Ground Definition and 921 Threads

Thanks in advance for anybody who is kind enough to help me. No this isn't for my homework. I am not even enrolled in school. I am doing some calculations for personal research. But I need to know the ground state radius of a muonic hydrogen atom to help prove my theory. I already know the...

Homework Statement If an acrobat isn't touching the ground how can he changes his rotation speed? Homework Equations The Attempt at a Solution

Tha classical ground state is Ne\'{e}l state: every spin up is surrounded by nearest neighbours which are down, and vice versa. To give them a name, denote the spins down the A sublattice, and the spins up the B sublattice. Perform a canonical transformation on the B (but not on the A spins...

Would the energy just be a multiple of how much bigger it is than electron?

Must the ground state in an even potential of one dimension be the even parity?

My physics teacher said that if the sea ground is higher, then, because of the stronger gravitational force, the sea level is lower. I am not sure if this is true and he didn't give a very strong proof. I thought sea level equalizes all over the earth. Of course I am taking the sea level in...

The ground state electron configuration of Carbon atom is 1s^{2}2s^{2}2p^{2} For the electrons, 1s^{2}2s^{2}, L=0, S=0 So only consider electrons of 2p^{2}, and s_{1}=s_{2}=1/2 ---> S=0,1 l_{1}=l_{2}=1 ---> L=0,1,2 For S=0, L=0; J=0, so we have ^{1}S_{0} For S=0, L=1; J=1, so...

Hi, I am working on simulating the change in temperature over time for the ground, given different material types. For instance, I'm considering an asphalt patch of ground say 10 square meters in area. For now, I'm willing to ignore atmospheric effects like rain, wind, and varying sun...

Homework Statement Empty cubic box of dimension "a" with conducting walls. Two opposite walls are held at a constant potential V, while the other walls are grounded. Find an expression for the electric potential inside the box. (Assume box centered on the origin, walls are all normal to one...

When given a Hamiltonian operator (in this case a 3x3 matrix), how do you go about find the ground state, when this operator is all that is given? By the SE when have H\Psi=E\Psi. I can easily solve for Eigenvalues/vectors, but which correspond to the ground state, or am I missing something?

Homework Statement Use leading order perturbation theory to calculate the ground state shift of hydrogen due to perturbation: \hat{V} Homework Equations 1. Leading terms in expansion of energy: E=mc^{2}+\frac{p^{2}}{2m}-\frac{p^{4}}{8m^{3}c^{2}}+... 2. \hat{H}=\hat{H}_{0}+\hat{V} where...

Just wondering. Would appreciate any input! :)

Homework Statement A particle is initially in the ground state of a one-dimensional infinite square well extending from x=0 to x = L/2. Its wave function, correctly normalized, is given by \psi (x) = \dfrac{2}{\sqrt{L}} \sin{(\dfrac{2 \pi x}{L})}} for 0 \leq x \leq L/2 Suddenly, the right hand...

Homework Statement Find the ground state wave function for the 1-D particle in a box if V = 0 between x = -a/2 and x = a/2 and V = \infty Homework Equations I would guess -- Schrodinger's time-independent equation...

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...

I have no idea on where to start with this. Also we are not allowed to use The normal physics equations, we have to use maths. At time t = 0 a projectile is fired from a height of h above level ground at an elevation angle of a and a speed of v. Show that the time when the projectile hits...

Not exactly a homework question, but I need to know this before I can answer the question Homework Statement There's a pulley suspended from a rope A. Hanging from the pulley from one side is a mass m. "Hanging" off the other side of a pulley is simply the same rope (which is attached to...

I know that electrons want to flow to ground (earth ground) so I have a few questions: Is it only AC current that flows to ground(I ask this because I saw a video of a person with a Tesla coil on their car and the electricity was going to the ground)? If I put the -(negative) side of a 9V...

I'm not sure how to calculate the probability in a non-hydrogenlike atom. Perhaps I'm missing something. Z=1 to Z=2. Of course, n, the principal quantum number is n and l would be zero. http://i111.photobucket.com/albums/n149/camarolt4z28/2010-09-23195548.jpg?t=1285517610

[b]1. The problem statement, all variables and given/known da A ball is shot from the ground into the air. At a height of 9.7 m, the velocity is observed to be v = (7.4)i + (5.1)j in meters per second (i horizontal, j upward). Homework Equations What will be the total horizontal distance...

I am trying to figure out how exactly Angular friction ("torque") is connected with friction force. Is there any connection between torque friction and force friction?

What's ground lead screws ? What's the differences between the ground lead screws and lead screws ?

I was reading Hasan & Kane's review on topological insulators and right in the beginning, page 3, they say that the Bloch ground state is U(N) invariant. I do not see that. Would anyone be able to show it or point to a reference? Thanks, Jan.

A ball is thrown from the top of a building upward at an angle of 47 ◦ to the horizontal and with an initial speed of 23 m/s, as in the figure. The ball is thrown at a height of 46 m above the ground and hits the ground 82.0127 m from the base of the building. The acceleration of gravity...

Homework Statement A cargo plane is flying horizontally at an altitude of 11.5 km with a speed of 860 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.) (a) How long does it take the crate to hit the ground? Homework Equations...

I've seen many 'isolated ground' outlet, in schools and hospital. Tried to google it but didn't find much information about those. They're and orange case, and usually are just beside the normal mains. What is special about those? Are they safer? Thanks, Sakha.

Why is it that it's the gravitational force that keeps me on the ground? Rather than the electrical force? In general, and by the equation, electrical force is much stronger than the gravitational force!

DC Blocking capacitor -- How does it know where ground is? Hi Everyone, A DC blocking capacitor removes any DC offset from an input signal. I've been doing this for years without thinking about it. My question is, how does it know what the local ground potential is? My only thought on...

I am from HK. Hope you guys can understand my poor English! ^^ actually, this is not for my homework but my preparation for the public exam. Homework Statement The situation is that a ball bouncing up and down on the ground in vertical direction. The question is to choose which graphs best...

It says in numerous books that radiation dissipates after about a distance of from the Earth to the sun, and also when the scientists sent the radio signal of the Beatles's music into outer space a while ago, that , even though they did that through SETI, or whatever program they did that...

As I understand, it is postulated that only coherent states in LQG correspond to classical spacetimes. Is the ground state of LQG a coherent state? Otherwise, what principle selects that the universe should be in a coherent state?

There will be no mosque built at Ground Zero in New York City. Two blocks away from where the World Trade Center stood is The Cordoba Center, a multicultural activity center. What is being proposed there is a “prayer room” for Moslems wishing to pray. A prayer room is similar to a Christian...

Hello everyone, I want to know the presently existing works on the topic of ground state properties of Hubbard model (spin-1/2-, or extended- ). I am nonexpert and have not googled for useful information. Please tell me some articles or monographs on this if you know. Thanks!

Okay, the title sounds weird, let me explain: The father of a friend of mine used to work in the mines about 800m under the ground and he always experienced that when he had to carry heavy gears, it felt as if the item was considerably lighter to carry underground than when he was aboveground...

Hi, why is the ground state energy usually set to E_0 = 0 for a Bose gas? Normally one looks at a particle in a box, where the ground state energy should be different from 0. Here is the "particle in a box ground state energy" calculated in a Bose-Einstein contex...

What does the Ground State of a quantum simple harmonic oscillator represent physically? Thanks in advance.

Homework Statement A ships captain wants to sail east. His ship experiences a current of 5.0 km/h [N]. The ships engine can produce a speed of 20 km/h. What must the ships heading be and what is the ground velocity of the ship. I really don't know what to do I was hoping someone can tell me...

I am researching ground source heat pumps, however I do not completely understand how they work. I understand that a pump uses a small amount of electricity to pump heated ground water or an antifreeze solution through the a system of piping in the ground to transfer heat from the ground to a...

Calculus based course, this is from the "linear momentum of a system of particles" section. I've attached a rough sketch of the graph from my textbook. The main points of the graph are this, it's a parabola, at T=0 and T = 4.5, P(momentum) = 6. At T= 2.25 (maybe) it bottoms out. I say maybe...

hello friends can i say that Ground(earth) and neutral are same ? if not so, please distinguish them for me :smile: thanks

Has war gotten too easy for the nation? We can maintain two wars at a time without any really serious impact on the average American. We are in a time and age when the US (and other world powers) maintains a large enough volunteer army that we can declare and maintain a war without the...

Homework Statement A ball is thrown at a velocity of 10 m/s, at an angle of 30° from horizontal and released 2 m above the ground. What will the magnitude of ball’s resultant velocity be at the moment of impact with the ground? Homework Equations Vf2 = vi2 + 2as The Attempt at a...

Ok so I've been wondering, how is it that physicist's EXPERIMENTALLY determine the ground state configuration of electrons in a particular atom? In other words do they use emission spectra/thermodynamic calculations/etc? Also, if ground state represents an atom's minimal energy state, which...

When the grounds are different at source and destination, how do you connect the signal source to your circuit? I know there is a difference in the ground potential of source and destination. But is this treated as noise or just an additional voltage that adds with the source signal? I thought...

Homework Statement A particle is prepared in the state \psi (x) = \frac{1}{\sqrt{L}} in a region 0 < x < L between two hard walls (particle in a box). Calculate the probability that the particle is found in the ground state when its energy is measured. Homework Equations This question...

In the double slit experiment the electron can go through either slit. As long as it is not observed there is an interference pattern as the two possibilities superimpose. The common conclusion to this is that the electron goes through both slits. Is there a parallel with the ground state...

I am confused about this example circuit (attached) where the Gate it connected to Ground. I thought in order for current to flow in a MOSFET (i.e. NMOS) a positive gate voltage (Vg) AND Vds (drain to source voltage) needs to be applied. If Vg = 0, how is a channel created in order to allow...

Homework Statement I am doing an experiment to find the difference in photosynthesis between different areas of grass. I have and am taking more measurements. But essentially I need to convert the data I have into a flux per area over time. the data logger records the data of CO2...

In electronics it is customary to define the potential of ground (thinking of the Earth as a large conductor) as zero. Is this consistent with the fact that the Earth has a net electric charge that is not zero?

I am confused about the definition of ground state and its characteristics. For a field in spacetime do we mean the ground state to be the minimum of the potential or minimum of the total energy? Specifically what is the momentum four vector of the ground state ( p^{\mu}=(...) ) for a massive...