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.
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...
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...
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...
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)...
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...
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
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?
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?
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...
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...
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...
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...
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...
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 =...
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]
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?
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...
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,·...
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...
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?
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 ⇒...
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...
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...
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) *...
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...
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?
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...
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...
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...
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...
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...
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
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...
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.
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...
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...
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...
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]...