What is Physical: Definition and 1000 Discussions

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. D

    Physical optics -- counting interfence fringes to measure a length change

  2. P

    The key to unifying the theories of the very large and the very small

    Summary: The key to unifying the theories of the very large and the very small is asking if the object in question is physical Uncollapsed(stateless | unphysical) Quantum Waves + State(Matter Field or wave collapse) = Physical Matter Is a Matter Field state change the same thing as wave...
  3. amjad-sh

    I Physical meaning of ##\psi_1(x)\hat{A}\psi_2(x)##

    What is the physical meaning of ##\psi_1(x)\hat{A}\psi_2(x)##, where ##\hat{A}## is an observable and, ##\psi_1(x)## and ##\psi_2(x)## are arbitrary wavefunctions?
  4. maajdl

    A Canonical quantization of Electrodynamics: physical intuition ?

    Hello, I am freshly retired and enjoy going back to the fundamentals. I followed the wonderful courses by Alain Aspect on Coursera on Quantum Optics 1 and 2 . The quantization of Electrodynamics is really easy stuff. Just follow the correspondence between Poisson brakets and Commutators ... and...
  5. Bobjoesmith

    I Physical Meaning of a Quantum Field

    Sorry in advance if this question doesn't make sense. Anyway, I am reading a paper about quantum field theory and the Whitman Axioms (http://users.ox.ac.uk/~mert2060/GeomQuant/Wightman-Axioms.pdf), and it describes a field (Ψ) as Ψ:𝑀→𝑉⊗End(𝐷) where 𝑀 is a spacetime manifold, 𝑉 is a vector...
  6. Y

    I Physical model of the roulette wheel

    Hello, I am having trouble understanding the two friction force terms from the ball rolling on page 4 of this physical model: http://www.dewtronics.com/tutorials/roulette/documents/Roulette_Physik.pdf What is the reason for the cos\theta term ? I think the frame of reference is made up of the...
  7. B

    I What is the physical meaning of <p>?

    Here's my understanding. Please let me know what I'm missing or what I've misunderstood. <x> represents the average of position measurements on some N, identically prepared particles. If those measurements are thought of as a distribution, then that distribution's form should match the wave...
  8. Jamister

    Quantum Where Can I Find Rigorous Books on Physical Chemistry for Master's Level Study?

    I'm master physics student looking for books in physical chemistry for stuff like born Oppenheimer Approximation and more. Most books give hand-waving proofs and I'm looking for a book which is more rigorous. Thanks
  9. S

    Could MWI create universes with fundamentally different physical laws?

    Summary: Could MWI (Many Worlds Interpretation) create universes with fundamentally different physical laws? Physicist John Wheeler proposed along with Hugh Everett and Bryce DeWitt the 'Many Worlds' Interpretation of Quantum Mechanics (although he expressed some doubts about its validity) I...
  10. S

    B Might all physical quantities be quantized?

    Please take a look at my first thought experiment: You have 2 coins to place on the table. The distance between them may be between 0 (inclusive) and 1 meter (exclusive). So if you want to store the number 15 you simply set the distance to 0,15m. You can later read the information by measuring...
  11. M

    Logical model of the physical world

    Hi, are there any attempts to make a machine readable definition of most common rules and actions (or a causal model) of physical world? I'm looking more a logical level of modelling, at the same level that human common sense works. I have some experience on semantic tecnologies and ontologies...
  12. W

    Loading OS into a VMWare Machine from a Physical Machine

    Hi All, I have VMWare Workstation Software to use VMs . When I create a machine I am asked to load an OS into the new VM: Is it possible to load the Physical PCs OS into the VM:
  13. Logic Cloud

    I 'Formulations' of Physical Theories: Overview?

    I'm trying to understand the various different ways in which we can 'formulate' theories in physics and I am finding it somewhat hard to obtain a bird's-eye view. I hope someone here can help clear up some ambiguities. I apologize in advance for the 'sketchy' ways I put matters in my...
  14. F

    I Big Bang and physical constants

    Were the universal physical constants already in place at the instant of the BB? Things like Planck's constant, the speed of light, the various mass of particles, the various force values. Was it possible that the early universe ( the first couple of billionths of a second or so) existed without...
  15. S

    Physical explanation of eye contact

    Is it not fascinating that you can feel eye contact on such distances we do? What is it that we actually detect? I understand that the eye absorb light, it may be the starting point for the explanation?
  16. H

    I Exploring Physical Connections 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...
  17. R

    I What physical mechanisms are involved in heating planetary bodies?

    Many asteroids and planets have undergone enough heating so that they were at some point completely or partially melted. What physical mechanisms are in play here? I'm assuming a solar system such as our own. Thanks!
  18. Flying_Dutchman

    I Physical meaning of the equation E = - del V

    The gradient of a function gives a vector perpendicular to it's surface. So the equation reads electric field is the negative of the vector perpendicular to the equipotential surface. I know electric field and understand potential but I can't physically make sense for the above sentence how LHS...
  19. fluidistic

    A Exploring Cooper Pairs & Superconductivity: Physical Evidence?

    I am wondering what is the physical evidence that Cooper pairs are indeed the ones responsible for superconductivity. These pairs consist of two electrons with opposite momentum, forming a boson with null momentum. But what about pairs that would consist of, say, 6 electrons (or even more)? Of...
  20. cnh1995

    Physical Significance of the Laplace Transform

    I have used Laplace transform during my EE studies to solve differential equations and in control system analysis, but we were taught that as a tool kit to make the math easier. The physical meaning was never explained. I know basic time and frequency domain concepts (thanks to Fourier series)...
  21. A

    B Is there any physical quantity having two different units?

    Is there any physical quantity having two different units or can it be possible that a physical quantity have two different units?
  22. IzitoI

    Physical units problem for a DC Motor with viscous friction

    Hi everyone, I'm trying to derive DC motor differential equations. I have some doubts: I have a viscous friction coefficient in terms of N*m*s. Is it possible to express it in terms of N*m*s/rad? And how? Some exercises show this value in Newton-meter-second and others in...
  23. T

    I Compute Physical Coordinates of an Event in a Curved Spacetime

    Hi everyone, this is my first post on PhysicsForums. Thank you so much in advance for your help! My question is the following. Let us suppose we have an event A in a curved spacetime which, for definiteness, is the spacetime curved by the bodies of the solar system. Adopting a coordinate system...
  24. I

    Physical interpretation of this integral equation involving distance and time?

    I am able to solve the problem however if x was position and t was time how is this problem interpreted? I know, for example that ##\frac{dx}{dt}## tells us how the position of something changes as time changes (or instantaneous change) and an integral gives a net change so to speak.
  25. D

    Programs Diploma thesis - Neural Network Application in Physical Problems

    Hello everybody. I am currently on my last year of Computational Physics education. More and more I am interested in Machine Learning and Neural Network. Time has come for me to choose diploma work thesis, so I am searching for interesting ideas where I can merge my interest in neural networks...
  26. P

    Is DSL multiplexed at the remote concentrator box or at the CO?

    I have a couple of basic questions/statements which I'm not sure about because I can't find a simple and comprehensive description of some of the basic stuff regarding the physical layer. (I've read the relevant chapters in a couple books like Tanenbaum's, and Kurose & Ross's one, but I couldn't...
  27. L

    Help Drawing a Quaternary Deposits' Profile in Uppland, Sweden

    <mentor: moved to homework forums - no template okay in this case> Please I need help with this one! Drawing a Quaternary deposits’ profile The purpose with this practical is to understand how a map showing Quaternary accumulations is built up and how it may be interpreted. The information is...
  28. Abhishek11235

    A Physical meaning of Noether's theorem

    This is the image of theorem from V.I Arnold's Mathematical method of mechanics. I understood the example given in text. But I want to know what is physical meaning of example? Can anybody help?
  29. Buckethead

    B Presentation of mass as a physical quantity

    I have started hosting a "scence open mic" and the first one last month was very successful so I'm doing it again. We had about 30 people show up and 5 presenters including myself giving up to an 18 minute talk on anything science. It was a great experience and I encourage others to try it in...
  30. Kevin Chieppo

    B Exploring QM: Is Uncertainty a Physical or Measurable Limitation?

    I'm a hobbyist physicist and I just started studying QM through watching Leonard Susskind's lectures on the Stanford Youtube channel. I get the idea of it being impossible to precisely know both a subatomic particle's position and momentum, but is this actually a physical limitation? Or is it...
  31. S

    B Are trigonometric ratios physical quantities?

    I already know the fact that angles are physical quantities, but sin, cos of some angles are quantities? Quantities are those things, which can be quantified, are sin, cos, tan be quantified through measurement, if yes then other mathematical functions should also be categorised as physical...
  32. A

    B Why are we trying to unify all the physical forces?

    I've been reading a book called hyperspace by D.R Michio Kaku. In this book he talks about unifying all the fundamental forces of nature (gravity , electromagnetic force , weak and strong nuclear forces.) My question is, what if they are not unified and we are just trying in vain. I don't...
  33. A

    Spring constants from the physical dimensions of a spring

    I’d like to know if anyone has formulas for calculating the spring constant (k) of coil springs, from their physical dimensions. I bought a coil spring, suspended a 0.6 kg mass to it, observed its oscillation period at very close to 0.6 seconds, and so believed the spring constant “k” to be...
  34. Hawkingo

    I What is the physical meaning of divergence?

    I want to visualize the concept of divergence of a vector field.I also have searched the web.Some says it is 1.the amount of flux per unit volume in a region around some point 2.Divergence of vector quantity indicates how much the vector spreads out from the certain point.(is a...
  35. R

    I Physical interpretation of a plasma (Te, Tv, Tr)

    I'm trying to understand the physical implications of electron temperature (Te), vibrational temperature (Tv), rotational temperature (Tr) and translational temperature (To) of a plasma. I am reading often that Te > Tv > Tr ≃To, in terms of what is happening inside the plasma what does this...
  36. YoungPhysicist

    Physical representation of bead sort

    Bead sort is a not practical sorting algorithm that suppose to have a time complexity of ##O(\sqrt{n})##in the real world. I thought it would be great if a device that can take numbers from the computer,then turn it into analog stuff that the device can read,drop the beads,and return it...
  37. J

    Fortran Physical time (years) in simulations

    Hello My name is Joseph I am a physics student, I am new to Fortran, I know how to write a code for solving differential equations, but now I have a physics equation for evolving star rotation as a function of mass. and I do not know how to evolve (using any numerical method, such as Euler) so...
  38. R

    I Are there proposed physical processes for superposition

    I’m understanding that QM superposition in which, for example, a single electron acts as a wave in a double slit experiment and interferes with itself by passing through both slits simultaneously (when there are no detecting devices priorly measuring either slit) presents a result which is...
  39. L

    I Do we have to accept the physical existence of time?

    So, I am confused about the following.I learned in high school and in my first year of university that there is something called time dilation that observers observe that time is slower for objects that are moving faster. As in if there were two initially synchronized clocks that you could...
  40. S

    A Physical significance of growth rate in plasma

    Let us say that we have a dispersion relation curve and associated instability curve as shown below for a magnetised plasma, which have been formulated through kinetic theory. The frequencies and growth rate have been normalized w.r.t. cyclotron frequency of proton. My question is: what does...
  41. cianfa72

    Potential Energy for "stone + field" physical system

    Consider the classical scenario a stone falling in the Earth gravitational field. Classically we attach a Potential Energy to the stone and using the law of conservation of (mechanical) energy we are able to evaluate the dynamic of the falling stone. This model assume a stone in a "external"...
  42. FallenApple

    Medical Masculine physical features correlated with cortisol protection?

    There has been studies showing that high testosterone protects against cortisol. Is that why there's also a correlation between height and income? Because extremely competitive high level jobs would easily destroy a normal person's health unless they have high testosterone to protect against...
  43. T

    The physical concepts in the double jump of the video games

    Hi friends, I'm just thinking, in some video games, the characters have a double jump mechanical. What's the physics concepts behind this? I mean, it's really possible explain it? I saw a brazilian video about science in games in which the author talks about air resistance. It's a curious...
  44. H

    B The physical properties of diamonds: no melting point?

    I had heard an opinion from my high school teacher, but I can't understand?? "An experimental record of a French scientist. He heats the diamond and sublimates it. After cooling, it turns back to solid barbecue carbon. In this case, although there is a physical transition, the substance seems...
  45. danielFiuza

    A Solution?: Quintic Equation from Physical System

    First time in this forum, so greetings to everyone! I am currently working with some physical models in the field of natural ventilation and I came across the following 5th order polynomial equation (quintic function): $X^{5}+ C X - C =0$ This is the steady state solution of a physical system...
  46. F

    I Normalized source function: physical interpretation

    Hello, In physical radiative processes, I am studying the solution of the following equation : ##S=(1-\epsilon) J + \epsilon B## with : 1) S the source function 2) J the mean intensity ( ##J=\dfrac{1}{2}\int_{-1}^{1} I_{\nu}\text{d}\tau_{\nu}##) 3) B the Boltzmann distribution 4)...
  47. AchillesWrathfulLove

    Are there scientific studies for physical superiority?

    Is there scientific studies that confirm that a race or ethnic group is physically superior to any other? I think we can examine sports records can make some judgement on what type of groups of people are superior in each type of sports. But I don't know how you would go about judging who is...
  48. HEPlover

    A Are valence quarks real physical entities?

    Im carefully studying Deep Inelastic Scattering and I have the doubt if valence quarks are real physical entities or if they are just a way we can think hadrons are built. I understand that inside hadron we have the Parton Distribution Functions that say that there are an infinite number of...
  49. Jazzyrohan

    I What is the physical cause behind time dilation?

    Time dilation can be shown mathematically but what is the physical phenomenon due to which it occurs?
  50. T

    How Do Microwave transmitters work without physical connections?

    So I recently picked up 40 of 10.525 GHz Microwave RADAR transmitters: I opened up one out of curiosity and had something like this (image attached) . I noticed some parts of the PCB aren't even connected to anything. How do the different shapes and sizes of the PCB interact with each-other...
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