all systems to come to rest if left to
themselves. If there is a configuration in which the
potential energy is less than for any slightly different
configuration, the system may find stable equilibrium
here because there is no way in which it can lose more
external energy, either potential or kinetic. This is
an example of an extremal principle--that a state of stable
equilibrium is one in which the potential energy is a
minimum with respect to any small changes in configuration.
It may be regarded as a special case of one of the most
fundamental of physical laws, the principle of increase of
entropy, which is a statement of the second law of
thermodynamics in the form of an extremal principle--the
equilibrium state of an isolated physical system is that
in which the entropy takes the maximum possible value.
[Force, in mechanics, is any action that tends to maintain
or alter the position of a body or to distort it. The
concept of force is commonly explained in terms of Newton's
three laws of motion set forth in his Principia Mathematica
(1687). According to Newton's first principle, a body that
is at rest or moving at a uniform rate in a straight line
will remain in that state until some force is applied to
it. The second law says that when an external force acts
on a body, it produces an acceleration (change in velocity)
of the body in the direction of the force. The magnitude
of the acceleration is directly proportional to the
magnitude of the external force and inversely proportional
to the quantity of matter in the body. Newton's third law
states that when one body exerts a force on another body,
the second body exerts an equal force on the first body.
This principle of action and reaction explains why a force
tends to deform a body (i.e., change its shape) whether or
not it causes the body to move. The deformation of a body
can usually be neglected when investigating its motion.]
5) Late in the 18th century, the interrelated work of
Joseph Priestley and Antoine-Laurent Lavoisier led to
the overthrow of the "phlogiston" theory. Lavoisier saw
Priestley's discovery of oxygen in 1774 as the key to
the weight gains known to accompany the burning of sulfur
and phosphorus and the calcination of metals (oxide
formation). In his Traité élémentaire de chimie, he
clearly established that combustion consists of a chemical
combination between oxygen from the atmosphere and
combustible matter. By the end of the century, his ideas
were widely accepted and had been successfully applied
to the more complex processes of respiration and of
photosynthesis. [Reactions in which oxygen was consumed
were classified as oxidations, while those in which
oxygen was lost were termed reductions.] During the 19th
century, the evolving field of electrochemistry led to
a broadened view of oxidation. It was possible, for
instance, to produce the ferric, or iron(III), ion from
the ferrous, or iron(II), ion at the anode (positive
electrode, where electrons are absorbed from solution)
of an electrochemical cell (a device in which chemical
energy is converted to electrical energy). The similarity
of the two processes led to a precursor of the electron-
transfer explanation for redox reactions. After the
discovery of the electron, the conviction that oxidation
and reduction are accomplished through electron loss
and gain became firmly entrenched. Thus, early in the
20th century chemists tended to attribute all redox
reactions to the transfer of electrons. Later work on
chemical bonding, however, demonstrated the incorrectness
of that description. An electronegativity scale (listing
of elements in descending order of their tendency to
attract and hold bonding electrons) provided a firm basis
for the oxidation-state assignments on which oxidation-
reduction definitions have become based. [The very first
approximation of the true nature of combustion was posited
by Lavoisier, who discovered in 1772 that the products of
burned sulfur or phosphorus, in effect their ashes,
outweighed the initial substances, and postulated that
the increased weight was due to their having combined
with air. Interestingly, it was already known that metals
transformed by heat to metallic ash weighed less than
the metallic ash, but the theory was that in certain cases
phlogiston in metals had a negative weight, and upon
escaping during combustion, left the ash of the metal
heavier than it had been with the phlogiston in it. Later,
Lavoisier concluded that the "fixed" air that had combined
with the sulfur was identical to a gas obtained by
Priestley on heating the metallic ash of mercury--that is,
the "ashes" obtained when mercury was burned could be made
to release the gas with which the metal had combined. This
gas was also identical to that described by the Swedish
chemist, Carl Wilhelm Scheele, as an active fraction of air
that sustained combustion. Lavoisier called the gas "oxygen."
[Combustion, with rare exceptions, is a complex chemical
process involving many steps that depend on the properties
of the combustible substance. It is initiated by external
factors such as heat, light, and sparks. The reaction sets
in as the mixture of combustibles attains the ignition
temperature, and several aspects of this step can be defined.
First, a relationship exists between the ignition temperature
and the pressure of the mixture under specific conditions.
Only one temperature corresponds to a given pressure, whereas
one or three pressures, called the explosion limits, may
correspond to one temperature. The mechanism of the reaction
determines the explosion limits: the reaction can proceed
only when the steps in the sequence of reactions occur faster
than the terminal steps. Thus, for combustion to be initiated
with light, or with a spark, the light intensity or the spark
energy must exceed certain minimal values. The complexity of
the combustion reaction mechanism and the rapidly varying
temperatures and concentrations in the mixture make it
difficult and often impossible to derive an equation that
would be useful for predicting combustion phenomena over
wide temperature and concentration ranges. Instead, use is
made of empirical expressions derived for specific reaction
conditions.]
6) Electromagnetism is the science of charge and of the forces
and fields associated with charge. Electricity and magnetism
are two aspects of electromagnetism. Electricity and magnetism
were long thought to be separate forces. It was not until the
19th century that they were finally treated as interrelated
phenomena. In 1905 Albert Einstein's special theory of
relativity established beyond a doubt that both are aspects
of one common phenomenon. At a practical level, however,
electric and magnetic forces behave quite differently and
are described by different equations. [Electric forces are
produced by electric charges either at rest or in motion.
Magnetic forces, on the other hand, are produced only by
moving charges and act solely on charges in motion.
Electric phenomena occur even in neutral matter because
the forces act on the individual charged constituents.
The electric force, in particular, is responsible for most
of the physical and chemical properties of atoms and
molecules. It is enormously strong compared with gravity.
For example, the absence of only one electron out of every
billion molecules in two 70-kilogram (154-pound) persons
standing two metres (two yards) apart would repel them with
a 30,000-ton force. On a more familiar scale, electric
phenomena are responsible for the lightning and thunder
accompanying certain storms. Electric and magnetic forces
can be detected in regions called electric and magnetic
fields. These fields are fundamental in nature and can exist
in space far from the charge or current that generated
them. Remarkably, electric fields can produce magnetic
fields and vice versa, independent of any external charge.
A changing magnetic field produces an electric field, as
the English physicist Michael Faraday discovered in work
that forms the basis of electric power generation.
Conversely, a changing electric field produces a magnetic
field, as the Scottish physicist James Clerk Maxwell
deduced. The mathematical equations formulated by Maxwell
incorporated light and wave phenomena into electro-
magnetism. He showed that electric and magnetic fields
travel together through space as waves of electromagnetic
radiation, with the changing fields mutually sustaining
each other. Examples of electromagnetic waves traveling
through space independent of matter are radio and
television waves, microwaves, infrared rays, visible light,
ultraviolet light, X rays, and gamma rays. All of these
waves travel at the same speed--namely, the velocity of
light (roughly 300,000 kilometres, or 186,000 miles,
per second). They differ from each other only in the
frequency at which their electric and magnetic fields
oscillate. Maxwell's equations still provide a complete
and elegant description of electromagnetism down to,
but not including, the subatomic scale. The interpretation
of his work, however, was broadened in the 20th century.
Einstein's special relativity theory merged electric and
magnetic fields into one common field and limited the
velocity of all matter to the velocity of electromagnetic
radiation. During the late 1960s, physicists discovered
that other forces in nature have fields with a mathematical
structure similar to that of the electromagnetic field.
These other forces are the nuclear force, responsible for
the energy released in nuclear fusion, and the weak force,
observed in the radioactive decay of unstable atomic nuclei.
In particular, the weak and electromagnetic forces have
been combined into a common force called the electroweak
force.] Two English scientists, William Nicholson and
Anthony Carlisle, used a chemical battery to discover
electrolysis (the process in which an electric current
produces a chemical reaction) and initiate the science of
electrochemistry. In their experiment the two employed
a voltaic pile to liberate hydrogen and oxygen from water.
They attached each end of the pile to brass wires and
placed the opposite ends of the wires into salt water.
The salt made the water a conductor. Hydrogen gas
accumulated at the end of one wire; the end of the other
wire was oxidized. Nicholson and Carlisle discovered
that the amount of hydrogen and oxygen set free by the
current was proportional to the amount of current used.
By 1809 the English chemist Humphry Davy had used a
stronger battery to free for the first time several very
active metals--sodium, potassium, calcium, strontium,
barium, and magnesium--from their liquid compounds.
Faraday, who was Davy's assistant at the time, studied
electrolysis quantitatively and showed that the amount
of energy needed to separate a gram of a substance from
its compound is closely related to the atomic weight
of the substance. Electrolysis became a method of
measuring electric current; and the quantity of charge
that releases a gram atomic weight of a simple element
is now called a faraday in his honour. Once scientists
were able to produce currents with a battery, they could
study the flow of electricity quantitatively. Because of
the battery, the German physicist Georg Simon Ohm was able
experimentally in 1827 to quantify precisely a problem that
Cavendish could only investigate qualitatively some 50
years earlier--namely, the ability of a material to
conduct electricity. The result of this work--Ohm's law--
explains how the resistance to the flow of charge depends
on the type of conductor and on its length and diameter.
According to Ohm's formulation, the current flow through
a conductor is directly proportional to the potential
difference, or voltage, and inversely proportional to
the resistance--that is, i = V/R. Thus, doubling the
length of an electric wire doubles its resistance, while
doubling the cross-sectional area of the wire reduces the
resistance by a half. Ohm's law is probably the most
widely used equation in electric design.
> The fact that there definitely is stored chemical energy
> is evident every time you switch on a flashlight/torch.
Read carefully above: In a simple analogy... The potential
energy stored in a battery is in the form of "unbalanced"
negatively-charged atoms, which, given the chance to
"balance out" (against/with) other positively-charged atoms
... establishing a "flow" (exchange) of electrons.
END QUOTE
> > Gravity is energy, energy is the force of motion.
>
> Your concept of energy needs to be expanded to
> include stored energy that
> has no motion associated with it,
ONLY as a semantic convenience, remember: E=MC^2
(Or, if an atom stops "moving," does it still
remain an atom? ... Absolutely: NOT.)
> like that snow shelf that could be
> triggered by a sharp noise into collapsing
> into an avalanche.
Precisely: That snow shelf is entirely made of
matter with a definite mass (if it's just a couple
of flakes its WORK will be very slight, and if it's
a couple of thousand tons... watch out, because
it will WORK wonders downhill)... BUT all matter
(whose mass has "weight" or "inertia") is at its
most fundamental... nothing but motion (or energy,
as in "E=MC^2"), OR atoms cannot be split, my friend.
S D Rodrian
web.sdrodrian.com
sdrodrian.com
> Tom Davidson
> Brighton, CO
You logic is almost as well-ironed as mine:
Indeed, even you and I don't exist, and
are only momentary shapes in the mind (which
also doesn't exist). I say:
Enjoy it while it lasts!
S D Rodrian
web.sdrodrian.com
Harry, this theory is misnamed. It should
be called: The Theory By Falling Brains.
S D Rodrian
wisdom.findhere.org
Mmmmmmmm......
Isn't that another version of:
Who made man, God? Then, who made God?
S D Rodrian
web.sdrodrian.com
wisdom.findhere.org
re:
In article <geron-21110...@lc0844.zianet.com>,
ge...@hotmail.com (geron) wrote:
> In article <8vdmas$8bm$1...@nnrp1.deja.com>, S D Rodrian
> Supergravity and the false vacuum is everything, everything we
perceive of
> came from Supergravity. The problem is the definition of what 'is'
is.
> <g>
>
> Everyday, run-of-the-mill gravity is a negative force, the sumtotal of
> which is exactly equal to the mass/energy of the universe. At the
> beginning of this universe, energy was borrowed from Supergravity,
before
> complete symmetry breakdown, in the form of 'normal' gravity, so that
all
> (positive) mass/energy will always exactly balance the (negative)
gravity
> we perceive.
>
> Nothing actually exists, or put another way, 'nothing' actually
exists.
> It's just been sublimely 'borrowed' from the potential of the inflaton
> field (false vacuum). Baby universes emerge from their extremely old
and
> inflated (overstretched) parent universes, nothing can stop this
process,
> it will never end. And there never was a time without or 'before'
> universes, not only because universes create their own time, or the
> illusion we name time -they're closed and self-referential, but
because
> there never was a time without universes. You might think that this
> sounds redundant, circular and self-contingent, and you'd be right,
but
> this is one of the paradoxes of Chaotic Inflation.
>
> Geron
Actually, what you wish to know is what the
difference is between standing 10 feet from
the earth and standing exactly between two
earth planets which have my magic come to rest
twenty feet from each other.... And the answer is:
In the first case you would slam into the
single earth and break