What is Laws: 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. zonde

    Can we model classical world using quantum laws?

    In QM there is no cloning theorem that says "we can't clone or erase quantum state". But in classical macro world we can copy information and erase it. If we should describe classical information as a very complex quantum state then we shouldn't be able to copy or erase it, right? And obviously...
  2. K

    Newton's laws Pulley Problem

    Homework Statement A monkey which has a mass of ##m## is hanging on a rope as the picture shows. Then the monkey starts to move upwards with speed ##u##. Find how the box which has a mass of ##2m## will move. Neglect friction between the rope and pulleys. Assume that pulleys are massless...
  3. 1

    The Conservation Laws - Particle Physics

    Homework Statement Question: Figure 1: QUESTION ABOVE. Homework Equations The Attempt at a Solution :[/B] P + P → K+ + K- + P + P Firstly, I just wanted to check that this is correct. I found the answer pretty quickly by googling it but have since spent a long while trying to understand...
  4. C

    Railgun and the laws of physics

    I just made a rail gun using two ring stand poles, a steel ball, and a car battery. Maximum velocity is about 5 cm/sec. What is strange is that it is shooting the wrong way. Defying the laws of physics and right hand rule. Any ideas ?
  5. A

    Finding Currents Using Kirchhoff's Laws

    Homework Statement a. Determine the currents I1, I2, and I3 in the above figure. Assume the intermal resistance of each battery is r = 2.48Ω. Homework Equations Kirchhoff's Laws (Junction Rule and Loop Rule) The Attempt at a Solution Using Kirchhoff's Laws, I ended up with three equations...
  6. armand

    Why are the forces in Newton's 3 laws equal, but not in hydraulic systems?

    Hi Mentor i am in little confusing about force, according Newton third law force on action and reaction is equal but according hydraulic system are not equal. https://www.facebook.com/photo.php?fbid=1749685448591067&set=pb.100006488851023.-2207520000.1429362639.&type=3&theater Thank you for...
  7. zonde

    QM laws fundamental vs effective

    I have impression that physicists consider QM laws as fundamental, meaning that there should be a way how QM mathematical form is realized in reality. On the other hand QM laws could be effective laws resulting from some process of evolution. In that case it should be possible to characterize...
  8. M

    How Do You Calculate Forces in a Multi-Block System with Friction?

    Three identical blocks are pushed across a table at constant speed. The hand pushes horizontally. Let the stack of two blocks be system A and the single block be system B. Now suppose the mass of each block is 2.5kg, the coefficient of kinetic friction between the bottom surfaces of the blocks...
  9. C

    Quantum Mechanics is a set of Laws

    Hi, I know this is a basic question however, I am seeking absolute verification on these two points. 1) Quantum Mechanics is a set of Laws. 2) Laws only describe what we see. Theories give us the reason behind them.
  10. D

    Homework Help on Kirchoff's Laws and Magnetic Induction

    Homework Statement I am stuck on 2 and 3. I attached all the problems and variable and unknownsHomework Equations I attached my work for 1, 2, and 3. I'm not sure if it is right though. [/B]The Attempt at a Solution Can someone check my work for problems 1, 2, 3 and 4? The equations...
  11. S

    Proof to Kepler's first and second laws

    I am a 10th grade student, and I tried for a few weeks now to find a proof to Kepler first and second laws. Is there a simple proof to Kepler' s laws?
  12. L

    Galilean Relativity and Newton's Laws

    I'm a little bit confused about the relationship between Galileo's Principle of Relativity and Newton's Laws. Indeed, as I understand, the Galilean Principle of Relativity is what Galileo presented with Salviatti's ship discussion. The discussion seems to lead to a simple idea: "if one performs...
  13. V

    Faraday's vs Ampere's Laws and current density

    Greetings all, I know that Faraday's and Ampere's law are related by M.E., but can I say the following? By Faraday’s Law, a time varying magnetic field induces an electromotive force, which produces an electric current density in a media. Up until EMF, that's Faraday's, but is the rest of...
  14. C

    AreKirchoff's laws of Current and Voltage interchangeable?

    Specifically the equations you get when you examine the loops in a circuit.
  15. S

    Scientific Laws for Engineering Materials

    I have a conceptual question. There is a law in science for every phenomenon in nature, like gravity or electric field. But also there are laws for springs or capacitors etc... I mean the engineering materials that are produced by engineering processes, not can be found in the nature itself...
  16. N

    Gas laws: calculating total volume

    Homework Statement 5 lbs of nitroglycerin detonates. What is the total volume of the gases produced? Homework Equations PV=nRT The Attempt at a Solution I used the balance chemical equation of the decomposition of nitroglycerin and used stoichiometry to find the number of moles of nitrogen...
  17. andro

    Analytical formulation of Newton's Laws

    Greetings historians of physics! Newton's Principia is written almost entirely using geometrical proofs and diagrams, barely using any calculus at all. It is thought that Newton was reluctant to use his calculus in this work, fearing that it would undermine its credibility and reception, since...
  18. F

    Why do we take component of v1 along the string in Newton's laws homework?

    Homework Statement Homework Equations None... Newton's laws The Attempt at a Solution Not the attempt, the entire solution is: String length is constant...hence if on the right side of the pulley, the string goes up by x distance then on the right side also the string goes down by x...
  19. T

    Bernoullis from the laws of motion

    I am trying to understand Bernoullis from Newton laws applied to molecular dynamics (as opposed to conservation laws) From the conservation laws I understand for a incompressible invicous (experiencing no friction effects ) Ideal fluid Mass is neither created nor destroyed Mass in = Mass...
  20. N

    Electrons and Consequences of Conservation Laws

    Hi Guys, I was wondering; if electronic charge is conserved by Kirchoff's Current Law, then does this mean that the total number of electrons traversing any given circuit at any time is constant?
  21. K

    What is the man's upward acceleration when hoisting himself into a tree?

    Homework Statement To hoist himself into a tree, a 72 kg ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. He then pulls downward on the free end of the rope with a force of 358 N . Neglect amy friction between the rope and the branch, and...
  22. K

    Calculating Coefficient of Friction for a Crate on an Inclined Surface

    Homework Statement A 225 kg crate rests on a surface that is inclined above the horizontal at an angle of 20o. A horizontal force (F = 535 N parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of friction between the crate and...
  23. K

    Forces and Newton's Laws of Motion

    Homework Statement The drawing shows a large cube (mass = 25 kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (msmall = 4 kg) is in contact with the front surface of the large cube and will slide downward unless P is sufficiently large. The...
  24. E

    Calculating the Force Constant of a Bungee Cord Using Newton's Laws

    Homework Statement You've attached a bungee cord to a wagon and are using it to pull your little sister while you take her for a jaunt. The bungee's unstretched length is 1.3m and you happen to know that your little sister weighs 220N and the wagon weighs 75N. Crossing a street, you accelerate...
  25. carllacan

    Relationship between Bit-Savart and Ampere laws

    I've tried to relate Biot-Savart's Law to Ampere's and I've found a contradiction, which I guess is due to a naive use of Ampere's. If ## \int \vec B · d\vec l = \mu_0 I_{enc} ## is applied to a circle of radius R around a current element ##Id\vec l## we have ## B·2\pi R = \mu_{0} I_{enc} ##...
  26. M

    Kirchoff's Laws for Currents in a Circuit

    Homework Statement Determine the magnitudes and directions of the currents through each resistor shown in Fig. 19-38. The batteries have emfs of http://www.webassign.net/images/scriptE.gif1 = 9.0 V and http://www.webassign.net/images/scriptE.gif2 = 17.0 V and the resistors have values of R1 =...
  27. M

    Kirchoff's Laws Current [Problem 1]

    Homework Statement Determine the currents I1, I2, and I3. R5 = 18http://www.webassign.net/images/omegacap.gif. Assume the internal resistance of each battery is r = 1.0 [PLAIN][PLAIN]http://www.webassign.net/images/omegacap.gif. Homework Equations Kirchoff's Loop Rule: I1+I2+I3=0 Kirchoff's...
  28. Diego Fernandez

    Calculating Net Force results in a final velocity

    Homework Statement As simple as the question may seem, I require some honest help. I'm particularly new to physics. The question is the following: A net force of magnitude 4.0N acts on a body of mass 3.0kg for 6.0 s. The body is initially at rest. Which of the following is the speed of the...
  29. C

    Proving Limit Laws: Epsilon/Delta Definition

    Homework Statement Prove that \lim_{x->a}[f(x)+g(x)]=\lim_{x->a}[f(x)]+\lim_{x->a}[g(x)] Homework Equations Epsilon/delta definition The Attempt at a Solution The book says: Let the limit of f(x)=L and the limit of g(x)=M. Then, \mid f(x)-L \mid<\frac{\epsilon}{2} whenever 0<\mid x-a...
  30. E

    Can a Thermos Truly Keep Water Hot Forever?

    If you keep boling water in thermos It remains hot up to 3-4 days. Let's say you can create a thermo where no heat can escape outside. Does the water remain hot for decades? Or does it get cold even if heat does not escape? And why? What is the corresponding laws of thermodynamics about thermal...
  31. C

    MHB Using Log Laws and values to compute this compution

    Using logs to compute the following, to the four-figure accuracy. $\frac{.009292}{(\sqrt[3]{582400}+14.23)}$ Let N=$\frac{.009292}{(\sqrt[3]{582400}+14.23)}$, then $\log\left({N}\right)=\log\left({\frac{.009292}{(\sqrt[3]{582400}+14.23)} }\right)$. Log N=...
  32. B

    Laws of Motion topic -- Car being decelerated by a headwind

    Homework Statement A car with mass 2500 kilograms travels along a straight level road at 90 km/h. A headwind begins to blow with a force of 200 N causing the car to slow down. Calculate the car’s deceleration. Homework Equations The book uses the formula F =ma so 3. Book's solution = 0.08...
  33. G

    Laws of thermodynamics compared with life.

    Dear friends! I had read about a comparison of laws of thermodynamics as follows. " If energy extraction is a game. First law: You cannot win the game. Second law: There is no break even. Third law:You can not leave the game". My problem is that I cannot convincingly understand the comparison...
  34. G

    How can we sure that physical laws are always the same in al

    How can we sure that physical laws are always the same in all the universe?
  35. Wajdi Al-ashi

    Do Newton's Laws Explain Motion and Inertia Anomalies?

    Q1: Are objects at rest or are they in a uniform motion along a straight line in the world and in the universe? Q2: Why does an object with an important inertia not move if I apply to it suddenly a big force (accelerate it rapidly)? And on the other hand, the same object does move with a small...
  36. TheNerdConstant

    Could new physical laws be created for large systems?

    What i basically mean by this is that at this point in time we have classical and quantum physics, both need a different set of rules to describe their phenomenon due to the size of their appropriate systems why is this and does that mean we could also say the same for immensely large systems...
  37. L

    Induced Electric Fields: Exploring Gauss' & Lenz's Laws

    In electrostatics, ∇ × E = 0 so E that is a conservative field and there must be sources of E from which E flows. We know that this sources are the electrical charges given by Gauss' Law. But when B changes in time, ∇ × E = - ∂ B / ∂t. Now the Gauss' Law no longer applies and if there are not...
  38. koustav

    Derivation of Wiens Displacement & Distribution Laws from Thermodynamics

    derivation of wiens displacement law and wiens distribution law from thermodynamic principle.but not from Plancks law
  39. R

    Newton's laws question -- a car coasts to a stop on a level road

    Homework Statement A 1490 kg car is is traveling at a speed of 22.2 m/s when the driver let's the car coast on a level road. The friction on the car slowing it down is 288 N. How far will the car coast? Homework Equations f=maThe Attempt at a Solution i can find the force but i cannot find...
  40. S

    Where Can I Find Comprehensive Notes on Kirchhoff's Laws?

    Any one who can help me to get notes on Kitchoff's laws so i can understand them well
  41. S

    Asteroid Orbits: Finding r with Kepler's Laws

    Homework Statement An asteroid of mass m is in circular orbit of radius r around the sun with speed v.It has an impact with another asteroid of mass M and is kicked into a new circular orbit with a speed 1.5v.What is the radius of the new orbit in terms r?[/B]Homework Equations (v1)^2/(v2)^2 =...
  42. H

    Help with Newton's second and third laws

    Homework Statement Two blocks are pushed to the right so that they move together with increasing speed. Block B remains at the height shown. Ignore friction between the ground and block A but not between block A and block B. The mass of block A is 10kg and the mass of block B is 2kg. Let...
  43. H

    Kirchoff's Laws Giving Singular System

    Hi, I'm trying to use Kirchoff's voltage law to find a system of equations which I can use to find I1, I2, I3, I4, and I5; which are the respective currents going through each resistor in the image. I have 5 unknowns so I need to find 5 non redundant equations. The problem is, every system...
  44. Alexandre

    What's the difference between principle, law, rule, theorem and equation?

    Well, I do understand what mathematical theorem means, and I also know what differential equation is but I don't really get why sometimes certain things are called "equations" instead of "law" (Maxwell's equations, nobody calls it Maxwell's laws) and conversely some equations are called laws...
  45. Sol_Engineered

    Should same values of currents be used in Kirchoff's laws?

    Homework Statement See above diagram for full details of the circuit Variables used: Assumption: direction of current is clockwise and the loops are positive in clockwise as well. Current through 1000 ohm=i1 Current through 4700 ohm-i2 Current through 2200 ohm=i3 Current through 1200...
  46. Robyn Gibson

    Gas Laws -- An astronaut breathing presurized air

    Homework Statement An Astronaut on a spacewalk has an oxygen tank strapped to his suit. The oxygen in it is pressurised to 5 atmospheres (5x10^5 Pa), and the volume of the tank is 15 litres. a) The oxygen is pumped to his mouth at atmospheric pressure (1x10^5 Pa). What is the maximum volume of...
  47. J

    No, this is not correct. See my previous post.

    Homework Statement A truck (1200kg) is traveling south at 22m/s a) what is the net force required to bring the truck to a stop in 330m? b) what is the cause of this net force? (im assuming the answer is friction due to brakes) Mass= 1200kg (1.2*10^4) Velocity= 22m/s [south] What force is...
  48. A

    What if Newton's laws were shifted by one time derivative?

    What would be some important properties of a universe where Force = Mass * Jerk and objects stay in constant acceleration until acted upon by a net force? (if we ignore the fact that objects would reach the speed of light, and just deal with classical mechanics)
  49. L

    Why does a skateboard move backward when you push on it, but the Earth does not?

    Use Newton's to explain : When you take a step, you push down and back on the Earth and the Earth pushes up and forward on you. When you step on a skateboeard, the skateboard moves backward as you push down and back. Why does the skateboard move backward while the Earth does not even if the...
  50. J

    Newton's Laws Conceptual Problem

    Homework Statement "Normally, jet engines push air out the back of the engine, resulting in forward thrust, but commercial aircraft often have thrust reversers that can change the direction of the ejected air, sending it forward." "When might thrust reversers be useful in practice? (Chose all...
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