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Physics

The world of forces, particles and high-powered experiments.

  1. Started by spadille,

    can we get a commercial compound microscope that does not invert the image upside down??

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  2. Started by mississippichem,

    So in my work I've had the pleasure of utilizing the Kramers-Kronig relations numerically to help solve certain problems. I understand the basics of how they are applied and their relationship to response functions. I'm looking for a deeper understanding in the general sense, both in the mathematics and some of the fundamental physics behind their application. If anyone is aware of any resources (review articles, textbooks, pdf's etc.) that could aid me in my plight I would be very grateful. Feel free to give materials that review this from either a mathematics, physics, or applied spectroscopy vantage point. I don't really care. I'm just very interested and want…

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  3. Started by URAIN,

    What is the charge ? What is its property? Is mass and charge relative? (Means mass must has charge and charge must has some mass)

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  4. Started by Jim007,

    Its actually a crossword puzzle related to physics. http://pastehtml.com/view/bo1b8dmit.html Here's what I have done. Not sure if all the words that I entered are correct or not. here's the partially completed, changed a few words which were possibly wrong. But still the word Diversion doesn't fit.

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  5. ... we must first understand exactly what hyperspace is, where it resides relative to matter space and how it functions within the universe. I'm of the opinion that we will only be locked within the confines of chronology protection if we lock ourselves to only understanding material space. Hyperspace generally refers to Kaluza-Klein's 80 year old concept that there is a dimension of existence that takes up the values between "photonic speed matter" thus it involves faster moving particles. What if it is also complimented by a "hypospace" where all moves slower; the tachyon only combining to form the present through sympathetically interfacing with the tardyon?

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  6. Started by Appolinaria,

    If the fourth dimension is spacetime, is any 3D object that moves through time, now a 4D object?

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  7. Started by max13,

    Have you seen the movie 'top gun', in it there is a incredible fighter aircraft F-14 tom cat. Its flight is like a boeing airbus thrust?

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  8. Started by ABCD1234pop,

    300,000Km/s ? Why isn't it some other number?

  9. Started by khaled,

    I was reading about "Quantum Entanglement" .. and one explanation was saying that if we have two dices that are quantum entangled, if we roll one for N times and it result in N ordered outcomes, if we roll the other N times, we will get the exact same outcomes ... Not only I'm shocked by that example, but also confused .. my question is simple: what is quantum entanglement exactly ?

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  10. Started by AliceLFC,

    yeah, im fascinated by the possibilities of there being black holes and worm holes up there somewhere and im intrueged by what would happen if something went into one :L i attended a 'science live' day in birmingham and we spoke about it quite a bit there. but could anyone go into more detail and explain to me more about black holes and worm holes?

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  11. Started by newts,

    I have had difficulty finding webpages that accurately describe the tide-raising force, and that show how to calculate it. So I have now produced my own. http://squishtheory.wordpress.com/the-tides/?preview=true&preview_id=210&preview_nonce=69cba02793 I show how to calculate the tide-raising force, both by differential gravity, and also by the difference between centrifugal forces and gravitational potentials. Once I had figured out exactly what needed to be calculated, the maths was quite straightforward. It would be helpful if anybody who has struggled with the concept of the tides, would like to tell me if my explanations are sufficiently clear; and al…

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  12. Started by rktpro,

    My book says r^3/t^2 was found constant by Kepler. What this constant is called? How is acceleration equal to v^2/r in case of circular motion? Why is rate of change of momentum or say product of mass and acceleration equal to force? Why not was it ma^2? How was it proved that it is equal to ma? How newton showed that a spherical body of uniform density behaves as if whole of its mass is concentrated at its center? Also, why is it that a symmetrical body of perfect density balances about the point of center of gravity? What are the latest and advanced means to calculate the value of acceleration due to gravity? How do we estimate mass of a double star? These questions…

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  13. Started by acewert,

    Hello! I have a problem, but since this isn't for school I figured I wouldn't put it in the homework section. Okay, so here it is: I need to calculate the resultant temperature of two bodies of water mixed together. The issue is that this is not a classic mixing two liquids in a beaker scenario. The complication is that the two bodies of water are the bottom of a reservoir and an input pipe. Because this is an open system, any water added by the input pipe will mix with the bottom of the lake (and yes, only the bottom because we need to maintain the natural stratification of the lake) without changing the volume of the lake because any water added to the syste…

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  14. Started by dodobrown,

    [THE ULTIMATE UFO SCHEMATIC] VERSION #1 OF (X) COMPONENTS: - VERTICAL BUOYANCY SYSTEM - HORIZONTAL PROPULSION SYSTEM - SYSTEMS TO NEGATE G-FORCES - SYSTEMS TO NEGATE AERODYNAMIC DRAG 1.VERTICAL BUOYANCY SYSTEM PURPOSE: To ascend vertically. To ascend vertically you can use conventional propulsion techniques , such as using explosive materials , or physical applying a force to the air directly around you creating lift. In this case we'll be using a more unconventional technique , which utilizes earths magnetic field , as the medium for creating vertical lift. Earths magnetic field is , as its name states , just a magnetic field .…

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  15. Started by searchingfortruth,

    If matter controls time (the denser the matter the slower time passes) does that mean if we could create an area in space that had no matter effects such as gravity at all that time would rush forward?

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  16. Started by Mr K,

    I need better Understanding of Diffraction. Also I would to understand this diagram

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  17. Started by URAIN,

    I would like to know answers from science, to these following questions. Please answer What is the time? Which observe the time passing? Who experience the time passing?

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  18. Started by michel123456,

    This is a question: Is it possible, starting from a geometric description that uses only proportionality, to construct a system that ends up with some kind of unit, like kilogram, meter, second or ampere? Intuitively, I would say no.

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  19. If everything is energy and different types of energy react to each other, then why couldn't telepathy and telekinesis be possible?

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  20. Started by ABCD1234pop,

    Would things stop moving if the universe stopped expanding? And does the universe accelerate at the same rate in its expansion everywhere? Thank you.

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  21. Neutrinos only interact Weakly. Er go, neutrinos are generated into Weak eigenstates, which are "mixtures" of the canonical mass eigenstates; and neutrinos remain in those Weak eigenstates, until detection. For example, electron neutrinos [math]\nu_e[/math] are a mixed Weak eigenstate, representing a mixture of the neutrino mass eigenstates [math]\nu_1, \nu_2, \nu_3[/math], specifically [math]|\nu_e> \approx 0.9 |\nu_1> + 0.5 |\nu_2>[/math] The following analysis employs normalized units [math]c \rightarrow 1[/math]; and assumes that the neutrino mass eigenstates, are also eigenstates, of mass [math]\left( \hat{m} \right)[/math], momentum [math]\left(…

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  22. Having just conducted a experiment in which I levitated a small neodymium magnet above a liquid nitrogen cooled YCBO superconductor, I was wondering if anyone knew of any factors that affect the height at which the magnet levitates at (e.g does magnet strength affect it?), and whether this applies inversely (i.e does a stronger magnet allow a superconductor to levitate higher above it?). In addition, I was wondering whether anyone could think up an inexpensive (under £100, ($~170)) way to keep liquid nitrogen above the superconductor, which is 1" in diameter, in order that it remains at its critical temperature. I had thought of a half ping-pong ball and have yet to try t…

  23. Started by Perpetual Motion,

    The most coveted prize in particle physics - the Higgs boson - may have been glimpsed, say researchers reporting at the Large Hadron Collider (LHC) in Geneva. They need more evidence to claim a discovery. Sources:http://www.bbc.co.uk/news/science-environment-16158374 http://richarddawkins.net/articles/644214-lhc-higgs-boson-may-have-been-glimpsed

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  24. Started by Gozzer101,

    As I have learnt it's very difficult to be a stationary observer in space. However we often talk about speeds of certain objects. For example: The Earth rotates at 1600 km/hour The Earth rotates the Sun at around 107000 km/h The Sun/Solar system moves in a patch of stars at around 70000km/h We orbit the Centre of the milkyway at around 792000 km/h We are moving as part of a cluster of galaxies at around 2000000 km/h Although all these speeds are in different directions it still has to be a "speed" We measure light to be a speed of 670000000 km/h As the law of physics if something speeds up, time slows down. That is why light is the speed limit of our …

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  25. Started by keep_talking,

    Studies show the Andromeda galaxy is on a collision course with the Milky Way. Estimations are that in about 3-5 billion years, the galaxies will intertwine, and completely destroy each other. This does not bode well for humanity. Hell, its been said that we have front row seats to our own destruction. Personally, I would give almost anything to witness this first hand, but its just not going to happen, and personally, I don't want to live that long. I have also read that in fact, the combining of the galaxies will go un-noticed due to the vast distances contained within the galaxies. Stars and planets will not collide, merely pass by eachother unharmed. Mumbo jumbo? …

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