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

    Physical meaning of wavefunction parameters x and t

    This isn't a homework question per se but it's a question that I had while reading through my textbook so I think it's appropriate here. I just started studying Quantum Mechanics and so am getting familiarized with the meaning of wave functions and their behavior. One question I can't seem to...
  2. A

    Physical Interpretation of point transformation invariance of the Lagrangian

    Homework Statement The problem asked us to show that the Euler-Lagrange's equations are invariant under a point transformation q_{i}=q_{i}(s_{1},...,s_{n},t), i=1...n. Give a physical interpretation. Homework Equations \frac{d}{dt}(\frac{\partial L}{\partial \dot{s_{j}}})=\frac{\partial...
  3. J

    What physical experiment would tell you how many electrons an atom has

    How did scientists/chemists experimentally determine how many electrons an atom has? Hydrogen, carbon, oxygen, etc... I'm wandering what physical experiment would tell you how many electrons an atom has?
  4. phinds

    Is the event horizon of a black hole physical?

    In another thread, which I don't want to derail, the issue came up as to whether or not the event horizon of a black hole is physical. Some contend that it is physical but I contend that it is merely a set of coordinates (most easily represented by the spherical coordinate R). I DO...
  5. G

    What is the physical form of binary data in a computer processor?

    This a general, layman question. Computer processors work with binary digits, 1 and 0. Of course, computer processors can be seen as microscopic forms of Babbage's analytic engine. So in reality, in the circuits of a microprocessor, what physical form do binary digits take?
  6. J

    Physical meaning of autocorrelation

    Hi All, I was in a process of processing my vibration-test data. I now generated a plot of the autocorrelation function of the object acceleration. Please see the attachements (the second attachment is the close-up for small tau's). The x-axis in the plot is the time delay tau. You can see...
  7. A

    Moment of inertia physical pendulum

    Homework Statement I have a physical pendulum that is rotating about an fixed axis. The period is: T=2\pi \sqrt{\frac{I}{mgd}} I = moment of inertia d = distance between the center of mass and the axis. The problem is: If you add a mass in the end of the pendulum. The period is going...
  8. G

    Physical Applications of the Bernoulli Diff Eq

    I am curious what the nonlinear bernoulli equation is used to model. Is there a certain topic or context where it shows up often? Can any suggest some references for more info? I am reviewing some ODE stuff for an upcoming exam and would really like an intuitive feel for the equation and its...
  9. ShayanJ

    Physical significance of gauge invariance

    I've read that gauge invariance leads to a fundamental phenomenon.What is that? Thanks
  10. A

    Physical explanation of velocity time dilation

    In SR, pure relative velocity between two observers causes a time dilation between them. It seems that if the two observers were at rest w.r.t. each other at some point in time, then the one who accelerates to achieve the relative velocity is the one who gets time dilation (i.e. comparatively...
  11. P

    Lens - What physical features makes a lens thin?

    lens -- What physical features makes a lens thin? What physical features makes a lens thin? How can you differentiate one lens from the other based on their thickness? What is the measure of their thickness?
  12. mikeanndy

    Physical significance of Refractive index

    What is the physical significance of Refractive Index(RI) ?
  13. L

    Physical Chemistry 2: Best Book for Preparing & Acing the Course

    Hey guys, I hope this is the right spot to this. I don't want to get another infraction. I just got recently got out of my first physical chemistry class and am now thinking towards the second one. I'm wondering which book would be the best supplement to read over the break and help me get...
  14. Y

    Period of a Physical Pendulum: Finding T for a Uniform Disk

    Homework Statement A uniform metal disk (M = 9.81 kg, R = 8.99 m) is free to oscillate as a physical pendulum about an axis through the edge. Find T, the period for small oscillations. Homework Equations I (uniform disk, with axis through center of mass) = (1/2)MR^2 T = 2π√(I/mgd)...
  15. F

    Physical meaning of Differential Cross Section in scattering

    I'm learning scattering theory from Griffiths' book, and I don't really understand the meaning of differential cross section; it's one of those things that I find hard to conceptualize and give a physical meaning to. The most intuitive description he gives is "the proportionality factor between...
  16. C

    [Basic question] What is the 'physical' explanation of a division by a fraction?

    For example, dividing by 2, means we cut something in two. But dividing by 0.5, can only be explained with multiplying something by 2. So, is there a "physical" explanation of dividing by 0.5? Is it "I divide by an entity that internally multiplies' or something as so bizarre?
  17. A

    Why is a Blue Shift in Kruskal Szekeres not Physical

    In my intro. to GR class we recently covered the Kruskal Szekeres diagram and trajectories within the diagram. My question comes from a comment made by my professor about time-like trajectories emerging from v=0 and that if an emitter sends a light signal to an observer it will be blue shifted...
  18. E

    Is the Invariance of Physical Laws Linked to a Symmetry Group Structure?

    Homework Statement The invariance of physical laws to a coordinate change suggests a symmetry group structure. Can the operations of cordinate transformation be written as group operations? What is the group? Homework Equations The Attempt at a Solution At the moment I do not...
  19. M

    Is an imaginary electromagnetic gauge field something physical?

    Hi, my question is, if there is an interpretation for electromagnetic gauge fields, whose components are imaginary. This would lead to an imaginary magnetic field... Does anything like this exist? Or is it forbidden ny some first principal arguments? Thank you in advance for every input! Melvin
  20. K

    Physical Chemistry: Kinetics and fluorescence

    Homework Statement Consider fluorescence (light emission from an electronically excited state of a molecule) in the presence of a quenching molecule M. Quenching refers to the removal of energy from an excited electronic state by collision, and so without light emission. A mechanism for such...
  21. F

    Physical interpretation of j in E&M field equations

    Hi all. I've been trying to study microwave and electromagnetic engineering . I'm not sure how I should interpret j in some of the field equations. For example, for the field equations for a rectangular waveguide resonant cavity are: E_{y} = E_{0} sin\frac{\pi x }{a} sin \frac{l \pi z}{a}...
  22. J

    What is the Physical Reason for Gamma Rays Being Absorbed?

    But high frequency are absorbed, like gamma rays. I would think it would be the opposite. So what's the physical reason?
  23. S

    What Does Curl Measure in Physics?

    hi whats's the physical meaning of curl? and why it is a vector? it's definition is line integral per volume. i can't understand why this is a vector.
  24. shounakbhatta

    Exploring the Einstein Tensor and its Physical Implications

    Hello, Please excuse me if the following questions are very mundane: (1) The Einstein tensor in indices form: Guv=Ruv-1/2guvR Does uv means the indices i.e. just as we define row column in a matrix.? (2) The Einstein tensor is symmetric. Does that mean in matrix as we mean aij=aji...
  25. dexterdev

    What is the significance of variance and covariance equations?

    I have idea of physical signif of var(x),cov(x) but can't get derivations of equation. Hi all, I understood the facts that variance indicate the spread in random variable and covariance shows correlation between 2 r.v s etc. But I cannot imagine how we are arriving at their...
  26. M

    Physical Meaning of r in BL Coordinates

    Not much else to say other than the title. In the Schwarzschild spacetime, the radial coordinate r didn't represent radial distance, but it at least represented the thing that determines the area of a sphere centered on the large mass. It doesn't seem like that interpretation can be given to the...
  27. M

    The Influence of Low Energy Limits on Physical Matter, Space, and Time in Nature

    Is it agreed among the experts that physical matter as observed in nature and generally also space and time(classicality) have the properties they do, only because of the low energy limit that they have now(as opposed to the immense mass, gravity and energy density at the BB or a black hole)? As...
  28. F

    How Can I Calculate the Frequency of the Left Pendulum in a Coupled System?

    Coupled physical pendulums (URGENT) Imagine that you have coupled physical pendulums like this (see image below). mass is in the inferior part of the pendulum.* Now we let the right pendulum swing without initial speed = 0 with a certain amplitude. As we know, the amplitude of the right...
  29. J

    Why does the physical state of a substance primarily depend on its temperature?

    Let me know if i am correct here. Temperature is just the amount of energy associated with that particle or molecule? So why does that determine if it is solid, liquid, or gas? Why doesn't water turn into ice at room temperature when you compress it into itself enough? Like in star wars when...
  30. T

    If numbers are infinite in both directions, physical contact is impossible.

    This is a paradox that has been bothering me since I was taking algebra in high school. Let's say that I want to represent the distance between to objects. Given that numbers are infinite in both directions, by which I mean that there is no limit to how large, or small a number can be, there...
  31. X

    Dimension Of Physical Quantities

    Hi All PF Members... I'm New to this website.. Also new to physics... nd I'm very exited about this aweSome website...where I can post my problems... Experts I want list of All physical quantities and their Dimension... I've been searching and cannot find any thing good enough... Sorry for my...
  32. Q

    Physical Chemistry water vapor/phases present question?

    23.7 g of water is in a container of 23.7 L at 298.15 . The vapor pressure of water at this temperature is 23.76 Torr. A) What phases are present? B) At what volume would only the gas phase be present? C) At what volume would only the liquid phase be present? A) I know that only the...
  33. M

    Physical Chemistry Problem, Evacuated tube - where does reaction take place?

    Homework Statement Two balls, one soaked in concentrated HCl and the other in NH4OH are placed at the left and right ends of a 1m long evacuated glass tube, respectively. HCl and ammonia vaporize and travel down the tube, reacting to form a white ring where they meet. Where does the ring form...
  34. P

    Physical Chemistry- Partial Pressures

    Hello all, This is a homework problem for my CHE345 class. Not sure what to do here, please at least let me know if I'm in the right ballpark. Homework Statement A student decomposes KCLO3 and collects 35.2 cm^3 of O2 over water at 23.0°C. The laboratory barometer reads 751 Torr. The...
  35. S

    Exploring Optics: A Visual Guide to Understanding Light and Its Properties

    Can anyone tell me a self teaching book or lecture notes on physical optics which has all the concept written in very clear and simple way with lots of example and all the related derivation done in step by step manner . As I am not so familiar with this subject but I want to start it so a good...
  36. S

    Physical interpretation of one of Hamilton's equations

    Homework Statement I've attached a picture from a passage of my book (Liboff, Quantum Mechanics) with which I am having difficulty. Specifically, equation 1.25 claims to possesses a certripetal force factor (in the text underneith) and a moment arm factor. I see both of these terms present...
  37. Y

    Physical Chemistry without Previous Chem Experience

    Is it a good idea to take P Chem without taking any chemistry at college level? My high school had a strong chemistry program (we did organic in high school) but I haven't done any Chemistry in college. I am currently taking Quantum Mech 2, and will be taking Thermal Physics and Condensed Matter...
  38. N

    Courses Uni course- Biophysical Chemistry, or Physical chemistry

    Uh, my program is Biotechnology/biochem (might change it). I can take a "Biophysical chemistry"or a "physical chemistry" mind you, I am strugging to even pas year one physics i hate it and it sucks. So I really want something with not as much math. Does anyone know if biophysicalchem has less...
  39. C

    Time Dilation and physical processes

    If you travel at a sufficiently fast speed, then according to relativity, you will age at a slower rate compared to your slower moving contemporaries. This implies that biological functions (say, of a person) and mechanical functions (say, of a machine) are literally functioning at a slower...
  40. T

    Physical Chemistry- Using the integrated Vant Hoff Equation with K values.

    Homework Statement The equilibrium concentration of oxygen in fresh water exposed to the atmosphere is given for two temperatures. At 15 degrees celcius equilib [O2]= 630μmol/L at 25 degrees celcius equiln [O2]= 517μmol/L The expression for the equilibrium constant, K, between the oxygen...
  41. P

    How much control do we have over a gag reflex? Is it physical or mental?

    I was trying to drink a vegetable smoothie, which I really don't like, and I vomited twice in the process. My friend drinks it without issue. What's the difference here? My conscious mind really wants to drink the smoothie, but a few gulps in I feel an uncontrollable gagging. I'm curious how...
  42. Y

    Relationship of Physical Quantities in Functions

    Homework Statement This is actually a part of my physics lab assignment, but there isn't any physics involved here, so I chose to post this here. I hope that isn't a problem. Anyway, I've been given three data tables, and have been asked to make graphs for each of the data tables by hand...
  43. U

    Physical interpretation for this? (dynamics of Newton's method)

    Hello! I'm a math student, currently trying to write my diploma thesis. My field of study is complex dynamics (iteration of holomorphic/meromorphic functions, Julia sets and stuff). It's a farfetched idea, but currently I'm curious about a potential physical interpretation of the things I'm...
  44. A

    Calculating Air Volume and Composition with Physical Chemistry Principles

    A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168 Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume of the air saturated with...
  45. K

    Statistics Problems from Physical Chemistry

    Homework Statement The following data were obtained for trace elemental zinc in a particular sample of high purity (%Au> 99.99%). The results are given in mg Zn/ kg Au. 15.38, 15.17, 15.33, 14.88, 14.71, 15.42, 15.60, 15.22 Find the zinc content and the uncertainty at 95% confidence...
  46. J

    String Theory: Is Energy a Physical Entity?

    I was watching a video on string theory and they claim that its all vibrating strands of energy. I thought energy was just a property of the system, not a physical entity. So do they mean something else by "energy"?
  47. T

    Which Gas Has the Highest Vibrational Molar Heat Capacity at 50K?

    Number 1 For the gas phase reaction, cyclopentene + I2 = cyclopentadiene + 2HI, we find that ln Kp = 7.55 - (4817K / T) (where the symbol K on the right hand side refers to the units Kelvin). What are the changes in entropy and enthalpy? Possible answers are ΔSo = 40.05 kJK-1mol-1 and...
  48. M

    Why Do Physical Processes Favor Entropy Maximization Over Energy Minimization?

    hello! there is no law that says that processes occur physically towards the energy minimization of the system however, there is a law (second thermodynamic) that says that processes occur physically towards the entropy maximization 1) so, why do we need ΔG (Gibbs free energy) to predetermine...
  49. A

    Physical meaning of vector line integration

    hello.. I understand what line integral of a real function mean (the area) as well explained in https://www.physicsforums.com/showthread.php?t=115057 (Mentioning this link because there line integral of a real function has been explained.) I was trying to understand what would the vector...
  50. A

    Ohm's Law and its Physical Consequences

    Ohms law is in my book stated in the form: J = \sigmaE My question is about the validity of this statement (I know it is just an empirical law, but therefore you can still think of its consequences). If the above is true then the volume current density will depend on the strength of the...
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