Picture Definition and 402 Threads

Homework Statement The relation xRy is defined as "x has drawn a picture of y". R is on the set of all people. Is this relation: reflexive, irreflexive, symmetric, asymmetric, antisymmetric, transitive ? Homework Equations What confuses me about this problem is that there is uncertainty...

[PLAIN]https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc7/313028_10150383340891940_666206939_8328916_99129355_n.jpg Would this system work, if the air-water isolation problem (water leakage into the air tank) is solved? If it would work, where does the input energy comes from? We obtain...

A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 17 m/s at angle of 52◦ above the horizontal. The top of the fence is 7 m high. The ball hits nothing while in flight and...

Homework Statement I've seen this example for using the Heisenberg equation of motion to solve the Simple Hamonic Oscillator. http://en.wikipedia.org/wiki/Heisenberg_picture#Commutator_relations" However, if you were only interested in one variable, let's say position, on how the the...

Need a physical picture! The electric potential of some charge configuration is given by V(r) = A*e^(-λr) / r Its Electric field is E = A*[(λr+1)/(r^2)]*e^(-λr) \hat{r} And its charge density is ρ = 4*pi*A*ε0*δ(r) - [(ε0*(λ^2)*A*e^-λr) / r] , where δ(r) is delta function. The thing that...

Homework Statement http://imgur.com/EcjIaHomework Equations I already got the first part (v_b/a) i need to find r dot and theta dotThe Attempt at a Solution well i got v_b/a. for r I was thinking of using sqrt(y^2 +x^2) at the r and taking derivatives of that. i don't quite understand polar...

1) If we charge a stacked capacitor like the one in the picture and then remove the leads (red and blue) what will be the voltage between bottom and top plate? Is it going to be 5 times (the number of stages) the original voltage or what? [PLAIN]http://img89.imageshack.us/img89/4742/capr.png...

I'm slightly confused as to how we can use the picture of a 2D surface embedded in 3D space as an analogue to understand (maybe not picture!) 4D spacetime. My initial thinking was that trying to imagine a 4D spacetime isn't really possible, it's just a mathematical concept which one should not...

I attached the problem, how can you tell? nvm , i think it's a chamfer because the corners aren't rounded

Am I right in thinking that the Heisenberg matrix interpretation describes emission, while the Schroedinger interpretation does not?

So this concept of H = H_o + H_int has been extremely confusing to me. Wikipedia offers the best explanation, but there a couple things that still confuses me http://en.wikipedia.org/wiki/Interaction_picture Why is the state vector in the Interacting picture defined as |\psi_{I}(t)> = e^{i...

Hi all! Can anyone tell me What this picture of a quantum dot means?? The signifigance of what this exact picture stands for. What does it prove??

Homework Statement we have to create a picture in the graphing calculater, rules to the project 1window must be set at X[-20.7,24.7] and Y[-13,17] 2picture must be centered in this window 3no fewer then 20 program lines. horizontal and vertical lines don't count in the 20 4no programs within...

So I was looking some stuff up on Quasars on Wikipedia and noticed this picture. http://upload.wikimedia.org/wikipedia/commons/a/ab/2003-03-b-web.jpg It says that this is a Quasar Core. What exactly is the difference between the left and right pictures here? Did they block out the light...

Do you agree that the development of Quantum field theory has totally outdated the concepts of particles? How come we still talk about particle wave duality? If you use this concept to explain the double slit experiment. Endless debates arise as to whether the electron pass thru the left or...

I had a math question about the following steps. The Shroedinger's equation can be written as follows. \LARGE i\hbar \frac{d}{dt}U(t) |\psi(0)> = HU(t)|\psi(0)> Where H is the hamiltonian and U is the time evolution operator. So U satisfies the schrodinger equation. \LARGE...

Homework Statement A crate is carried in a truck traveling horizontally at 15m/s. If the coeff of static friction between the crate and the truck is 0.40, determine the min. stopping distance for the truck such that the crate will not slide on the truck. Homework Equations Newton's Laws...

I figured this is the best place for asking this question. My apologies for those that find it inappropriate. I am looking for an image of the engineer's magic box for a powerpoint :(. If it has a proper name, please tell me. See the attachment for my MS Paint representation.

Determine the maximum horizontal distance that a projectile will have at a height of 60 m above its origin if it is fired at an angle at 70degrees from the horizontal with a velocity of 50m/s

In peskin chap 4 on interaction field theory, he first introduced some basics about interaction picture(mostly in pg. 83~87) , it seems he assumed the Hamiltonians H=H_0+H_int in Schrodinger picture are all time-independent, because he used quite a lot of notations like exp(iHt), exp(iH_0t) and...

Simple electric force problem with point masses... includes picture! Homework Statement Four point charges of +/- q are arranged on the corners of a square of side L as illustrated in the figure. What is the net electric force that these charges exert on a point charge q placed at the center...

I'm sure someone else must have come up with this (the description in the third paragraph), but I haven't seen it. Briefly, for those not familiar with it, radar simultaneity generalizes Einstein's simultaneity convention directly to arbitrarility accelerating observer. Dalsepam has posted a...

Hello, looking for a picture of black body radiation from an oven Years ago I had found a nice illustration. An opened hot oven was shown. The pottery inside could hardly be seen. This illustrated what I believe is one of most important aspect of a black body. If is specially useful...

I'm a high school physics teacher and my students are building a science payload to launch on a weather balloon. You can look http://www.donorschoose.org/donors/proposal.html?id=458390&challengeid=39361" to see some project details and even donate a couple bucks to help make the project a...

Homework Statement An ice cube slides on a frictionless sphere. It is placed at the top at of the sphere with radius (R), and given an instantaneous push at speed (S). At what angle(x) from vertical does the ice cube leave the surface of the sphere? Radius = R Speed/Velocity = v angle = x...

Homework Statement A 3.2 kg particle moves along the direction under the influence of a force described by the potential energy function U = a k~xk, where a = 5.48 J/m and x is the position of the particle in meters measured from the origin as in Figure. The total energy of the particle...

Homework Statement A(n) 2300 g block is pushed by an external force against a spring (with a 14 N/cm spring constant) until the spring is compressed by 19 cm from its uncompressed length. The compressed spring and block rests at the bot- tom of an incline of 33◦ . The acceleration of...

Homework Statement A poorly designed playground slide begins with a straight section and ends with a circular arc as shown in the figure below. [PLAIN]http://img716.imageshack.us/img716/8381/25746193.jpg A child starts at point P and slides down both sections of the slide. At some point on...

On the Wikipedia page for http://en.wikipedia.org/wiki/Heisenberg_picture#Mathematical_details" we find this relation \frac{d}{dt}A(t)=\frac{i}{\hbar}[H,A(t)]+\left(\frac{\partial A}{\partial t}\right) I don't understand what the distinction between \frac{d}{dt}A(t) and...

Hey guys, Im trying to write something up, and I want a more detailed explanation of this calculation (image below) - Can anyone give it a go? Thanks in advance I am trying to find a graphic/image that best suits calculations that have to do with acceleration and gravity, so if...

Homework Statement A crate is pulled by a force (parallel to the incline) up a rough incline. The crate has an initial speed shown in the figure below. The crate is pulled a distance of 5.94 m on the incline by a 150 N force. The acceleration of gravity is 9.8 m/s2 ...

Homework Statement Hint: W = ~S · ~F . Consider a force ~F with components Fx =28 N, Fy = 57 N, and Fz = 99 N, as illustrated in the figure below. Work is done when a particle moves up the vertical z-axis a distance of 4 m. [PLAIN]http://img691.imageshack.us/img691/5594/problem4e.jpg What...

Hello, I hope you can help me. I thought I have an idea about GRT but I found this about about the basic cosmology. It is a link to a video from Stanford Univerisity. In short words: Susskind seems to confuse coordinates with distance. I can't understand that he seems to talk about defined...

Can someone please explain the picture attached below ? It has been taken from a lab where the supervisor actually failed to tell what is the remote sensing bulb doing attached to a condenser. I would like to know that why is it there and is the wire that is sticking out a capillary tube? If not...

Hartle Hawking suggest probabilities for observations (eternal inflation picture) http://arxiv.org/abs/1009.2525 Eternal inflation without metaphysics James Hartle, S.W. Hawking, Thomas Hertog 4 pages (Submitted on 13 Sep 2010) "In the usual account of eternal inflation the universe is...

I've been trying to organize my thoughts about conservation laws in GR, and so far I'm not having as much success as I'd like in bringing order to the whole topic. Maybe this is just the way GR is -- conservation laws don't play their usual central role, and their behavior varies on a...

hello guys i need to know about an algorithm that can understand unique differences in a contenuse change photo [picture not a film ] where should i start looking ... what word shoould i use in the google / duckduckgo ,..etc

can anyone pls answer the question on the pic... thx...

I was trying to follow http://www.youtube.com/watch?v=dCua1R9VIiQ&p=EFD655A9E0B979B7&playnext=1&index=54" lecture at the 4:15 mark but am having a little difficulty. In particular, why doesn't he have to take the commutator of all four of the terms you get when you square (p-eA). Is he using...

I would like do estimate the total number of different pictures I can represent by choosing a specific resolution and color depth, the number I'm getting seems somewhat low, so I'm wondering what am I doing wrong ? Let the picture size be 45x45pixels with a color depth of 8 bits (2^8 = 256...

http://www.newscientist.com/gallery/dn15018-pick-of-the-pictures?DCMP=OTC-rss&nsref=online-news

Please tell me where my understanding of the Heisenberg and/or the Schrodinger picture falls apart. -Schrodinger says the state vector of a system changes with time according to a unitary operator that doesn't change with time. -Hesienberg says the state vector of a system doesn't change...

All of a sudden the picture on my Panasonic CRT television disappeared, but the sound remained. The most common cause of the picture disappearing is a faulty tube and the warning sign of this can be seen for some while. So it can't be the tube. There was a funny burning type smell from the...

Hello every body : i am very new to programming ,i am trying to write a programme that will work on the LSB of each byte in a 24 bit picture. now my question is how to treat a .bmp file ,i mean can i consider it as an array of integers with leth (for example)800x600. and start to changing the...

Hi, I'm trying to learn stuff for my relativity module, and it goes on about spacetime and the 4-dimensional continuum and four-vectors and all that business. I am having trouble imagining whatever it is I am supposed to picture when people talk about this. Take this thing, i believe its...

I go to Iowa State University, which is a decent college for engineering, not great. My GPA is not good right now (3.3, about to be 3.6ish after finals next week). I will try to ace every single college class for my next 2.5-3 years in college. I will tackle heavy courseloads, and still work in...

[FONT="Arial"][SIZE="4"]can anyone tell me please what is the light spot in these picture ?

Hi Is it me, or is the polarity on the voltmeter wrong for this mutual induction example. http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/indmut.html In particular the 2nd and 3rd images of the first page Coupled Inductors. I agree with the change in B field and induced current...

Hi, I'm just trying to convince myself that the field in the interaction picture (IP) \phi_I(x,t)=e^{iH_0t}\phi(x,0)e^{-iH_0t} satisfies the Klein Gordan equation: (\tfrac{\partial^2}{\partial t^2}-\nabla^2+m^2)\phi_I(x,t)=0 . I have so far worked out that the time derivative is...

The purpose of this thread is to collect information from various users on projects that will be applied by the end of the decade. Information/Computation Internet via Satellite may be more cheaply available and more reliable making internet access anywhere possible. Contact lenses with...