Physical Definition and 1000 Threads

Physical therapy (PT), also known as physiotherapy, is one of the healthcare professions. Physical therapy is provided by physical therapists who promote, maintain, or restore health through physical examination, diagnosis, prognosis, patient education, physical intervention, rehabilitation, disease prevention and health promotion. Physical therapists are known as physiotherapists in many countries.
In addition to clinical practice, other aspects of physical therapist practice include research, education, consultation, and health administration. Physical therapy is provided as a primary care treatment or alongside, or in conjunction with, other medical services. In some jurisdictions, such as the United Kingdom, physical therapists have the authority to prescribe medication.

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  1. A

    B Can any physical quantity be vectorless?

    Go easy on me please as I am just delving into the world of physics and the likes :D I may have this completely misunderstood, so bear with me and correct me where I'm wrong please. There are 2 types of currents, DC and AC. Correct? AC stands for Alternating Current and DC stands for Direct...
  2. Wrichik Basu

    B Physical significance of wave function

    I am a beginner in quantum mechanics. I started out with D. J. Griffiths' book in quantum mechanics. I'm having a problem in understanding the wave function. What is the physical meaning of the wave function? I searched on the net but didn't get any good explanation. I understand that the...
  3. SchroedingersLion

    I Mixed states vs pure states - physical POV

    Hey guys, I am having issues with understanding the physical nature of pure and mixed states. Maybe you can help me out? 1) A pure state - superposition is a state that consists of different states at the same time. It's like having several waves, each one belonging to an Eigenstate of the...
  4. C

    How can I connect a speaker to my amp without a physical wires

    I am trying to connect a second pair of speakers to my amp without the use of wires. It is really only one speaker position where running wires is impractical.
  5. G

    What Determines Voltage Reference and Measurement Accuracy?

    An example of how trying to teach someone exposes gaps in your knowledge: I was talking to someone about why we have line, neutral and Earth conductors. We got on to the fact that the Earth is an enormous sink and source of charge, so anything referenced to it can be considered 0 volts. Then...
  6. bachir1994

    The physical meaning of electric potential

    I read that : An electric potential (also called the electric field potential or the electrostatic potential) is the amount of work needed to move a unit positive charge from a reference point to a specific point inside the field without producing any acceleration. Typically, the reference point...
  7. davidge

    B Conservation of Newtonian Force and the Invariance of Maxwell's Equations

    The electromagnetic wave equation being of the same form in all intertial frames is because Newton's force is a vector quantity? I mean, if the wave equation changes its form from a intertial frame to another one, would the electromagnetic force be different in the two frames? I know that one...
  8. C

    I Why does physical space have to be three-dimensional?

    There's a question that's been in my mind for quite a while but I cannot figure out what the answer is. I't probably an ill posed question but I will ask it anyway: 1.- Do we know what the dark-matter statistical distribution in our Universe is (at large scales)? 2.- In case we do, could...
  9. D

    The physical meaning of a slope

    Homework Statement Yesterday, our physics class had a laboratory examination, in which we used a protractor as a "weight". We hung some paperclips and checked the angle. Then, they asked about the physical meaning of the slope of the graph: tan( angle) as a function of n( number of...
  10. D

    Physical details of the operation of galvanic cells

    I'm trying to understand the physical details of the mechanism, by which galvanic cells work, instead of more abstract descriptions of the half reactions that take place and I find it hard to piece together concrete information on this. Below is a description of my basic understanding of the...
  11. K

    Simple Harmonic Motion/Period of a Physical Pendulum

    I'm studying the motion of a physical pendulum, could someone help me make the final step in figuring out how to find the period so I can make predictions before carrying out a practical? Basically I have a meter rule with holes drilled along the length and will be pivoting it at various points...
  12. F

    Physical degrees of freedom of an Electromagnetic field

    As I understand it, the classical source-free electric, ##\mathbf{E}## and magnetic, ##\mathbf{B}## wave equations are solved by solutions for the electric and magnetic fields of the following form: $$\mathbf{E}=\mathbf{E}_{0}e^{i (\mathbf{k}\cdot\mathbf{x}-\omega t)}$$...
  13. H

    I Is Time Reversibility Inherent in All Physical Laws?

    What does it mean for the laws of physics to be reversible in time? Does it mean that for every possible physical process, the same process can happen as it would do if we "played the tape backwards" so to speak? If a particle follows a path due to some physical law, Does it mean that if we were...
  14. H

    I Linear and nonlinear physical theories

    Classical physics is a nonlinear theory, but how is it that? Why is it nonlinear? Also quantum mechanics is a linear theory so that the sum of the solutions of the schrödinger equation is itself a solution. But I'm not sure I grasp this completely. Why is quantum mechanics linear while...
  15. Maxwell's Demon

    A What’s the physical nature of the pilot wave?

    Within the context of the de Broglie-Bohm pilot-wave theory, can anyone explain what the pilot wave is in physical terms? I’m having a hard time understanding how, for example, the pilot wave influences the trajectory of a photon in the double-slit experiment. Are we dealing with...
  16. W

    QP: Physical Meaning of Orthogonality

    Homework Statement I have recently come across the notation <ψ|Φ> in my notes and am not quite sure what it means. Some articles I have read online state that this is analogous to the dot product, except that this is the "dot-product" of 2 wave-functions. Would I then be right in saying that...
  17. LarryS

    I Is the Phase Velocity of a Massive Particle Representing Anything Physical?

    Given a massive particle traveling freely. Also assume that it is in a momentum eigenstate - a pure unmodulated sine wave in position space. In non-relativistic quantum mechanics, the phase velocity for that particle would be greater than the velocity of light. Does the phase velocity for...
  18. K

    B Why are some random physical quantitites given a name?

    ##\frac{dp}{dt}## is given the name 'force' but ##\frac{dp}{ds}## has no name. I know 'force' is useful for calculations and predicting the future of the system. If 'convenience in calculations' is the reason why some quantities are given names, then I don't see why ##\frac{dp}{ds}## doesn't...
  19. S

    A Why the physical meaning of the quantum Hall effect is important

    I have read some paper about transport measurement of graphene. From classical hall effect, we can get some information about kind of charge carrier, charge density etc. So, it is important for understanding matter. But, I don`t know why quantum hall effect is important in graphene transport...
  20. C

    I What is the physical meaning "without spin-orbit interaction

    Hello. I have studied about DWBA (distorted wave born approximation). But, I do not know the physical meaning of "DWBA without spin-orbit interaction". I think, I can not understand about meaning of spin-orbit. How can I understand "without spin-orbit intertaction". Thanks.
  21. shea

    A Physical Understanding of Kirchhoff's Laws

    < Mentor Note -- thread moved to the EE forum from the Homework forums since it is a more general set of questions > So, we are going into Kirchhoff's Laws in class, and my entire understanding of circuits, which took me a while to form, is again falling apart. A physical understanding is...
  22. D

    I Fields: Unobservable, Yet Physical?

    I'm currently working through Robert Klauber's Student Friendly Quantum Field Theory, which by the way is much more accessible than other texts like, say, Peskin and Schroeder, for others also coming into QFT via the self-study path. Anyhow, he mentioned something that never really clicked...
  23. N

    I Physical significance of a.σ in expectation -E(a.σ b.σ)?

    Admins: Please excuse my E and brackets in the title, and correct if possible. My questions are these, please: 1. What is the physical significance of (\hat{a}\cdot\boldsymbol{\sigma}_{1}) in \left\langle...
  24. S

    Physical meaning of geometrical proposition

    Is it true that one straight line goes through only 2 points?? If no then how ?? If yes then why??
  25. N

    I Physical properties of a particle in Bohmian mechanics

    Are the physical properties of a particle spread out through the wave function in bohmian mechanics? This is from wikipedia "Also, unlike in classical mechanics, physical properties (e.g., mass, charge) are spread out over the wavefunction in de Broglie–Bohm theory, not localized at the position...
  26. C

    Negative Free Energy - Physical Chemistry

    Homework Statement Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Given the ΔG°rxn values for each reaction, which method (reaction 1 or 2) requires less energy under standard...
  27. FallenApple

    Quantifying the effects of physical exercise on cognition

    We all know that there's plenty of evidence showing that exercise does benefit cognition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3951958/ The real question is how can I actually use this in practice to get real world results. So if I spend 8 hours a day studying a certain subject/trade...
  28. Andy_K

    I Is Time Merely the Progression of Energy Toward Equilibrium?

    Can we say that TIME is essentially the progression of energy from one state to another, in its long cosmic quest to achieve equilibrium? Without the movement of electromagnetic waves and transfer of energy, the entire universe would come to a standstill — an inanimate, “frozen” world. Time...
  29. N

    I What is the physical significance of Bell's math?

    Bell (1964) http://cds.cern.ch/record/111654/files/vol1p195-200_001.pdf has 3 unnumbered equations following his equation (14). Let them be (14a)-(14c). Bell then uses his equation (1) to move from (14a)-(14b). It seems to me that he uses this: [A(b,λ)]2 = 1. (X)...
  30. Avatrin

    Physical properties of materials in the human body

    I am looking for resources on the physical properties of the various components that make up the human body. As an example of what I am looking for; If we look at the finger, we know it has bones, skins, nails, blood etc. What are the various physical properties of these different parts...
  31. D

    I Physical Dimensions of electron shells

    I want to model atoms of the periodic table using OpenGL (API for 3D graphics). I was told by a physics teacher one time that this cannot be done because it's not solvable. Can you guys confirm? Apparently only the shells of the hydrogen atom has been solved meaning that I can only model the...
  32. L

    Physical requirements for Mars travelers

    In addition to being intelligent and possessing important skills, are there any specific height and weight requirements for Mars astronauts? For example, a neighbor on my street would like to become an astronaut. However, he weighs approximately 300 pounds.
  33. IoFawkes

    Calculate Work (w) for Isothermal Gas Expansion/Compression

    Homework Statement Calculate Work(w) when 6.5L of an ideal gas at an initial pressure of 34.3atm is expanded or compressed isothermally to a final volume of 34.3L reversibly. Answer in J Homework Equations PV=nRT P1V1=P2V2 w=-nRT In(V2/V1) The Attempt at a Solution Using w=-nRT In(V2/V1) I'm...
  34. ReidMerrill

    Physical chemistry: Energy operator and eigenfunction

    Homework Statement The energy operator for a time-dependent system is iħ d/dt. A possible eigenfunction for the system is Ψ(x,y,z,t)=ψ(x,y,z)e-2πiEt/h Show that the probability density is independent of time Homework Equations ĤΨn(x) = EnΨn The Attempt at a Solution [/B] I understand the...
  35. wolram

    Physical condition for the slowing down of cosmic acceleration

    I find it beyond me to understand all of this paper, only that cosmic acceleration is not slowing down, which is IRC against a lot theories. Bouncing universe for one, and a guaranteed heat death. That is if the U does not slow in the near future. https://arxiv.org/abs/1701.04973 The possible...
  36. A

    I Lorentz violation and the physical vacuum....

    Posting as this was buried in another thread - If Lorentz invariance is broken in, e.g., whatever theory of quantum gravity turns out to be correct, what effect would this have (if one can speculate) on the physical vacuum? That is, for two observers, let's say, moving at different, constant...
  37. A

    A Physical meaning of open set on manifold

    I understand the definition of continuity on a manifold based on open sets. I was questionning myself about what is the corresponding physical meaning of an open set of a manifold (M, Power-set-of-M, Atlas). Is it a simple (maybe simplest) assumption in order to define mathematically continuity...
  38. F

    I Do these relations have any physical significance

    Photon energy E_p= hv=hc/lamda taking lamda= h/mc which is the electron Compton wavelength and substituting in above E_p=mc^2 L(angular momentum)=r X P=(Lamda/2)*(E_p/c)=h/2 are these results coincident or have any physical meaning, they relate a photon wavelength equal to an electron...
  39. Chris Miller

    B How can a physical entity be infinite?

    Just googled, "Is the universe infinite?" and got this: "The surface of the torus is spatially flat, like the piece of paper, but finite. However, with expansion, it is possible that even if the universe just has a very large volume now, it will reach infinite volume in the infinite future."...
  40. V

    Physical interpretation of the "total potential energy"

    The principle of minimum total potential energy is frequently used in solid mechanics as an elegant way of deriving the equilibrium equations for an elastic body under conservative forces. This method states that out of all the possible displacement fields that fulfill the boundary conditions...
  41. arupel

    B Time: Physical Existence or Perception? Current Opinions

    I cannot conceive of time as an actual physical existence. What are the current opinions on what time is?
  42. A

    Temperature physical or chemical change

    If you Increase or decrease temperature and change states of matter, that's a physical change. But are there any circumstances where temperature can cause a chemical change? Like if increasing temperature could break the bonds between the atoms and separate them? And I don't mean a combustion...
  43. adsorption

    I Anyone knows V-Sorb 2800 BET surface area analyzer principle

    we interest one V-Sorb 2800 BET surface area analyzer, using physical adsorption principle to test particles surface area data, if anyone knows this analyzer principle?
  44. S

    I Physical significance of nodes?

    Hi, II have an issue with nodes in QM, like suppose in a well, the number of nodes depend on (n-1), the thing is that, what is so special(physically) about the point that the particle cannot be located there? Thanks is advance
  45. Battlemage!

    I Permeability/Permittivity: Any physical significance?

    I have had some issues understanding this topic. On two occasions Dale has pointed out to me that they are not really based on physical things, given that their values are completely arbitrarily defined for the purpose of matching certain measurable or defined things, like the ampere and the...
  46. T

    B What is a good physical reference for microstrain?

    I can say that the distance between my knuckle and my finger joint is 1~ inch, that a baseball weighs ~1 lb, and ~60 joules is the feeling of dropping a bowling ball on your foot. I'd like to understand strain in this way, can anyone offer a common place reference? Also, I know strain is...
  47. S

    A Physical interpretation of Pauli-Lubanski pseudo-vector

    ##P^{\mu}## generates translations and extracts the four-momentum of a particle when it acts on the momentum eigenstate of a particle. ##J^{\mu\nu}## generates rotations and measures the spin angular momentum along the ##i##-direction of a particle when it acts on the ##i##-th direction spin...
  48. M

    Use of solid materials as medium for data transfer

    Really odd question for you guys but I'm curious about your input, and apologies if it's a foolish question to ask anyway(I'm a CS student and this came up in a discussion with a classmate of mine). So I know this is a fairly odd thought and not likely practical in any real world scenario, but...
  49. D

    Can a wave of light activate a force on a physical object?

    Hello, A professor once told me that light can really do it. Is anyone knows about the phenomenon , and can explain me about it?
  50. strangerep

    A Physical Relevance of Singularity Theorems?

    I've been reading this recent review paper by Senovilla & Garfinkle on The 1965 Penrose singularity theorem. In sect 8.3 (p38): Their eqn(6) is on p8: ##R_{\rho\nu} u^\rho u^\nu ~\ge~ 0 ~.## The message I take away from this is that much of the theory about singularity theorems has turned out...
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