Laws Definition and 1000 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. A

    Problem with Newtons Laws of Motion

    Homework Statement There are 2 blocks, one of mass m kept over other of mass 2m. Pls. refer to the diagram. The question is : the minimum value of u (coefficient of friction) between the 2 blocks for no slipping is : (a) F/mg (b) F/3mg (c) 2F/3mg (d) 4F/3mg My answer is coming as (b) but...
  2. Q

    Understanding the Invariance and Limitations of Conservation Laws

    It seems to me that there is a difference between, say, the law of conservation of linear momentum or energy and the law of conservation of angular momentum. The first two are valid in any frame of reference and their invariance is a direct consequence of the relativity principle, whereas...
  3. J

    Newton's Laws, bungee jump problem

    Please help me with this problem. many thanks :) A 55-kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion. Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a...
  4. J

    Help, please on vectors and Newton's laws

    Hello :) This is my question: A 325-kg boat is sailing 15 degrees north of east at a speed of 2 m/s. Thirty seconds later, it is sailing 35 degrees north of east at a speed of 4 m/s. During this time, three forces act on the boat: a 31 N force directed 15 degrees north of east (due to an...
  5. N

    Question Related to Newton's Laws of Motion

    1. A fully loaded Saturn V rocket has a mass of 2.92 x 10^6 kg. Its engines have a thrust of 3.34 x 10^7 N. a. What is the downward force of gravity on the rocket at blast-off? b. What is the unbalanced force on the rocket at blast-off? c. What is the acceleration of the rocket as it...
  6. M

    Not really understanding Gravitational Potential energy or Kepler's laws?

    Hey, I have a test tommorow and I don't really understand gravitational potential energy or kepler's laws. It's not really a theory test, it's the math aspect, but I still don't understand it. I know of the formulas such as Fg=Gm1m2/r^2, Eg=Gm1m2/r, Ek=1/2 mv^2, and I think that's all. But...
  7. T

    Newton's Laws question : On springs and pulley system

    A Particle is attached by a string to a point in a rough inclined plane of elevation \theta. Co-efficient of friction is \mu. Originally, the string is unstretched and lay along the line of greatest slope.Prove that the condition for particle to oscillate is \mu < 1/3tan\theta. Note : Tension...
  8. N

    Solving Exponent Laws: 2^3 / 2^0 - 2^-1 Question on Homework

    Homework Statement 2^3 / 2^0 -2^-1 Homework Equations solving using exponent laws The Attempt at a Solution i move the negetive one over and make it 2^3 /2^0 = 1/2^1 I get 8 on the left side, and 2 on the right, bring the 6 from the right to the left and get 2. The answer is...
  9. M

    Calculating Block's Backward Pull in Physics Problem?

    Hey, I have a question I'm stuck on for my grade 12 physics class. There is a block being pulled by tension over a triangle essentially that's at a degree of 35.7 (right angle triangle). I understand the whole question but I don't understand how to find how much pull the block has backwards of...
  10. O

    Kirchhoff's Three Laws of Spectroscopy

    Kirchhoff's Three Laws of Spectroscopy are as follows. 1. An incandescent solid, liquid, or gas under high pressure, emits a continuous spectrum. 2. A hot gas under low pressure emits a "bright-line" or emission-line spectrum. 3. A continuous spectrum source viewed through a cool, low-density...
  11. P

    How to Find Force F on a Boat with Given Forces and Motion?

    A 325-kg boat is sailing 15.0° north of east at a speed of 2.00 m/s. Thirty seconds later, it is sailing 35.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.0N force directed 15.0° north of east, a 23.0N force directed 15.0° south of west and F Find...
  12. M

    Net Force on Log: Solving Using Cosine & Sine Laws

    Homework Statement Two ropes are attached to a log that is floating in the water. A force of 80.0 N is applied to one rope and a force of 60.0 N is applied to the other rope, which is lying at an angle of 40° from the first rope. What is the net force on the log? We know that the angle...
  13. W

    What will happen to the crate of eggs when a truck makes a sharp left turn?

    A truck driver is carrying a crate of eggs to a local gorcery store. When the driver gets off the highway, he makes a sharp left turn. According to Newton's Laes, what will happen to the crate of eggs? a. The crate will slide to the right in the truck. b. The crate will slide to the left in...
  14. T

    Find the ratio (ideal gas laws) how to get a Ratio between two numberS>

    Homework Statement The temperature of a fixed mass of gas drops from 127 C to 27 oC under constant pressure. Find the ratio of the new volume to the original volume. C. 3:4 D. 4:3 E. 1:1 A and B arent here because i have gotten them wrong. Homework Equations Ideal gas law: PV=...
  15. O

    Did the basic laws of physics also evolve after BB?

    Just thinking about this and I will say I do not know anything about cosmology or physics beyond what is common, but my question is, could the laws of physics, specifically how particles interact/behave, have evolved right after the big bang so that it started out with a simpler set of laws and...
  16. F

    Questions on dynamics - Newton's laws of motion

    1. A chain of mass M and length L is suspended vertically with its lower end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of the chain x has fallen? You may neglect the size of the individual links. 2. A smooth wedge, whose...
  17. V

    Solving the Elevator's Acceleration: Examining Newton's Laws

    Homework Statement An object is placed on a scale in an elevator which reads 8kg at rest. This scale shows 9.2kg when the elevator accelerates. What is the direction and magnitude of the elevator's acceleration. Homework Equations F=MA, F=MG, Fnormal=m(a-g) The Attempt at a Solution...
  18. M

    Physical laws and tensor formulations of them

    Hi, I am reading up on special relativity and I'm having some trouble understanding how tensors fit into the picture. Its my first contact with these concepts so please forgive me for being very muddled. My main problem is understanding how to see whether a physical law is compatible with...
  19. D

    Use of solving complex DC circuits with Kirchhoff's laws

    Hello, in an introductory course on electricity, it is typical to use Kirchhoff's laws to write a system of equations for a complex circuit having several known emfs and resistors from which the unknown currents are then found. Is this something electrical engineers sometimes do in their work...
  20. P

    Can kirchoff's laws be used to analyze simple parallel/series

    can kirchhoffs laws be used to analyze simple parallel/series combination of resistors?
  21. A

    Faraday's & Ampere's Laws: Conditions of Independence

    Under what conditions is Faraday’s Law independent of Ampere’s Law? I want to say that this is so only in the static case, however this isn't right (or at least there's more to it). What am I missing?
  22. Q

    Conservation Laws vs a Spinning 'Disk Brake'

    A while back I piggy-backed onto another thread (and then withdrew it as being out of place) an example of a system possibly violating the conservation of energy and momentum (angular momentum directly) - a spinning hollow right circular cylinder placed under frictionless axial compression. Many...
  23. B

    How does the concept of mass-energy equivalence relate to conservation laws?

    Hi How many conservation laws are there ? 1. Conservation of energy 2. " " momentum 3. " mass 4. " charge ? TIA
  24. P

    Trouble with Log Laws and exponential functions

    Please help i have these two questions and i am Stuck! Question 1 The linear equation you have found (y=.771x+1.609) is in the form of y= mx +c. it should be however more appropreiatly be considered as being in the form, lny = mx + lnA. by using appropriat logarithmic and exponential laws...
  25. M

    Conceptual question: Newton's Laws

    Suppose you have a can (like a spray can) in a vacuum. You poke a hole in the can and the pressure from the can pushes it to the right. Now suppose you have a vacuumed can within a pressurized container and then you poke a hole in it. Which way (if at all) does it move? I know this is sort of...
  26. K

    How Does Binary Star Mass Affect Orbital Period Calculation?

    In a certain binary-star system, each star has the same mass as our Sun, and they revolve about their center of mass. The distance between them is the same as the distance between Earth and the Sun. What is their period of revolution in years? T^2=(4pi^2/GM)*r^3 I know that the mass of the sun...
  27. A

    Newton's Third Law and Tractor Movement

    Homework Statement A tractor is pulling a heavy weight behind it by a rope. If, according to Newton's third law, the load is pulling back as hard as the tractor is pulling forward, then why does the tractor move? Something else I don't really get: A fishline will break when a force of more...
  28. bcrowell

    Sum over histories, including histories that violate conservation laws?

    It's been 20 years since I took field theory in grad school, and I didn't really understand it all that well even then, so I'm basically looking for a very low-level explanation of the following issue... In the sum-over-histories approach, there is the question of which histories to include...
  29. N

    BOLTZMAN'S cONSTANT and Thermal laws.

    Homework Statement A cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 121 C. Boltzmann’s constant is 1.38066 × 10−23 J/K, and Avogadro’s number is 6.02 × 1023 mol−1. What is the average kinetic energy of each type of molecule? Answer in units of J...
  30. M

    Solving a Complex Circuit Problem with Kirchhoff's Laws

    Please see attachment for problem. I know Kirchhoff laws and resistors in parallel and series but how do you solve this?
  31. G

    The Laws of Physics: Fundamentals or Variations?

    are they fundamental (like the atom was considered to be)? Or might they vary from one region to another?? Might there be an infinite amount of regions with an infinite amount of laws? Does a similar possibility hold for universal constants?
  32. I

    Conceptual Question [Newtons Laws]

    When you sit in the passenger seat, why do you feel pushed up when you make a left turn? Explain using Newton's laws of motion.My Guess: Newtons third law states there is a reaction for every action. So when you turn left the opposite reaction would be you turning right? IDK LOL :|
  33. M

    Exploring the Similarities of Energy Laws Across Different Branches of Physics

    Hello I've been wondering a lot of why many laws of energy in different branches of Physics seem similar, for example: Kinetic: \frac{1}{2}mv^{2} Spring: \frac{1}{2}kx^{2} Rotational: \frac{1}{2}I\omega^{2} Capacitor: \frac{1}{2}VC^{2} Capacitor: \frac{1}{2}eE^{2} Magnetic...
  34. A

    Relating Homework problems to Newton's laws

    Hi guys, I realize this can be a rather uncanny occurance when a new member's first post is to ask for physics help on his homework but I've been lurking around the forum here for a while and am now in a really tight spot and thus had to get over myself and finally make an account...
  35. O

    Determining X Value with De Morgan's Laws - Need Help

    is known that A and B are events. now i asked to decide form the options A-D which one can have the X value. so i tried to use the De Morgan's laws but i am not sure if this is the correct way. so i need help here. thanks.
  36. P

    Is This Scenario Demonstrating Newton's Third Law of Motion?

    Let's say there's two people, A and B. Person A hits person B and person A gets pushed back more than person B does. Would be that be exhibiting Newton's Third Law of Motion of Newton's Second Law of Motion?
  37. J

    Newton's laws, finding acceleration and force

    Homework Statement A large football player student (1.0 x 10^2 kg) applies a 6.0 x 10^2 N force to another equally burly student (1.0 x 10^2 kg) sitting on a sled (13.2 kg). If sliding friction and air resistance (drag) is 99.5 N, find the acceleration of the sled. In addition, how much...
  38. S

    New to physics and with Newtons laws

    What force is required to accelerate a 10g bullet from rest to 200m.-1 in a rifle barrel 50cm long i don't need the answer just how to work it out
  39. M

    Need extra practice for Newton's laws?

    Does anyone have a good website for some questions/answers for Newton's three laws (I'm not sure if he made more, but the inertia, the net force must be zero when something is not moving, or moving at a constand rate, and the for every action there's a reaction). I've got a test tommorow, and I...
  40. S

    Keplers laws and kinetic energy

    Homework Statement As part of my coursework I've had to show that kinetic energy can be written in a certain way. As a cheat I used this as a starting point and worked my way back to the following equation Kinetic energy = \frac{1}{2}m\dot{r^{2}} + \frac{1}{2}mr^{2}\dot{\theta}^{2} r dot is...
  41. S

    How Do Newton's Laws Apply to Everyday Motion and Animal Adaptations?

    Homework Statement Sorry to bother, but I was working through some homework I haven't done (I put a * next to ones I didn't get and I just wanted to post them because I have no idea how to do them): 1. If you are on a bus that is traveling along a straight, level road at 100 km/h, you are...
  42. P

    Concept questions - Laws of Motion

    Homework Statement Newton's 1st Law of Motion A ball rolled across the top of a pool table and slowly rolls to a stop. How would Aristotle interpret this behavior? Galileo? You? Newton's 2nd Law of Motion If a heavy person and a light person parachute together form the same altitude, and...
  43. I

    What Force Allows a Balloon to Float in the Air?

    As the balloon rises, the force of gravity pulls on the balloon, but which force is strong enough to pull the balloon up so that it floats in the air? thanks
  44. Z

    Question regarding a contradiction in conservation laws

    We all know that the universe is expanding and for that matter accelerating. Science is now starting to realize that the universe will expand forever and the big crunch will never occur due to recent data of a supernova. My point to all this is, quantum theory states that a vacuum must always...
  45. P

    Absorption of Photon by a Free Electron - Impossible - Conservation Laws?

    Hey, It seems like this is impossible because momentum conservation is violated. I had a Q where an electron underwent an energy transition and emitted a photon, and then they asked whether it was possible for the photon to be reabsorbed by the electron to undergo the same transition as...
  46. B

    Kirchoff's Laws to find all currents flowing in the cct

    1) Using Kirchoff's Laws, find all the currents flowing in the cct. 2) Hence, determine the voltages across all resistors and check that each loop complies with KVL
  47. J

    Work (Conservation of Energy/Newton's Laws)

    Homework Statement MP 11.44 Sam, whose mass is 75kg, straps on his skis and starts down a 50-m-high, 20degree frictionless slope. A strong headwind exerts a horizontal force of 200N on him as he skies. Find Sam's speed at the bottom (a) using work and evergy (b) Using Newton's laws...
  48. ThomasMagnus

    How can the window washer move at constant velocity with unbalanced forces?

    A window washer pulls himself upward using the bucket pulley apparatus shown. How hard must he pull downward to raise himself at a constant speed? The mass of the person and the bucket is 65kg. My attempt: When doing pulley problems, I like to set 'moving to the right' as positive. In this...
  49. J

    How Do You Calculate the Coefficient of Kinetic Friction on an Inclined Slide?

    Homework Statement A child slides down a slide with a 34 degree incline, and at the bottom her speed is precisely half what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child. Homework Equations \SigmaF...
  50. K

    Solving for a Train Without Knowing Mass

    A train is traveling up a 3.73 degree incline at 3.25 m/s when the last car breaks free and begins to coast without friction. A) How long does it take for the last car to come to rest momentarily? B) How far did the last car travel before coming to rest? Newtons Second Law I know...
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