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.
hello,
we have learned that according to the laws of thermodynamics that the efficiency of any machine should be less than one because of the passive components in it. in an electric heating machine all the input electrical energy is converted to heat. Does this make the electrical heater as an...
Homework Statement
"A bicyclist can coast down a 5° hill at a constant 7.0 km/h. Assume the force of friction (air resistance) is proportional to the speed v so that Fair = cv."
(a) Calculate the value of the constant c.
(b) Calculate the average force that must be applied in order to...
The other day, as I was struggling through my quantum mechanics text, I realized that the only physical laws presented in the text were the four postulates of QM, the last of which is Schrodinger's equation. These are presented around page 150. The first 150 pages establish the background needed...
Homework Statement
Using Kirchoff's laws, determine the current in each of the branches in the network shown.
Homework Equations
I have used both kirchhoffs and Maxwells circulating currents. I get the right answer with maxwell's but not sure with Kirchoffs
Maxwells is on the left...
Homework Statement
A turn in the road with a radius of 30m is banked at an angle of 40 degrees. If \mu=.75, what is the minimum and max speed a 1200 kg car can travel without sliding off the turn.
Homework Equations
F=ma, Mv^2/R, Fw = mg
The Attempt at a Solution
Alright, so...
In "The Algebra of Grand Unified Theories" http://arxiv.org/abs/0904.1556" john Baez (see page nb 9) shows how the conservation of eigenvalues (T3 isospin)
appears if there is an intertwiner between the representation spaces of the symmetry group.
I discovered intertwiners for the first time...
Homework Statement
A 54 kg woman is ice-skating toward the east on a frictionless frozen lake when she collides with a 79 kg man who is ice-skating toward the west. The maximum force exerted on the woman by the man during the collision is 160 N, west. Take east to be the positive direction of...
Are physics laws (even the laws) mathematical models of reality? Or they describe reality as it is? Are those laws just models, like for example a population's growth mathematical model (just an example that I remembered)?
A maths teacher told me that in physics everything are...
Homework Statement
People who are angry sometimes say that the feel as if they will explode. If a calm person with a lung capacity of 3.5L and a body temp of 36C gets angry, what will the volume of the persons lungs be if their temp rises to 39C.
Homework Equations
V1/T1 = v2/T2...
Homework Statement
Find :
a) acceleration of 1 kg, 2kg and 3 kg blocks and
b) tensions T1 and T2
Note: In the figure, 1, 2 and 3 represent the masses of respective blocks in Kg. T1 and T2 represent tension in strings
Homework Equations
Newton's laws and constraint equations...
What is the magnitude of the force F (assumed horizontal) required to push the block up the plane at a constant speed? Take the coefficient of kinetic friction to be 0.25. Block is 75 lb
I used Ff= mewN and found Wparallel
Did Ʃ=ma
Fapp-Ff-Wparallel= ma
but i keep getting wrong answer
I think it's a pretty simple question. Let's say we're talking about a moving elevator in which a person stands on a digital balance. The textbook tells me to treat the downward direction as positive, so the value of acceleration is 9.8 m/s^2 instead of -9.8m/s^2
I'm asked to find out the...
Hi. So if you have \frac{d p_{\alpha}}{ds} = \frac{q}{c} F^{\alpha \beta} u_{\beta} how could you possibly go on proving this its form is invariant under all coordinate transformations? Or any physical law of any form, really? I guess my point is how do you represent "all possible...
Homework Statement
what is the coefficient of friction between a 41N bookcase and the groud, when the bookcase accelerates at .25m/s2?
Homework Equations
F=ma Forcefriction=μ*force normal
The Attempt at a Solution
a=.25 m=41 μ=? I have absolutly no idea what i am doing
Is Lorentz factor reality true according to the laws of physics??
Hi
According to the laws of physics, the speed of light is independent of the speed of its source. In the example whereby there are two observers; one in the train moving at high velocity u relative to the other observer on...
Homework Statement
If F = 8.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.
Homework Equations
F=ma
The Attempt at a Solution
8-T=2a (2kg block)
T - 1cos10? = 1a (for the 1kg block. I got stuck here, the angle threw...
Homework Statement
The Attempt at a Solution
I found the acceleration using kinematics equations.
I don't know how to find the coefficient of friction though.
I need help answering pard b c and d
If you could give me the equations and explain.
Just knowing how to do this one...
A 1000kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional force fk between boat and water is proportional to the speed V of the boat: fk = 70V where V is in meters per second and fk is in Newtons. Find the time required for the boat to slow to 45 km/h...
Homework Statement
John (mass 80) rests on top of a light cube (mass = 0). A light rope passes horizontally from him over the front edge, and vertically down to Brian (mass 60kg) who hangs in contact with the front face as shown. The cube is on a horizontal surface and there is no friction...
Homework Statement
At what rate is electrical energy converted to internal energy in the 4.56Ω and the 5.91Ω resistors in the figure?
Homework Equations
Kirchoff's Laws:
ƩI(in) = ƩI(out) Junction Rule
ƩΔV = 0 Loop Rule
The Attempt at a Solution
I have set the top branch current...
1. Homework Statement
If a 25kg mass has a constant velocity of 5m/s, when pushed horizontally by a 5 N force, what amount of resistance force is present?
2. Homework Equations
F=ma
3. The Attempt at a Solution
I'm pretty sure the velocity is irrelevant, ... I made a...
Homework Statement
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 130.0 N at an angle of 15.0° above the horizontal. The box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and...
two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0, container 1 has mass 1.30 kg and container 2 has mass 2.8 kg, but container 1 is losing mass (through a leak) at the constant rate of 0.200 kg/s.
a) At what...
A 40 kg girl and an 8.4 kg sled are on the frictionless ice of a frozen lake, 15 m apart but connected by a roped of negligible mass. The girl exerts a horizontal 5.2N force on the rope. What are the acceleration magnitudes of
(a) the sled
(b) the girl
(c) how far from the girl's initial...
An elevator cab and its load have a combined mass of 1600 kg. Find the tension in the supporting cable when the cab, originally moving downward at 12 m/s, is brought to rest with constant acceleration in a distance of 42m.
Taking downwards as positive
My solution:
F net = mg - T = ma
T =...
A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.600. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg block, if the force...
Let’ say; “A” can see and measure a stone falls to the Earth let’s say 10 meter per 1 Earth-second.
“B” lives at Mercury and can see the same thing.
But “B” would do not see the exactly the same, because seen from “B’s” viewpoint time / distance is not the same as for “A”.
Let us say...
Homework Statement
Two weights are hanging by the following cables, A, B, C.
1. Find the tension in Cable A.
2. Find the tension in Cables B and C.
-----ceiling----------
\ 60) (60 /
\ /
\ /
B \ / C
\ /
\ /
[_]...
Net force and Newton's laws of motion!
Homework Statement
A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 490 N at an angle of 19° with the centerline...
Hello guys. I have a test in a couple of days, so I am hoping to get some practice. I'll post any questions I have here, I would appreciate if you guys can help me clear up any confusions. 1. A 400-N block is dragged along a horizontal surface by an applied force F as shown. The coefficient of...
Homework Statement A rocket that weighed 98.1 N when put together on Earth is attached to a 1.00 x 10^3-kg signal relay in intergalactic space. The rocket develops a constant thrust (i.e., it pushes with a force) of 10.0 kN. Compute the resulting acceleration. Homework Equations
a=F/m...
Homework Statement
they keep telling me it is a simple problem, I've actually done harder problems of the same thing, but i just don't seem to get this one.
A 15kg block sits on a 25kg block. The coefficient of static friction between the blocks is 0.408 and there is no friction between...
Homework Statement
The circuit in the figure is composed of two batteries (ε1 = 8 V and ε2 = 5 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 50 Ω, and R4 = 50 Ω) as shown.
Image: See Attachment
OR: https://smart.physics.illinois.edu/images/phys102/Homework/03/cir06.gif
Homework...
How are the various physical laws enforced in the universe? Even if there was only physical law out of which other laws manifest, how is that one physical law enforced?
thanks in advance for any and all help!
The question is to show that Kepler's 3rd Law holds when you assume circular orbit with TWO gravitating bodies both orbiting around the center of mass. (by equating gravitational and centripetal forces and finding the constant of proportionality which...
I am 14 and know Newton's laws, but are there more basic laws of physics either then Newton's? If you could tell me or give me a link that would be great!
Homework Statement
[PLAIN]http://img687.imageshack.us/img687/5055/imagelrl.jpg
Homework Equations
Static friction = (9.81sin60 x 0.2)N
Centripetal force = mr(w)²
The Attempt at a Solution
I am only abl to get part (i), need hints for part (ii) and (iii).
Thanks in advanced
The second law of thermodynamics states that the entropy in a system, such as our universe, always increases. The third law, however, says that entropy reaches zero as a system approaches absolute zero temperature.
Our universe has been cooling off since its origin (because of its...
I would like to compile a short list of inverse-exponent force magnitude fall-off laws for several simple geometries for material made of monopoles and for material made of parallel dipoles (of negligible length).
Far field force for any two objects is, of course, proportional to 1/r^2 for...
I came across this question, " An 8000 kg engine pulls a train of 5 wagons, each of 2000 kg along a horizontal track. If the engine exerts a force of 40000 N and the track offers a frictions of 5000 N, then calculate the force exerted by wagon 1 on wagon 2."
In this question,if we consider...
Hello!
I'm assuming the model of the Big Bang Theory and I'm asking specifically about the 'moment' of creation; I'm in no way well-versed in this; so please be gentle :
* Are the laws of physics applicable to the beginning on the universe?
* The Law of Conservation will not apply for this...
Why do I see Newtons 3 laws (mostly 2 and 3) given using differentials (F=dp/dt etc...) when it is far simpler to use the basic form F=ma (and the same for the 3rd law), is there an advantage to the more complicated form?
Homework Statement
2^-4 + 2^-6
_____________
2^-3
Homework Equations
The Attempt at a Solution
Ive tried several times, I do the reciprical of all numbers
ie) 1/2^4 + 1/2 ^6
___________________
2^3
Which gives me The wrong answer, cause i do the addiition first...
Homework Statement
fill in the blanks.
when a bird of weight W sits on a stretched wire, The tension in the wire is__________
Homework Equations
Force(external)=mass*aceeleration
The Attempt at a Solution
tension should approach to infinity...
Homework Statement
A pedagogical machine is illustrated in the sketch, yatta yatta, what force F must be applied to M_1 to keep M_3 from rising or falling? No friction. Here's the http://www.slideshare.net/brigittperalta/sol-maquina-pedagogica-1546585" .
The Attempt at a Solution
If we...