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    B Distribution of energy in the electric field surrounding an electron

    I am thinking about how an electric field has energy associated with it. If a single electron exists alone in a remote vaccuum, I believe it has it's own electric field surrounding it, and that this field has an energy content associated with it. My question is; does this electric field store...
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    I Find the distance between the two apexes of two three-sided pyramids

    A way to imagine this problem to stand on a plane. You have chosen three points on that plane to create a triangle-base and from these three points you can make distance measurements in any direction. You know the distance between each of the three points of the base, but you do not yet know...
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    B Perihelion shift of orbit of Mercury according to General Relativity

    Recently, when reading an entry about Mercury's perihelion shift, someone mentioned a "hand-wavy" explanation as to why GR predicts the orbit so precisely. I was wondering if there was some elementary way to expound on what he was saying. Fundamentally, the comment said something to the effect...
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    From the point of view of a chemist, are there any issues around drinking boiled, concentrated tap water every day?

    Recently I have been boiling tap water, for about 30 minutes, everyday for drinking water. The reason I do it is because I don't like the taste of chlorimines and chlorine and this is the only way I know to get rid of them with out also losing minerals. It works great, and in fact, the water...
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    I Transparency of a gas compared to a plasma

    I imagine an empty region of space, in between stars, or even galaxies. This void is filled only with a uniform distribution of hydrogen particles. I won't specify how dense this field is, but I would like to know which is more transparent to photons, a gas of hydrogen atoms, hydrogen...
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    B Is an electron beam affected by photons?

    I am wondering if one of the prerequisites of the double-slit experiment, when done with electrons, is that the beams must be in a dark vaccuum tube so as to not destroy the interference pattern. I am trying to learn if the beams will lose their interference pattern because the particles of the...
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    B Gravitational signature of a photon in a double slit experiment

    I'm trying to think of a how the double slit experiment can detect a photon without interacting with it in theory. In principal (not reality of course) does a photon have a gravitational signature which could be used to detect which slit it traveled through during the double slit experiment...
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    I Are electro-magnetic waves the same as the wave function?

    When studying classical mechanics we are told that light is the propogation of electromagnetic waves. This makes perfect sense, as I can imagine these fields behaving this way, and in turn have an associated wave length. When learning about QM, I have heard that the wavelength of a (any)...
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    Electronics Portable Solar panel system to run a small computer fan

    Hi all. Recently I purchased two portable USB solar panels, which are rated at 5 watts each. They both came with a 'battery bank' consisting of a single battery all running on 5 volts. I also purchased a 5 volt USB computer fan. My question is; can plug all these things in together so that...
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    I Measuring the mass of an object near the event horizon of a black hole and observing the results at a distance

    In a recent thread we discussed the idea that an object slowly dropped into a black hole, can have its rest mass recovered, as energy, if slowly brought to a halt at the event horizon. Once the object is dropped, it would be unrecoverable, and the BH would gain no new mass. I am under the...
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    I The release of potential energy between two black holes goes to infinity as they collide?

    Imagine two black holes at great distance. They are both spatially separate and both completely collapsed to a singularity. Gravity begins to pull them together. According to the equation for the gravitation potential energy of two objects at distance… Ug = -GMm/r …These two objects begin...
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    I Is it possible to reduce or modify Einstein's Field Equations so they exactly mirror Newtonian gravity behavior?

    Is it possible to reduce and/or modify the EFE so that they make the exact same prediction as Newton's law of gravity? I am wondering if the slight differences in prediction from these two mathematical approaches can be identified at a particular place in the EFE or if it's the geometrical...
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    I The association of energy, pressure, mass, etc. with the four dimensions in Einstein's Field Equations

    While viewing a recent lecture on Einstein’s Field Equations, the presenter made the association between the various quantities like mass, energy, momentum and pressure directly to the four dimensions of spacetime. Depending on which derivation of the FE he was explaining, he would make an...
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    Strange question about cancelling electric fields

    I am curious about the case where two electric or magnetic fields cancel each other out (I'm assuming this is possible). If a charged particle travels through the region where the cancellation exists, I am assuming the particle behaves as if no field exists. Does that area still have electric...
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    Do electric fields have their own separate inherent charge?

    I am assuming the answer is NO. I realize that the electric field of any charged object has an energy density, but I was curious to know it that same field has it's own 'charge density' so to speak, and that it would have a small secondary electric field of it's own. This would imply that...
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    I Can empty space be considered ‘elastic’ and expandable?

    The intention of this question is to get to the heart of the geometrical properties of space-time according to GR, and to focus entirely on what the theory allows, and not so much on what we actually see. I would like to consider a perfect vacuum, in a euclidian infinite void, completely devoid...
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    Is the energy of an electric field greater than the sum of its electrons' electric fields?

    I understand that the energy of an electric field arises from the work put into gathering the electrons together to create the field. Bringing electrons close together requires energy because they naturally want to repel. This potential energy is stored in the field itself and the field has an...
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    I Is the Universe a 3-sphere or a 4-sphere?

    When discussing the shape of the universe (flatness/curvature), I often hear of three possible examples; spherical, flat and hyperbolic. Presenters will often use a 2-D analogy of how a flat sheet can be curved or shaped, like a saddle, table, or surface of a ball, where triangles can be defined...
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    I Can an object fall into a black hole at faster that the speed of light?

    I am wondering if an object can fall into a blackhole at faster that the speed of light. I have heard that the expansion of the universe can make distant galaxies appear to recede from one another at velocities faster than the speed of light.

 Intuitively, this makes sense to me. I am...
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    Anti-matter annihilation and the CMBR

    Recently I watched a lecture on Anti-matter and the Standard Model... ...At one point Dr. Quinn, makes the statement that the CMB is the resulting energy left over from the annihilation of the matter and anti-matter which arose during cosmic inflation (leaving behind only one part in 30 million...
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    Alan Guth thought experiment about negative energy and gravity

    Recently, I watched a lecture with Alan Guth. He made an interesting statement. He said that to create an electric field requires work, because the like-charges prefer to repel one another, therefore this requires energy to bring them together. However; because gravity is attractive, it requires...
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    Defining negative energy of gravitational field

    I have been learning that gravity has a negative energy associated with it. I've heard this stated a couple different ways, but I would like to understand a distinction. One line of thought declares that the potential energy of an object within a gravitational field is negative. Another line...
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    Relativity and particle collision.

    I have a question; If two particles (let's say protons) collide at high speed, they can produce heavy particles, like the Higgs. My understanding is that the high velocities make the particles more massive, allowing them to produce higher mass particles (relativity). So... If I fly past...
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    Do we know its a Higgs?

    Is there any possibility that CERN has discovered a particle that appears like a Higgs, but simply could be some other particle that has a different function?
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    Temperature of CMBR compared to galaxies in general

    I'm curious about how the temperature of the CMBR compares to the light and temperature of galaxies in general. Basically, I'm wondering how 'hot' are galaxies and how do they contribute to the CMBR readings. Does the temperature of galaxies compare on some scale? Do we have to account for...
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    Alan Guth, Gravitationally repulsive material?

    Does anyone have any resources which explain the nature of Alan Guth's 'gravitationally repulsive material'? I would like to understand a basic explanation of how this material becomes a negative pressure at extremely high temperatures. I understand that this arises from GR and the standard...
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    Regarding graviton and negative energy

    Hi. I recently listened to a lecture by Alan Guth, speaking about cosmological inflation. He made the statement that the energy of a gravitational field is negative (followed by a great thought experiment with a collapsing shell of matter to demonstrate this). I am curious; does this mean that...
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    Comparable size of the observable universe immediately after inflation

    Regarding scale. How big was the region of the universe we now understand to be the observable universe, immediately after early inflation? I'm tyring to understand the scale. I know our sphere of observation is very approximately 45 billion light years or something, I don't know for sure...
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    Early cosmic inflation and the expansion of the universe.

    My question is regarding the early inflationary phase of the Big Bang. As I understand it, inflation is what gave rise to the expansion energy of the universe. Meaning, inflation gave the 'push' so to speak that set the everything moving apart. This makes sense because obviously the universe...
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    Stargazing Will the James Webb telescope see past the big bang?

    Will the James Webb telescope be able to see beyond the Big Bang in principal? I realize, in reality this is not possible, but I'm curious if it will see as far back as possible, or if the telescope has limits, and eventually we will need a better telescope to truly look deep. Thanks!
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