Representational state transfer (REST) is a software architectural style that was created to guide the design and development of the architecture for the World Wide Web. REST defines a set of constraints for how the architecture of an Internet-scale distributed hypermedia system, such as the Web, should behave. The REST architectural style emphasises the scalability of interactions between components, uniform interfaces, independent deployment of components, and the creation of a layered architecture to facilitate caching components to reduce user-perceived latency, enforce security, and encapsulate legacy systems. REST has been employed throughout the software industry and is a widely accepted set of guidelines for creating stateless, reliable web services.
Any web service that obeys the REST constraints is informally described as RESTful. Such a web service must provide its Web resources in a textual representation and allow them to be read and modified with a stateless protocol and a predefined set of operations. This approach allows the greatest interoperability between clients and servers in a long-lived Internet-scale environment which crosses organisational (trust) boundaries.
"Web resources" were first defined on the World Wide Web as documents or files identified by their URLs. Today, the definition is much more generic and abstract, and includes every thing, entity, or action that can be identified, named, addressed, handled, or performed in any way on the Web. In a RESTful Web service, requests made to a resource's URI elicit a response with a payload formatted in HTML, XML, JSON, or some other format. For example, the response can confirm that the resource state has been changed. The response can also include hypertext links to related resources. The most common protocol for these requests and responses is HTTP. It provides operations (HTTP methods) such as GET, POST, PUT, and DELETE. By using a stateless protocol and standard operations, RESTful systems aim for fast performance, reliability, and the ability to grow by reusing components that can be managed and updated without affecting the system as a whole, even while it is running.
The goal of REST is to increase performance, scalability, simplicity, modifiability, visibility, portability, and reliability. This is achieved through following REST principles such as a client–server architecture, statelessness, cacheability, use of a layered system, support for code on demand, and using a uniform interface. These principles must be followed for the system to be classified as REST.
The term representational state transfer was introduced and defined in 2000 by Roy Fielding in his doctoral dissertation. Fielding's dissertation explained the REST principles that were known as the "HTTP object model" beginning in 1994, and were used in designing the HTTP 1.1 and Uniform Resource Identifiers (URI) standards. The term is intended to evoke an image of how a well-designed Web application behaves: it is a network of Web resources (a virtual state-machine) where the user progresses through the application by selecting resource identifiers such as http://www.example.com/articles/21 and resource operations such as GET or POST (application state transitions), resulting in the next resource's representation (the next application state) being transferred to the end user for their use.
if de Broglie's equation: wavelength = h/(mv) works allways, then what is the wavelength of an object at rest (v=0) is it undefined or infinity or something?
As stated in SR and the principle of equivalence, there is no privileged reference frame or reference frame at absolute rest. However, I went across the following idea that seems to be able to tell if a reference frame is moving or at rest. Please help me point out what is wrong in my idea...
Hi guys,
simple question I have:
Do particles without a rest mass (including EM radiation) cause spacetime to bend? Or only those with a rest mass have gravity?
I'm currently a sophomore with a major in math/cs (single major, not a double major) and I have a plan of what I'm taking for the rest of my time here apart from my degree. I ran it by the general adviser guy and he said it was good, but we really didn't discuss the pros and cons of it, more...
Homework Statement
How Long Does it Take An Object To Fall 5 m From Rest? (g=10 m/s^2)
Homework Equations
None
The Attempt at a Solution
I have no idea.
Homework Statement
Calculate the rest mass of Deuterium nucleus.
Homework Equations
Is it correct to calculate its mass using hydrogen?
i.e. 2*rest mass of hydrogen?..
The Attempt at a Solution
As stated in textbook,
the rest mass of deuterium = 3.34330*10^-27 kg
If it is...
Homework Statement
The system is released (m2) from rest and mid AB
How can I show that he system comes to instaneous rest when m2 has fallen a distance
of (4am1m2)/(4m1^2-m2^2)?
Homework Equations
The Attempt at a Solution
Applicability of Algebraic Geometry (and all the rest of math that goes with it)
Hello fellow mathematicians and physicists. I’m at that crossword in my university life right now, fall semester of sophomore year, and I really could use some advise in my next load of classes. I have always...
I'm currently taking Differential Equations, a senior-level American Revolution course, and an Intermediate Macroeconomics course. I'm also working half-time. I'm not doing as well as I would like in DE - essentially a "B-" on the first exam. I just had an exam yesterday, and I think I did a...
Homework Statement
Two blocks (m1 = 0.02 kg, m2 = 0.03 kg, v1 = 1.5 m/s, v2 = 0.5 m/s) are sliding without friction on a surface. They are approaching each other at angle θ = 60º. In what direction and with how much velocity do we have to push the third block (m3 = 0.05 kg) against the first...
Homework Statement
A train is traveling up a 3.73 degrees incline at a speed of 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 momentarily coming to...
Homework Statement
A rocket moves upward, starting from rest with an acceleration of 32.2 m/s2 for 5.84 s. It runs out of fuel at the end of the 5.84 s but does not stop. How high does it rise above the ground?
Homework Equations
I do not know. All equations I have tried have been...
I'm only at the end of the second year (out of 5) of a physics bachelor. I plan on to do a Phd although I've absolutely no idea in which area (and I know the admission will be very hard). After the Phd I'd like to do research for the rest of my life. Is that possible in the US?
For example...
From my reading i am seeing the answer
But according to special relativity, light ALWAYS travels with the light speed c, and is NEVER at rest
and from this statement i am supposed to gather there is no rest mass. But logic tells me just because light is never at rest, doesn't necessarily...
A weight of mass 12.5 Kg hangs from very light pulleys as shown in fig. What force must be applied to the rope so that the mass stays at rest.
M=12.5 Kg
W=mg
a=g=9/8 m/s^2
M=12.5 Kg
W = mg = 12.5 x 9.8 = 122.5 N
I've done this much but I have no clue what to do now. Can someone please...
Homework Statement
The plastic tube has a cross-sectional area of 5.00 cm². The tube is filled with water until the short arm (of length d = 0.800 m) is full. Then the short arm is sealed and more water is gradually poured into the long arm. If the seal will pop off when the force on it...
Homework Statement
A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x(t) = bt^2 - ct^3, where b = 2.30 m/s^2 and c = 0.120 m/s^3.
How long after starting from rest is the car again at rest?
Homework Equations...
Homework Statement
perform a calculation for an object moving vertically in air under gravity and experiencing a retarding force proportional to the square of the objects speed. see (W=.5(cwpAv2)
Object is dropped off a 100 meter building from rest.
radius of object = .0366m
mass = .145...
Why does a non head on collision between objects with momentum and an object without momentum result in a 90 degree split? (objects have similar mass)
Could you please represent this in vector form? I'm not sure how I could represent this because it's not a head on collision but a side swipe...
I'm reading Concepts of Modern Physics by Beiser, and the chapter example says:
A spacecraft is moving relative to earth. An observer finds that in one hour, according to her clock 3601s elapse on the spacecraft 's clock. What is the craft's velocity relative to earth? (This is not a...
How do you define "at rest" in the Universe?
I was reading in a Scientific American an article called: "Misconceptions about the Big Bang" By Charles H. Lineweaver and Tamara M. Davis.
In it I found this:
Individual galaxies move around at random within clusters, but the clusters of...
Hi!
I'm pretty much a pop science guy so I can't say I know much about the underlying math or physics, but after listening to these lectures about pretty much everything over and over again, there is one thing I just can't seem to find the answer to.
The explanation of red/blue shift is...
Consider a 4-coordinate system x=(x^0,x^1,x^2,x^3), x^0 plays a role of time, x^1, x^2, x^3 are some kind of space coordinates. In what follows greek letters will be 1,2 or 3, latin will be 0,1,2,3, c = 1, proper time squared ds^2 = g_{ik}(x) dx^{i} dx^{k}.
Now, if the body is "at rest" we...
lambda = h/mv
v -> 0 means lambda is -> infinite?
So if I have an old pickup truck that moves really slow, its matter wave is huge, right?? So it's now a wave and not a particle?
So I wonder why the gradient in coordniates other than cartesian ones bears coefficients. Let's take spherical coordinates for example. We have
(Source) - Sorry if image doesn't work - too lazy to get the TeX right.
From what I know, I don't see anything that raises cartesian coordinates...
According to my physics textbook, the equation E^2=\left(mc^2\right)^2+\left(pc\right)^2 suggests that a particle may have energy and momentum even when it has no rest mass, and that the total energy then is E=pc. This strikes me as odd, since the relativistic momentum of a particle is given by...
SOLVED Given initial angular velocity of wheel, find revolutions to rest
Homework Statement
As a result of friction, the angular speed of a
wheel changes with time according to
d \vartheta / dt = 4.1e-.088335775t
where the initial angular velocity is 4.1 rad/s.
Find the number of...
Homework Statement
Thanks for everyone that helped me with the physics questions! I had my physics 2 final today and got a 94! There was a question that I could not figure out for a long time. It goes like this.
What would the velocity of the photon be if the Kinetic energy of the photon...
I have read over the definition of the derivation of the energy relationship with momentum and rest mass and I am a little confused.
By looking at the definition of relativistic mass we have the definition
m = m0 / SQR(1 - v^2/c^2) where m0 is the rest mass.
Now a photon always travels...
Homework Statement
In the figure below, an open tube of length L = 1.8 m and cross-sectional area A = 4.6 cm2 is fixed to the top of a cylindrical barrel of diameter D = 1.2 m and height H = 1.8 m. The barrel and tube are filled with water (to the top of the tube). Calculate the ratio of the...
Hi
How would I show that the centre of mass of two point particles, one of mass m1 and the other m2, when released from rest from infinite simultaneously, stays in the same place?
I feel this is a very simple question, I just can't seem to get it right. Everything I've tried still involves...
Does the CMB allow special "almost" rest frames to be defined? In this sense, use a rocket to put yourself in a frame of reference such that in this frame observations of the CMB would average to zero (average over photon momentum) over your celestial sphere.
In such a rest frame is the total...
http://www.thrfeed.com/2009/03/discovery-universe-hawking.html
I'm really excited about this. Planet Earth was such an amazing series that did what a lot of hopefuls failed to do: tap into the sit-com audience. For a lot of us, 'Universe' will just be a cool rehash of things we already know...
From what this layman can comprehend of Einstein's relativity is that mass causes a curvature of space-time. This space-time is a 4-dimensional geometrical construct. An object moving through a gravitational field would deviate from its straight space-like path in order to achieve the closest...
Hi. I am someone who would like to begin to understand the mathematics behind physics. I have forgotten much of the math that I was taught in high-school, not that I paid much attention at the time, unfortunately. I ran across the book The Mathematics of Relativity for the Rest of Us which looks...
Homework Statement
Two stationary positive point charges, charge 1 of magnitude 3.45 nC and charge 2 of magnitude 1.85 nC, are separated by a distance of 50.0 cm. An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two...
Homework Statement
What is the rest mass energy of one mole of neutrons? Hint one mole is 6.02 x 1023 particles (avocado's number), and the neutron has mass m=1.675 x 10 -27 kg.
Homework Equations
The Attempt at a Solution
I wasn't sure of the relationship between moles and...
Homework Statement
Two blocks, A and B (with mass 20.0 kg and 40.0 kg , respectively), are connected by a string, as shown in Figure P5.64. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is μk = 0.290. Determine the change...
Is there such a thing as "at rest"?
I've been watching some lectures on relativity from a professor at Berkley and he brings up the central idea of the "reference frame" relative to being in motion or "at rest".
He says that if I were to ask you if you were currently in motion or at rest...
why do bodies at rest weight more than zero?
here is the bull thing...
now I am sitting on my chair and i know Earth exerts a force on me which is called my weight. by definition w=mg
I DO NOT have any acceleration g or anything else. let me prove
a = dv/dt my speed is zero v = 0, coz...
Two MM-devices A and B (=two perpendicular arms x and y being the paths for light signals) are at rest in the same frame. Both arms are of equal length, say, 1 light-second long. B is accelerated away along the positive x-axis and reaches relative velocity, say, 0.5 c. I asked: will B have to...
Homework Statement
here's the problem
A 68.5 kg skater moving initially at 2.40 m/s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice.
Homework Equations
F= ma
The Attempt at a Solution
I'm sure this equation is reliant on finding the...
Hello all,
First off, I am not sure if these questions belong in this category.
For a couple of years now I have been interested in physics/quantum mechanics, and a while ago I decided it was probably my main interest. After realizing my school did not offer physics, and therefore not...
In QM, the energy of a particle with a non-zero rest mass is Planck's constant times the frequency. How does the energy associated with the rest mass m0c2 fit into this picture? Planck wrote of an "instrinsic frequency" associated with the rest mass. Thanks in advance.
Homework Statement
[This probably seems really easy to the physics whizzes out there but...*blushes*]
Two identical cylindrical vessels with their bases at the same level each contain a liquid of density 1.30x103 kg/m3. The area of each base is 4.00cm2, but in one vessel the liquid height is...
Homework Statement
Mass of 22kg on a 45o to the horizontal.
\mus = 0.78
\muk = 0.65
Determine the magnitude of the largest force that can be applied upward parallel to the ramp to have the box remain at rest.
AND
Determine the magnitude of the smallest force applied to the top of the box...
Homework Statement
A steam engine is running at 200 RPM whe nits steam is shut off. The friction of its various parts produces torques that combine to decelerate the machine at 5.0 rad/s^2. How long will it take to come to rest?
Please help asap I have a test tomorrow.
Homework...
This is probably a very elementary question so I apologize in advance.
Relativity says that objects of great mass warp the fabric space, hence why we experience gravity.
Do objects of great mass simply warp and float ABOVE the fabric of space, or do they rest ON the fabric like marbles on...
Homework Statement
An object at rest explodes into three pieces of masses 5.00 kg, 10.0 kg and 20.0 kg. The 5.00 kg piece moves west at 30.0 m/s; the 10.0 kg piece moves southwest at 20.0 m/s. What is the velocity of the 20.0 kg piece and what direction is it moving?
Homework Equations...
can anyone help me to solve this question? please and thank you :D
A small block slides from rest from the top of a fixed frictionless sphere of
radius R.
Determine the vertical distance traveled by the block, x , where it loses
contact with the...