Law Definition and 999 Threads

Law is a system of rules created and enforced through social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and the art of justice. State-enforced laws can be made by a group legislature or by a single legislator, resulting in statutes; by the executive through decrees and regulations; or established by judges through precedent, usually in common law jurisdictions. Private individuals may create legally binding contracts, including arbitration agreements that adopt alternative ways of resolving disputes to standard court litigation. The creation of laws themselves may be influenced by a constitution, written or tacit, and the rights encoded therein. The law shapes politics, economics, history and society in various ways and serves as a mediator of relations between people.
Legal systems vary between countries, with their differences analysed in comparative law. In civil law jurisdictions, a legislature or other central body codifies and consolidates the law. In common law systems, judges make binding case law through precedent, although on occasion this may be overturned by a higher court or the legislature. Historically, religious law influenced secular matters, and is still used in some religious communities. Sharia law based on Islamic principles is used as the primary legal system in several countries, including Iran and Saudi Arabia.Law's scope can be divided into two domains. Public law concerns government and society, including constitutional law, administrative law, and criminal law. Private law deals with legal disputes between individuals and/or organisations in areas such as contracts, property, torts/delicts and commercial law. This distinction is stronger in civil law countries, particularly those with a separate system of administrative courts; by contrast, the public-private law divide is less pronounced in common law jurisdictions.Law provides a source of scholarly inquiry into legal history, philosophy, economic analysis and sociology. Law also raises important and complex issues concerning equality, fairness, and justice.

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  1. E

    I Stefan-Bolzmann law in n-dimensions, what is wrong

    In one old version in wikipedia, the Stefan-Boltzmann law was derived in n-dimensions: https://en.wikipedia.org/w/index.php?title=Stefan–Boltzmann_law&oldid=751446657#Stefan–Boltzmann's_law_in_n-dimensional_space Then one theoretical physicist come and deleted it...
  2. T

    Faraday's Law - loop turning in the Earth's B-field

    Homework Statement Homework Equations Faraday's Law, Ohm's Law, definition of current[/B]The Attempt at a Solution We were given this solution:[/B] The above solution is leaving out a lot of intermediary steps. I don't agree that "the axis of the coil is at 20°, not 70°, from the...
  3. A

    Time Uncertainty Propagation - Stoke's Law & Average Time

    Homework Statement [/B] So basically I am calculating the terminal velocity for a small sphere falling in a measuring cylinder filled with glycerine. The distance traveled is 20 cm (0.20 m), and I have conducted 3 trials for each temperature. I have measured the displacement of the ball using...
  4. felipe de carli

    Torque lost using Newton's law of viscosity

    Homework Statement Two circular plates, as indicated in the figure, slide one over the other. Calculate the torque lost in this situation. The rotation w of the internal radius of the plates R1, the outer radius of the plates R2, the absolute viscosity of the lubricant between the plates (η)...
  5. L

    MHB A question about the law of total probability

    Dan put n different kinds of cheese in a row randomly, so that between two kinds of cheese there is a space. Then he puts a pickle on one of the n-1 spaces between the cheeses randomly. What is the probability of goat cheese and parmesan cheese (2 from n kinds of cheese) to be in the different...
  6. K

    I Proof of a law versus proof of a theorem

    if I get proof of fundamental laws like Newton's laws of motion or fundamental laws of thermodynamics then will they be laws anymore or will they become theorem. Please tell
  7. Voq

    End of Moore's Law? Future of Transistors & Computing Tech

    What are indications for future development of transistors and general computing technology design with the Moore's law in mind? Are we going to redesign architecture for better efficiency and what future brings?
  8. S

    Current & Ohm's Law: Continuous vs Discrete?

    When we talk about current and ohm’s law, do we pretend that current is continuous rather than discrete in the same way that we do with charge distributions?
  9. Dustin

    B 4 Questions About Lenz's Law Experiment

    Hello, I have four questions. As it stands now, I don't have the necessary materials to test this myself, which is how I'd prefer to learn the answer. I still plan on doing this experiment for fun once I can acquire the necessary components. This deals with Lenz's Law. My goal is to maximize...
  10. G

    Help with this Law of Thermodynamics question please

    MODERATOR'S NOTE: NO TEMPLATE BECAUSE THREAD WAS ORIGINALLY POSTED IN A NON-HOMEWORK FORUM A monoatomic gas is present i n cylinder if its volume increase from 100cm3 to 200cm3 at constant pressure 1*10^5 what is change in internal energy. I tried to solve it but couldn't. I tried to solve it...
  11. E

    B Does Hubble's Law imply that galaxies are accelerating away

    Is I understand it Hubble's law states that V = Hd = dx/dt Solving this differential equation, I got d = kexp(HT) where k is an arbitrary constant. This implies d²x/dt² = Hv = H²d and dⁿx/dtⁿ = Hⁿd. However (at least for me), finding the value of k is a problem, for 1, it must vary from galaxy...
  12. ytht100

    Infinitesimal, Snell's law, and ray tracing

    With FIXED SOURCE AND RECEIVER, I have a light incident from fluid 1 with velocity v1 into fluid 2 with velocity v2. Obviously, according to Snell's law, v1/v2=sin(alpha1)/sin(alpha2), where alpha1 and alpha2 are the angles with regard to the vertical line. My question is: how to calculate...
  13. Ignitia

    Ampere's Law with a coaxial cable

    Homework Statement A portion of a long, cylindrical coaxial cable is shown in the accompanying figure. A current I flows down the center conductor, and this current is returned in the outer conductor. Determine the magnetic field in the regions (a) R ≤ r1, (b) r2 ≥ R ≥ r1, (c) r3 ≥ R ≥ r2, and...
  14. Ignitia

    Biot-Savart Law with two semi-circles

    Homework Statement The accompanying figure shows a current loop consisting of two concentric circular arcs and two perpendicular radial lines. Determine the magnetic field at point P. Homework Equations B = μ/(4π) ∫ (I*dl x r)/r2 Btot = Ba - Bb The Attempt at a Solution For part a: Ba =...
  15. A

    Help with Coulomb's law problem

    Homework Statement The correct answer is 20.3 kg, but I got 23.4 kg. What did I do wrong here? Please refer to part 3 for the problem question. Homework Equations Refer to part 3. The Attempt at a Solution [/B]
  16. K

    How does Newton's Law change with rotation between frames?

    If we have two frames related by ##x' = Rx## where ##R## is a rotation matrix and ##t'=t## Newton's law doesn't remain the same, for $$m \frac{d^2 x'}{dt'^2} = m \frac{d^2 Rx}{dt^2} = mRa$$ whereas it will be just ##ma## in the other frame. How do we solve this?
  17. J

    How to find speed with Faraday's law

    Homework Statement A metal rod can slide on a rail without any friction in the presence of uniform magnetic field of B=1T which is perpendicular to the plane of the paper.The distance between the tracks is d=0.1m and the resistance given is R=0.1 ohm.The resistance of the rail is negligible and...
  18. P

    Derivation from the 0th Law of Thermodynamics

    Homework Statement I really don't know if I'm in the right subforum... I've started reading this text on statistical mechanics from MIT, but I'm stuck on page 2. Here's the statement: Let the equilibrium state of systems A, B, and C be described by the coordinates {A1, A2,· · ·}, {B1, B2,·...
  19. E

    Measurement Errors in Kirchhoff's Voltage Law

    Homework Statement For a lab, we explored Kirchhoff's Laws. I made a procedural mistake while measuring my voltage values across my different elements. I know that all of my calculated voltage sums are correct, so I was wondering what I might have done to have loops ACBA and CDBC have almost...
  20. F

    Meaning of Current in Ohm's law

    If we had a parallel circuit with a voltage of V between the beginning and end, and the circuit has a resistance R, then the current given by ohms law is I = V/R. What does this mean? The current is not the same throughout the whole circuit. Where is the current equal to this value?
  21. M

    I Is Ohm's Law Applicable to Semiconductors in a Magnetic Field?

    Is correct to calculate the resistance of a semiconductor sample in a magnetic field with ohm’s law?
  22. Ignitia

    Biot-Savart Law For Calculating Net Magnetic Field

    Homework Statement Two long wires, one of which has a semicircular bend of radius R, are positioned as shown in the accompanying figure. If both wires carry a current I, how far apart must their parallel sections be so that the net magnetic field at P is zero? Does the current in the straight...
  23. isukatphysics69

    Newton's second law problem with friction

    1. Homework Statement i did part a,b,c but i am confused about part d.. i have a test tomorrow and will reattempt this when i wake up but i really need a hint here..so when the worker pulls upward he is decreasing the magnitude of -mg right? so if Fn and mg initially cancel each other out...
  24. DylanXO

    Solve Snell's Law: Glass Cube Refractive Index = 1.77

    Homework Statement A ray of light is traveling in a glass cube that is totally immersed in water. You find that if the ray is incident on the glass-water interface at an angle to the normal greater than 48.7°, no light is refracted into the water. Calculate the refractive index of the glass...
  25. P

    Blocking the symmetry of motion and the second law

    Hi, The article below states that they made a material that blocks the motion of molecules in only one way but passing the other way is possible. See the article. https://physicsworld.com/a/blocking-the-symmetry-of-motion/ This seems to me in contrast with the second law. You can for example...
  26. Conductivity

    Permittivity in Gauss' law and Ampere's law

    In the derivation of the electric field inside a non conducting sphere, We still use the permittivity of free space even though we are in a medium. The same applies for ampere's law in a solid wire. http://physics.bu.edu/~duffy/semester2/c15_inside.html...
  27. A

    Verification of Ampere-Maxwell Law

    Homework Statement A current I flows along a wire toward a point charge, causing the charge to increase with time. Consider a spherical surface S centred at the charge, with a tiny hole where the wire is – see figure below. The circumference C of this hole is the boundary of the surface S...
  28. C

    What is the last step in the derivation of the Biot Savart Law?

    Homework Statement Hi, So I'm having some trouble deriving the biot savart Law. We have been given a derivation in the notes and I understand everything up until the last step which is labelled in the picture? Equating the two, How did the B vector turn into dB? It seems like he...
  29. G

    Using Gauss's Law to Calculate Electric Field of a Charged Thread

    Hello, Can not Gauss's Law be used to calculate the electric field generated by a uniformly charged finite thread? I suppose it is because I can not consider the electric field constant (always going to the same direction), and for this I would have to do it by parts (the lateral flow, and the...
  30. B

    Apparent (clearly false) contradiction - Kepler's Third Law

    Homework Statement When considering a satellite in geosynchronous orbit, its speed is zero across (relative to) Earth's surface. From Kepler's third Law: T2=(4π2r3)/(GM), we can derive that v2=GM/r This would tell us that as the radius of a satellite to Earth's centre increases, its velocity...
  31. D

    Kirchhoff's First Law to solve a circuit with 2 loops

    Homework Statement I've recently watched a video which explains Kirchhoff's first law however, I'm not sure about his calculations. I got the same answer just wanting to make sure I am doing it right. the guy wrote L1: -75I2 +3V=0 ⇒ I2= -3/-75=0.04A He calculated L2 like -12V -125I3 +75I2=0 ⇒...
  32. Osvaldo

    B Newton's Law of Gravitation: Balancing Centrifugal Force & Internal Pressure

    How is the centrifugal force in an orbiting planet or star, balanced if according to Einstein there is not such gravity force and is only space time curvature. Also, how come in order to determine internal pressure of a planet or star, the force acting near the center is calculated using the...
  33. M

    Newton's Second Law Rocket Problem

    Homework Statement A person whose mass is 20 kg needs to accelerate vertically from the surface of the Earth at 5.0m/s^2 and is trying to pick which rocket he should strap to his back. How much thrust does he need if each rocket has a mass of 30 kg? Homework Equations F=ma The Attempt at a...
  34. L

    How Does the Absorption Law Simplify This Boolean Function?

    Homework Statement i'm viewing an example written in class. it looks like this: f(x1, x2, x3, x4) = [(not x1) * x2 * x4] ∨ [x2 * x3 * x4] what should be function after applying absorption law? Homework Equations i know how another option called "gluing" works: [x1 * x2 * x3] ∨ [(not x1) *...
  35. W

    There is more to Kirchoff than a law....

    Found this brief read on my new feed, thought it would be appreciated here.
  36. F

    B Quotient Limit Law: Find the Value of the Limit

    The quotient limit laws says that the limit of a quotient is equal to the quotient of the limits. If we had a limit as x approaches 0 of 2x/x we can find the value of that limit to be 2 by canceling out the x’s. If we split it up we get the limit as x approaches 2 of 2x divided by the limit...
  37. J

    D’Alambert vs Newton’s second law?

    I’m a bit stuck with differentiating between the conservation of energy and D’Alambert. For a question I need to find the average resistance of the ground after it has been struck by an object. I chose to look at the equation as Ma + Mgh - Fr = 0. Can you advise if this is correct?
  38. S

    Apparent ambiguity in the E field direction in Faraday's Law

    I'm confused by an apparent ambiguity in the direction the E field in Faraday's law: ∫ E°dl = - ∂/∂t ∫ B°da Faraday's law says the change in magnetic flux through an open surface gives rise to an emf equal to E°dl taken around the closed loop which is the boundary of the open surface. And...
  39. F

    Gauss’ law and Enclosed Charges

    What exactly does the electric field as solved for by Gauss’s law tell us? If you use a Gaussian surface that encloses no charge you find that the electric field is equal to 0. But if there is a charge outside of that Gaussian surface, it is not true that the electric field is 0 on the Gaussian...
  40. Conductivity

    Derivation of magnetic field of a Solenoid: Biot savart law

    Hello, I have seen that biot savart's law works for infinitely narrow wires: "The formulations given above work well when the current can be approximated as running through an infinitely-narrow wire." When I wanted to derive the magnetic field of a solenoid, I had to do this substitution...
  41. David John

    Coulomb's Law Grade 12 Question -- Net Electric Field affecting a Charge

    Homework Statement Examine the charge distribution shown. b) What is the net electric field acting on charge 1? Homework Equations I used the equation E= (kq1/r^2) + (kq2/r^2) The Attempt at a Solution I subbed 9.0 x 10^9 in for k, 3.0 x 10^-5 for both q1 and q2, and 2m for r. My final answer...
  42. T

    Rectifying my logic of Gauss's Law

    Homework Statement Homework Equations The Attempt at a Solution E4Πr2 = Q/∈0 49000⋅4Π4.12 =Q/∈0 Q = 91.6 μC Qshell = Q = 91.6 μC Qshell = Qinner + Qouter 91.6 = -3.3 + Qouter Qouter = 94.9 μC Can someone point out the error? I have skipped too many lectures and I am catching up right...
  43. A

    I Stefan-Boltzmann Law: IvdvcosΘdw Explained

    I am having a doubt of why is the radiative flux IvdvcosΘdw in equilibrium integrated for a spherical black body only from 0 to pi/2 not pi(e.g. For the entire surface for which it is zero), v=frequency dw= solid angle
  44. R

    I Heat death of the universe and the 3rd law of thermodynamics

    If the universe keeps expanding and eventually ends in a "big freeze" or heat death, does this contradict the third law of thermodynamics? The third law of thermodynamics states that a crystal at absolute zero has zero entropy. Since the entropy of the universe can never decrease, as the age...
  45. Nick tringali

    Is the Law of Conservation of Mass Always Obeyed?

    Are the laws of conservation of mass always obeyed. in a nuclear reaction mass is converted to energy therefore mass isn't conserved. I understand that energy is always conserved, but I feel like mass isn't.
  46. J

    Kepler's 3rd Law Question finding how long a year is for Pluto

    Homework Statement Kepler's Constant for any object or planet orbiting the sun is 3.36x1018m3/s2. Calculate how long a year is for Pluto given the "radius of object" is 3.0x106m and the "mean radius of orbit" is 5.9x1012 Answer: 7.82x109s Homework Equations K = T2/R3 The Attempt at a...
  47. mastermechanic

    Video Sources for Anisotropic Hooke's Law

    Hello everyone, I'm taking Mechanics of Materials II this semester which includes Anisotropic Hooke's Law, Plane Stress & Strains, Mohr Circle and so on. I need a video source of these topics. The videos on youtube mostly have bad camera position. I want something like coursera stuff but there...
  48. E

    Charges pushed to the ends of a pole -- Faraday's law

    Homework Statement We put a pole with a length of 0.2m in a magnetic field equals to 0.4T and move it with a velocity of 4m/s. What is the value of the charges that accumulate in the ends of the pole? Homework Equations E=Bv ε=El The Attempt at a Solution I know that E=1.6V/M and ε=0.32V (Book...
  49. S

    Biot-Savart's law and Ampere's Law -- are they the same?

    Homework Statement Homework Equations is biot-savarat law and ampheres law equivalent? The Attempt at a Solution
  50. T

    Centripetal Force Homework: Find Car Speed to Lose Contact w/ Road

    Homework Statement Find the speed at which a car of mass M will lose contact with the frictionless road Homework Equations Centripetal/Centrifugal forces (maybe?) The Attempt at a Solution I used OneNote to attempt this problem[/B]...
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