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. E

    Maxwell's/Faraday Law Concern Propagation of Induced Fields

    The integral form of Maxwell's equation pertaining to induced electric fields is: ∮E(t0)⋅dℓ= −dΦ(t)/dt|t=t0Say for a long time, in some circular region there has been no B or E fields present. Then, there is a sudden constant increase of B field introduced in the middle. I know that information...
  2. A

    Drawing flux and induced EMF graphs - Faraday's/Lenz's law

    I would really appreciate some clarification about how to draw graphs showing changing flux and induced EMF. I understand that there needs to be a 90 degree phase difference as the EMF is a maximum when the flux has the greatest rate of change. However, our exam board says that the EMF can be...
  3. Biker

    Induced EMF in a circle: Faraday's law

    Homework Statement Explain what happens in the following situation: You have a loop in the form of a circle and there is a varying magnetic field inside that loop as the following picture illustrates: Homework Equations Faraday's law lorentez force The Attempt at a Solution I first thought...
  4. A

    I Exploring the Connection Between Charles Law and Absolute Zero in Ideal Gases

    Why do all the volume temperature curves of an ideal gas intersect at the same point on the temperature axis ?
  5. Conductivity

    How does Faraday's law include self inductance?

    A varying magnetic flux causes an induced voltage (according to Faraday-Lenz law) that generates a current that generates a magnetic field that generates another magnetic flux in the same circuit. Does the Faraday-Lenz law include this self induction? In other words why can't we take that...
  6. N

    Are Exothermic Reactions a Violation of the Law of Conservation of Mass?

    Are exothermic reactions violation of law of conservation of mass , because energy and mass are equivalent? Please clarify!
  7. R

    Direction of current in Kirchoff's second law

    Hello, I'm going through Kirchoff's second law, and stumbled across this example on this page: In the image above, you can see that the blue arrows (both arrow 1 and arrow 2) indicate the direction that the current goes in. However, I am wondering why the current cannot go as per the red...
  8. R

    Hooke's Law Q3: Does Increasing Cross Sectional Area Reduce Work?

    3. The Attempt at a Solution My thinking is that if cross sectional area of the cords increase wouldn't the cords be heavier and thus it would require more work to pull/stretch the device? So more work is done? (But the answers say less work is done because there is a smaller extension/won't...
  9. G

    Raoult's law, Henry's Law, relative volatility

    Raoult's law: P = xP* , combined with Dalton's law becomes y = xP*/P Henry's law: P = kx, combined with Dalton's law becomes y = kx/P Relative volatility: y = ax/(1 + (a -1)x) Raoult's law and Henry's law are linear when temperature and pressure are kept constant. But if we vary the temperature...
  10. parshyaa

    How can we prove the law of conservation of mass

    How can we prove the law of conservation of mass ? I said prove not the verification, how lavoiser decided that yes this law is followed by every chemical reaction, is there a proof
  11. R

    Hooke's law and elastic deformation

    The Attempt at a Solution [/B] I know that spring A shows elastic deformation since it returned to its original shape once the stress removed and spring c shows plastic deformation and has been permanently extended so it won't return to its original shape. BUT, I'm struggling to complete the...
  12. donaldparida

    Understanding Ohm's Law: Electric Current & Potential Difference

    According to Ohm's law, "Physical conditions remaining the same, the electric current flowing through a conductor is directly proportional to the potential difference across the two ends of the conductor" I have two conceptual queries: FIRST When the ends of the conductor are not connected to...
  13. T

    B Re-evaluating Dark Matter and Kepler's Law in Spiral Galaxies

    I keep reading articles that assert that spiral galaxies would fly apart if it were not for the presence of a dark matter halo. The observation that rotational speeds vary little with distance from the center is usually cited as the 'proof' of dark matter since this behavior would otherwise...
  14. Siddharth Rajvanshi

    I Ideal Gas Law and Differentiation

    Is it possible to calculate the rate of change of n with respect to rate of change of Pressure and rate of change of Temperature with V unknown but constant by PV = nRT? Rate of change of Pressure and rate of change of temperature can be measured. R and V are constants.
  15. Kernul

    Hooke's Law Second Order Differential Equation

    Homework Statement A mass ##m## on a frictionless table is connected to a spring with spring constant ##k## so that the force on it is ##F_x = -kx## where ##x## is the distance of the mass from its equilibrium position. It is then pulled so that the spring is stretched by a distance ##x## from...
  16. Phys_Boi

    Total Time for Newton's Law of Gravitation

    Homework Statement Find the total time, t, that an object takes to reach the surface of the Earth from a distance, D, using the Law of Gravitation: $$F_{g} = \frac{GMm}{x^2}$$ R is radius of Earth D is distance from surface R+D is total distance from center of masses ****** One Dimension...
  17. M

    What are the units for the Universal Gas Constant?

    Homework Statement Hello, I am not asking for the answer to an example, rather how the book got some numbers. The problem is an example from the book and shows me the solution but does not show the steps. Given: The compressed air tank has a volume of .84 ft^3. The temperature is 70 F and the...
  18. AaromTheBritt

    I Remembering Lenz's Law: An Easier Way?

    I'm working on induction at the moment, and the math makes sense, but Lenz's Law is giving me trouble. Does anyone have an easier way (relatively) of remembering the directions of emf? Any advice is appreciated.
  19. D

    B Kepler's Law of Areas: Radially Directed Force

    Hi, Just wanted to know how can we attribute the kepler's law of areas to a radially directed force?
  20. C

    Kepler's Law for finding velocity

    Homework Statement [/B] I need to help solving part a) Homework Equations [/B] $$v= \frac{2\pi}{T}$$ $$(\frac{T_1}{T_2})^2 = (\frac{r_1}{r_2})^3$$ The Attempt at a Solution I'm not sure where to begin really. One approach I tried was getting T_1 in terms of v_0 and plugging it into...
  21. Fips

    Understanding Biot-Savart's Law for a Rotating Disc with Current Density

    Homework Statement There's a disc with a current density surface σ, with radius R and angular velocity ω Find the B Homework Equations α = vσ=ωrσ The Attempt at a Solution I'm having problems understanding why the cross product gives αr
  22. pesslovany

    Application of Gauss' law - point charge in hollow sphere

    Firstly I appologize, that I am not native english speaker and I don't study physics(but cybernetics we are getting just some general knowledge about physics), but hopeffuly I will write this right. Homework Statement We know that inside of a conductive object is protected from influence of...
  23. J

    Struggling to understand what Faraday's law says

    Faraday's law talks about the change in the flux through a loop, but I never see how people take into account the change in the flux due to Faraday's law itself and I am wondering if that leads to a contradiction. For example when calculating the current through a physical loop with area A and...
  24. K

    I Question on convention - R vs r using universal law of grav.

    I have a question on convention regarding the universal law of gravitation formula. Sometimes the distance is represented with the lowercase r and sometimes with the uppercase R. Why is it listed two different ways? I am thinking that r is the total distance and R is the radial distance, no...
  25. ChloeYip

    Calculating Hydrogen Mass from Ideal Gas Law

    Homework Statement (introduction course of university physics) A 25- L container holds ideal hydrogen (H2) gas at a gauge pressure of 0.25 atm and a temperature of 0°C. What mass of hydrogen gas is in this container? The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R =...
  26. Z

    Gas Law applying to air vs water vapor

    Say we have a tire filled with air (equal to ambient air surrounding it in every way). pressure on the gauge is 0. Then, we pressurize it to 1 ATM (15psi). If we heat the tire , the air will be heated and expand based on gas law, or is there a factor that changes it based on the air's...
  27. bland

    Rice University gets Newtons 3rd Law wrong

    I couldn't remember which number was which in Newton's laws of motion, and so I clicked the first link I found, but to my amazement it seems that while Rice University got the number right, they got the facts of how it works wrong. Ironically it seems they have made the same mistake as that...
  28. Alex Katko

    Is My Solution for the Kirchov's Current Law Differential Equation Correct?

    Homework Statement Using Kirchov’s Current Law (KCL) at the top node of the circuit, write the differential equation for the membrane voltage (Vm). Solve for Vm(t) symbolically,assuming that all other voltages, all resistances, and the capacitance are constant Homework Equations Current law...
  29. MetaUniverse

    3 basic question about Coulomb's Law

    Hello everyone! I'm currently trying to calculate electric forces between two objects, so for that I of course need Coulomb's Law. I understood its equation (etc.), but there are 3 things that I haven't found out yet: -How exactly can you find out or calculate what amount of charge an object...
  30. F

    Torricelli's law and pressure at the drain

    Hello Forum, The speed of water exiting from a side narrow hole at depth h in a large bucket is given by ##v=\sqrt{2gh}##. This result is obtained applying Bernoulli's equation along a streamline that goes from the top free surface to the drain on the side of the bucket at depth h. The water...
  31. e2m2a

    B The Uniquess of the Law of Cosines

    Is the law of cosines the only equation that expresses the relations between the sides and angles of a triangle? (Other than the law of sines). For example: Suppose we have a triangle and sides a,b and the angle opposite of c is known. Then invoking the law of cosines, we know that c sq = a...
  32. N

    Bernoulli's law in a network of a tube and a reservoir

    Homework Statement I am looking at the following system: It shows a pore/tube (B) which is attached to a reservoir A. The fluid in reservoir A has a non-zero velocity in the horizontal direction, but I assume that the tube B is so long that the velocity there is unaffected and still zero...
  33. Ali Hamaiz

    Law of conservation of momentum in a non isolated system.

    Is the law of conservation of momentum valid in non isolated system . What is an isolated system? My teacher confuses me that the law is valid in an non isolated system . They even say that when we say about the isolated system (meaning they are present ) we do not consider the air resistance...
  34. V

    Kepler's first law for any body

    I was just wondering, what if an object is placed in our solar system, will it revolve around the sun? If yes, will it have a centripetal acceleration too?
  35. D

    Violation of conservation law?

    Consider two objects, "A" and "B", each having mass 1kg. Object "A" moves downward towards object "B" and collides with the extended arm of object "B". Let's say for the sake of argument that during this collision object "A" lost one unit of momentum and 0.5 joules to object "B" (This value does...
  36. M

    Trying to Calculate k, using Hooke's Law

    Homework Statement The position of a 49 g oscillating mass is given by x(t)=(1.8cm)cos12t, where t is in seconds. Homework Equations k=mg/x The Attempt at a Solution I've tried working this problem multiple different ways and it is just not working for me. I used k= (.049*9.8)/.018 Is this...
  37. F

    Exploring the Effects of Lenz' Law and Magnetic Flux: Is Ferromagnetism the Key?

    Why is it that the induced emf opposes the change in magnetic flux? Is it to follow the law of conservation of energy?
  38. K

    Snell's law and inverse function

    Homework Statement Snell's law is: $$\frac{\sin\theta_1}{c_1}=\frac{\sin\theta_2}{c_2}$$ $$\frac{c_1}{c_2}=n_{12}$$ Express ##\theta_2## as a function of ##\theta_1## Find the largest value of ##\theta_1## for which the expression for ##\theta_2## that you just found is...
  39. H

    Coulomb's Law in Two Dimensions

    Homework Statement Three charges, q1, q2, and q3, lie in a plane, as shown below. Find the net force on charge q2 (please refer to attachment for diagram) Homework Equations F= k x q1q2/R^2, knowledge of trig functions and separating x and y components The Attempt at a Solution So I found the...
  40. X

    Show by using Torricelli's law

    A cone-shaped water tank is given by V(h)=\pi(h-\frac{h^2}{3}+\frac{h^3}{27}) Show using Torricelli's law law that -2\sqrt2\pi(\frac{1}{\sqrt{h}}-\frac{2}{3}\sqrt h+\frac{1}{9}h^{3/2})\frac{dh}{dt}=1 What I have done so far: V'=\frac{1}{9}\pi(h-3)^2h'
  41. R

    MHB Find General Form of Z & T: Newton's Law of Cooling

    A cup of tea is removed from the fridge and left on a desk. The temperature of the room is constantly E and T(t) represents the temperature of the tea after t minutes. dT/dt = K(E-T) Z(t) = E-T(t) How do I find the general form of Z and T?
  42. A

    Conservation law form of Navier Stokes Equation

    I am pretty confused about how to write Navier-Stokes Equation into conservation form, it seems that from my notes, first, the density term with the pressure gradient dropped out. and second, du^2/dx seems to be equal to udu/dx. Why is it so? I attached my notes here for your reference.
  43. Gh. Soleimani

    Newton's Law of Cooling and Resonance Phenomena

    Can we find the natural frequency of water's molecules by using of Newton's law of cooling and resonance phenomena?
  44. R

    Engineering Understanding Independent Currents in a Circuit

    Homework Statement This problem is Problem 2.24 from Fundamentals of Electric Circuits (5th edition). The problem is as follows: Homework Equations KVL, KCL The Attempt at a Solution In the official solution, they assume that the total current in the lefthand loop is ##I_o##, whereas the...
  45. Z

    Snell's law and law of reflection derivation -- confusing

    I am learning principle of optics written by Born&Wolf and confused with the method to derive Snell's laws and law of reflection. In the textbook,##v_1## is the speed of light in mediator 1 and ##v_2## is the one in mediator 2. ##{\vec s}## is the direction of light and ##{\vec r}## is the...
  46. A

    Calculating exerted pressure ( gas law lab)

    Homework Statement Mass =0.908kg Area= 5.3 x 10^-4 m^2 2. Attempt This was for a lab I am doing on gas laws. Its asking to calculate exerted pressure in kPa. This is what I've done so far : F= 0.908kg * 9.8m/s^2 = 8.8984N Pressure = Force/ Area Pressure= ( 8.8984N) /( 5.3 * 10^-4...
  47. Kianlos

    Law of conservation of energy problem [reupload]

    Homework Statement THIS PROBLEM CONSISTS OF NOTHING MORE THAN WHAT IS BEING STATED (NO VALUES, NO EQUATIONS, NOTHING) THIS IS A WORD PROBLEM WHERE NO CALCULATIONS ARE TO BE MADE: A mass hangs from a vertical spring and is initially at rest. A person then pulls down on the mass, stretching the...
  48. S

    Applying Snell's Law Inside & Outside a Prism

    Homework Statement I'm having trouble / uncertainties about the third missing angle (from left to right) in the picture. The first angle of reflection was easy as it's just 34 degrees as well and I used snell's law rearranged to find the first angle of refraction as 13.36 degrees from the...
  49. B

    First Vs. Second law of thermodynamics

    Hello Pf's members Suppose we isolated a methane's molecule at a room with 213 kelvin. According to second law, methane's molecule tends to break it's bond for reaching whole system (methane's molecule and surroundings) to maximum entropy. On the other hand for breaking these bonds we need...
  50. J

    I Who wrote the law: Wc = - delta U ?

    My history of physics is all too rusty. Who first wrote that the work done by a conservative force is the negative of the change in potential energy? Was he/she also the one who first presented the equation?
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