What is Law: Definition and 1000 Discussions

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. M

    Newton's Third Law: Acceleration of box and worker

    Homework Statement On a horizontal frictionless floor, a worker of weight 0.900 kN pushes horizontally with a force of 0.200 kN on a box weighing 1.80 kN. As a result of this push, which statement could be true? A ) The box will not move because the push is less than its weight. B ) The worker...
  2. A

    Law of sines.... I don't get it

    Homework Statement Given is a triangle with sides a=3.1cm, b=5cm, c=4.7cm and opposite angle to side a, α=36°. I must find out for angles β and γ using the law of sines. Homework Equations Law of sines. The Attempt at a Solution [/B] I first tried: sin(γ)}/c=sin(α)/a ⇒ γ≈63.02°...
  3. Tom MS

    Why Does Diatomic Hydrogen Form Despite Zero Net Electric Field?

    Say you had two isolated hydrogen atoms. Because of the spherical distribution of electronic charge on each hydrogen and the net charge of 0 outside each atom, wouldn't Gauss's law dictate a 0 net electric field outside each atom? If this is the case, why does diatomic hydrogen so readily form...
  4. ISamson

    Hacking: Legal and Ethical Problems

    On the weekend I have participated in a hacking and cybersecurity competition. We were assigned some capture the flag challenges in teams and we had an awesome weekend of hacking! My teammate and I have won the high school division and as a prize we get a Wi-fi Pineapple Nano Basic. This is a...
  5. K

    Correct statement of 2nd law of thermodynamics?

    Thermodynamics is stated in different ways. E.g. In isolated systems entropy never decreases Heat never spontaneously pass from colder to warmer body Total energy quality decreases in all processes. Energy disperses But what is it exactly? What is the correct description of the 2nd law of...
  6. E

    Gauss' Law for electromagnetic radiation?

    For the proof I've read that verifies transverse electromagnetic waves are consistent with Gauss' Law, there seems to be the suggestion that the magnetic and electric field at a given small length c(dt), along which the waves travel, propagate infinitely backwards and forwards in their...
  7. R

    Newton's first law of motion and Inertial Systems

    I have just begun my journey in Classical Mechanics with the book "An Introduction to Mechanics" by Kleppner and Kolenkow. I find myself stuck at Newton's first law. The book presents Newton's first law as follows: "Newton's first law is an assertion that inertial frames exist." The book also...
  8. C

    Is This Ohm's Law Application Correct for an OP-AMP Circuit?

    Homework Statement Hi, So I'm just curious whether or not the following statement is correct for the circuit shown. It's part of a bigger problem involving OP-AMPS, the part of the circuit shown is the upper loop connecting from the inverting to the output. I was just having some doubts in...
  9. M

    Ideal Gas Law Homework: Calculating Number Density and Spacing Between Molecules

    Homework Statement Consider an ideal gas at 25.0 degrees Celsius and with a pressure of 1.00 atm. a) What is the "number density" of the molecules, expressed as molecules per unit volume? (Cubic meter, cubic centimeter or liter) b) What is the typical spacing between molecules in the gas? Of...
  10. S

    Calculating ΔH Using Hess's Law for FeO(s)CO(g) Reaction

    Homework Statement Using Hess's law, calculate the ΔH value for the following reaction: FeO(s)CO(g)→Fe(s)+CO2(g) Use these three reactions: 1. Fe2O3(s)+3CO(g)→2Fe3O4(s)+CO2(g) ΔH= -25.0 kJ 2. 3Fe2O3(s)+CO(g)→2Fe3O4(s)+CO2(g) ΔH= -47.0 kJ 3. Fe3O4(s)+CO(g)→3FeO(s)+CO2 ΔH= +38.0 kJ...
  11. W

    How Long Does It Take for a Handle to Become Unbearably Hot?

    Homework Statement The question below is asking how long it would take for the cooler side of the handle to heat up till its unbearably hot. I'm having a bit of trouble trying to understand the solution and would like some guidance. I can't seem to get how the ##\Delta T ## that represents...
  12. L

    Newton´s second law: Force definition? (Philosophy matter).

    Hi people! A may be philosophical question, in fact my doubt comes from epistemology class: Newton´s second law is a definition of force based on 2 previously defined things: momentum and time or is a relation found by Newton between 3 previously defined things: force; momentum and time? Thanks.
  13. P

    How does the differential form of Faraday's law relate to induced current?

    Homework Statement I'm in a class where we have to essentially learn E&M ourselves and I'm challenged by Maxwells equations. I'm studying out of Purcell's E&M. The differential form of Faradays law for Maxwells equations is curl E = -∂B/∂t Im having trouble interpreting what to make of this...
  14. I

    B Regular derivation on The Universal Law of Gravitation?

    Hello Everybody, I am Meaningless and I had this doubt on Newtons laws of gravitation while deriving it. My textbook stated the following derivation 9 for any two masses m1, m2, and radius 'r' It stated that according to the law of product of masses...
  15. J

    What is the Ideal Gas Law for a Two-Bulb System with Varying Temperatures?

    1. Two equal glass bulbs are connected by a narrow tube and the whole is initially filled with a gas at a temperature of T0 and pressure of P0. Then, one of the bulbs is immersed in a bath at a temperature, T1 and the other in a bath at a different temperature, T2. Show that in this problem, the...
  16. R

    Slide generator/hookes law problem

    Homework Statement A stiff spring with a spring constant of 1200 N/m is connected to a bar on the slide generator as show in figure P32.40 Assume the bar has length l = 60 x10^-2 m and mass .75 kg, and it slides without friction. The bar connects to a U shaped wire to form a loop that has width...
  17. L

    Newton's Law Problem (Did i do this correctly?)

    Was wondering if i got the answer correctly or got it by coincidence (answer is 3.0 m according to answer key) 1. Homework Statement ≈Homework Equations F = ma The Attempt at a Solution Ff = μk*N N = mgcos(20)=18.41 = W W = fd W = ΔKE = 0-2 = -2 -2/f =d f = just the x components since y...
  18. R

    Elastic collisions and Newton's third law

    Hi everyone, I am new to this forum, and I'm having a hard time understanding Newton's third law and collisions, first of all I want to say that it is not homework and that I do know the basics of physics, vectors, energy, work, and momentum I also know and understand Newton's first and second...
  19. P

    Using Newton's 2nd Law to find acceleration

    So this is my first time posting on here and I hope I'm doing right! 1. Homework Statement A 75-kg snowboarder has an initial velocity of 5.0 m/s at the top of a 28 ∘ incline. After sliding down the 110-mlong incline (on which the coefficient of kinetic friction is μk = 0.18), the snowboarder...
  20. S

    Conservation of Energy and Angular Momentum in Inverse Cube Force Problems

    Homework Statement I'm given a force law is F = \frac{-k}{r^3} and that initially, the particle is in a circular orbit the particle is given an impulse parallel and in the opposite direction to its velocity find the distance from the center for the particle as a function of time. Homework...
  21. Javier Mont

    About moving through the air and Newton´s 3rd law

    How are we able to move trough the aire if the air exerts a force equal to the friction we use to push us through air? I´ve had this problem in my mind since some days now. I did this picture: url: https://www.kn3.net/60DAC45480AJPG.html
  22. D

    Boyle's law pressure calculation

    Homework Statement An pillow is inflated with an pressure of let's say 20 hPa. Afterwards we place a weight of 10 Kg on the pillow, what is the pressure increase within the pillow? P athmosthere = 1013 hPa P cushion = 1013 + 20 = 1033 hPa m = 10 Kg g = 9.81 m/s^2 Amount of air in the pillow...
  23. K

    Why a book on a table is not an example of Newton's 3rd law?

    In a physics test in a Norwegian website of a school book, it says following: True or false? (1) According to Newton's 3rd Law, the weight of a book that is on a table is just as big, but opposite the force on the book from the table (normal force). FALSE. (2) According to Newton's 1st Law...
  24. A

    How Do Hydraulic Systems Apply Pascal's Law?

    Homework Statement The large cylinder in a hydraulic press has 3 times the surface area of the small cylinder. What force should be applied to the small cylinder to create a lifting force of 7200 Newtons In a hydraulic-brake system, a force of 25 N can be applied to a surface area of 5 cm^2...
  25. N

    Does the Direction of Current Affect Ohm's Law Sign Convention?

    Here the voltage is negative so the current is negative. does it matter if I traverse the circuit through the other direction?
  26. T

    Wave optics / Snell's law of refraction

    When light from a rarer medium enters a denser medium, the wave gets refracted into the denser medium and so the wavelenght and the speed of propagation decreases ( [v][1] >[SUBv][/SUB2]) but the frequency remains the same. HOW ? [SUBv][/SUB1] / [SUBλ][/SUB1] = [SUBv][/SUB2] / [SUBλ][/SUB2]...
  27. T

    Understanding Gauss' law: diff b/w E and D flux?

    I noticed the other day something odd in how we use Electric and Magnetic flux. The definitions I refer to are magnetic flux density (B), magnetic flux intensity (H), electric displacement field (D) or Electric field density (D) and electric field (E): B = μH ΦB = B*Area & D = εE ΦE = E*Area...
  28. S

    How Does Newton's Third Law Apply When a Bat Hits a Ball?

    The following reasoning leads to an apparent paradox; explain what’s wrong with the logic. A baseball player hits a ball. The ball and the bat spend a fraction of a second in contact. During that time they’re moving together, so their accelerations must be equal. Newton’s third law says that...
  29. K

    Is the Law of Conservation of Energy Valid in a Non-Local Context?

    Is it accepted that the law of conservation of energy can be considered in a non-local context? If this is not accepted, then why not?
  30. F

    Question about the Hamiltonian and the third law of thermodynamics

    The third law of quantum mechanics states that a system at absolute zero temperature has zero entropy. Entropy can be conceived as an expression of the number of possible microstates that can produce an identical macrostate. At zero entropy, there should be exactly *one* microstate configuration...
  31. A

    What Are the Correct Units for Kepler's Third Law?

    I am confused about the units used in Kepler's 3rd law. Is T supposed to be in years or days? Is R supposed to be in kilometers or meters? Is there ever an instance where one combination of units is preferable over another (for example, if you want to use the answers from Kepler's third law to...
  32. A

    Newton's 3rd Law Dynamics Problem

    Homework Statement A 12.0-kg box is pushed along a horizontal surface by a 24-N force as illustrated in the diagram. The frictional force (kinetic) acting on the object is 6.0 N A) What is the acceleration of the object B) Calculate the value of the normal force acting on the object C) If the...
  33. Marcin H

    Ampere's Law and Choosing a Loop for Integration

    Homework Statement Homework Equations Amperes law The Attempt at a Solution This is a solution to an old exam and I am confused by the application of amperes law here. What is the general rule for drawing our "ampere'ian surface" when using amperes law? I thought we have to draw a...
  34. A

    Magnetic field of off center triangle - Biot Savart Law

    PICTURE INCLUDED 1. Homework Statement A piece of wire is bent into an isosceles right triangle whose shorter sides have length a The wire carries current I. Calculate the magnetic field for point P. Point P is located on the Y-axis ( 0, √2a). Two corners of the triangle are are located at...
  35. Marcin H

    Lenz's Law and Faraday's Law clarification

    Homework Statement This isn't a problem, but I wanted to get some clarification of Lenz's law and Faradays law. So if you have a solenoid of wiresand you take a magnet and move it through the solenoid with a velocity v that magnet will induce a current into the wire according to the right hand...
  36. G

    Understanding Newton's First Law of Motion: Exploring the Concept of Inertia

    Let's say a shovel carrying a pile of dirt is moving right and then make a sudden stop. The dirt then falls off the shovel moving in the same direction as the shovel was moving. This is an example of Newton's first law of motion. For this to happen, the net force must equal 0 on the object, so...
  37. M

    Inverse Square Law with Half Value Layers for X-Rays

    Hello all, I have posted on Physics Forums a few times in the past, but mostly for help with my old physics classes and not anything in the real world. Part of my work involves radiography, but it is generally done in a field environment where we just shut down large sections of land to safely...
  38. L

    Two Questions on Newton Law Problems

    These are conceptual questions, and i just want to really understand why the answer is the answer! 1. Homework Statement 1) A force acts to push two boxes, box 1 and box 2, across a floor (assume for this problem that friction is negligible). The two boxes are stacked such that the force...
  39. J

    Does the inverse square law hold indefinitely for gravity?

    If the inverse square law for gravity varies with distance or distribution of matter, might the need for “dark matter” be obviated?
  40. Sophrosyne

    Scientific law vs. theory, Newton vs. Einstein

    My son is taking a chemistry class in high school, and he was telling me this morning that their teacher had taught them there was some kind of fundamental distinction between scientific laws and theories. He said the teacher had told them that laws are just fundamental regularities observed in...
  41. L

    Newton's third law - normal force

    Homework Statement A book is placed on a chair which is standing on the floor. An iPad is placed on the book. The floor exerts a significant force: A) only on the book B) Upwards on chair and downwards on book C) ONLY upwards on chair D) upwards on chair book and iPad E) downwards on...
  42. N

    Using Gauss' Law to Calculate electric field near rod.

    Homework Statement No variables, just a conceptual question. Homework Equations Flux = EA = Q/ε The Attempt at a Solution Given a uniformly charged rod of FINITE length, could we use Gauss' law for electric flux to calculate the field at a point p a distance x away from the rod, so long as the...
  43. S

    Coulomb's Law, Three Charges, X Y Components, Angle

    Homework Statement This is finding net force on Q3. I was taught by my Physics teacher to always get angle from the Positive side of x-axis (+X-Axis). For example in the above situation, if the angle is -30deg from the +x-axis (assuming the Q3 is the origin), Why is F31 x-component = 140...
  44. Q

    Confused about Newton's 3rd law of motion

    I have read section from "Kleppner and Kolenkow, An Introduction to Mechanics" about Newton's 3rd law of motion, What does red-lined sentence means ? Why "somewhere in the universe ... on some other body" ? Please explain.
  45. V

    B Exploring Brewster Law: Applicability to Opaque Materials

    Does Brewster law applicable to Opaque material?
  46. NFuller

    I Understanding Gauss's Law: Where Does the Argument Break Down?

    So, this has been bothering me for a few days and I'm having trouble understanding where the fault is. If we consider a uniform charge density ##\rho## extending through all space, then by symmetry, I would argue that ##\mathbf{E}=0## in all space. However, this does not agree with what a naive...
  47. X

    Simple Law of Cosines Question

    Homework Statement Huge suspension bridges are build with the Earth's roundness in mind. The two towers are plumb line straight up and down and yet, because of their colossal size, they are a bit further apart at their tops than they are at their base. So, how can we calculate what this...
  48. Xarzu

    MHB Simple Law of Cosines Question

    Simple Law of Cosines Question Huge suspension bridges are build with the Earth's roundness in mind. The two towers are plumb line straight up and down and yet, because of their colossal size, they are a bit further apart at their tops than they are at their base. So, how can we calculate...
  49. E

    Understanding Newton's Third Law in Action: A Truck Pushing an SUV

    Homework Statement A 2,300 kg truck pushes a 2,500 kg SUV, and they both move at 3.75 m/s2. I am to find the force that the SUV exerts on the truck. Homework Equations F=ma The Attempt at a Solution I solved this problem already, it was just taking the acceleration I had found (3.75) and...
  50. T

    Faraday's law -- circular loop with a triangle

    Homework Statement A circular coil with radius a is connected with an equilateral triangle on the inside as shown in the figure below. The resistance for each section of the wire is labeled. A uniform magnetic field B(t) is pointing into the paper, perpendicular to the plane of the coil. B(t)...
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