Ground Definition and 921 Threads

How to show the ground state is orthagnol with the first in a quantum harmonic os... Homework Statement This is a revision question for an upcoming quantum mechanics exam, that i am stuck on. Any help or idea at how to approach the question would be greatly appreciated, i get the feeling...

Homework Statement : the binding energy for the electron in the ground state of hydrogen-2 is 13.6ev what is the corresponding mass defect of the hydrogen atom in amu (atomic mass units) not sure if you need atmoic mass of the hysgrogen atom its given to be 2.014102u Relevant equations: not...

please help me ,i have a project which i m not easy with can anyone help me in designing a a vapor compression cycle for cooling in the summer and if desired heating in the winter, and a ground source heat pump for cooling in the summer and if desired heating in the winter.

How can I tell, with an electronic configuration, if an element is in ground or exited state? Also, how can I determine what element it is if it uses a noble gas shortcut? I assume I find the noble gas in brackets, count the atomic number, add it to the elec config outside of the brackets, and...

im looking for the 3 principals i need to be employ in determining the electronic structure of the ground state of an atom Ive got Paulis exclusion principle where no 2 electrons in an atom can occupy the same quantum state and hunds rule of the total spin of the electrons always has it...

How many electrons in the ground state of a Hg atom can have the quantum number ml = +1? The way I am trying to figure this out is as follows.. Electron configuration for HG is.. [Xe]6s^2 5d^10 n=6 l : ml 0: 0 1: -1,0,1 2: -2,-1,0,1,2 3 -3,-2,-1,0,1,2,3 4 -4,-3,-2,-1,0,1,2,3,4...

Homework Statement A soccer ball is kicked at an angle of 64° to the horizontal with an initial speed of 18 m/s. Assume for the moment that we can neglect air resistance. Homework Equations For how much time is the ball in the air?... Seconds (b) How far does it go (horizontal distance...

Why must the ground state not have a node？ And the first excited state must have 1 node.

It was released from a height of 1 meter above the surface. Describe the motion of the Earth from the moment I released the object in a realistic way. Order of magnitude estimates are ok. but you have to justify those approximations in a reasonable way. Hint: This problem may look rather...

Homework Statement Why is the ground state always symmetric and first excited state anti-symmetric? OR Why does the ground state always have no node and first excited state has one node? Homework Equations The Attempt at a Solution

I want to construct the ground state wave function of orthohelium. Here is my reasoning, please let me know if I am correct or not. I forgot to add that for this post I am ignoring the electron-electron interactions. Orthohelium has the triplet spin state which is symmetric. Because the total...

Homework Statement 2 electrons are in a box of length L. Ignoring Coulomb force, 1 and 2 are labels for the electrons and m is the mass of an electron. What is the ground state and 1st excited state for the energy and wavefunction for the two electrons? Is there more than one wavefunction...

The velocity of a skydiver falling to the ground ... Homework Statement SORRY FOR SO MANY QUESTIONS! I'VE BEEN WORKING THROUGH EACH OF THESE UNTIL I'M COMPLETELY STUCK, SO DON'T THINK I'M JUST TRYING TO SUCK ANSWERS OUT OF YOU FOLKS! The velocity v(t) of a skydiver falling to the ground...

is the principle how an aircraft move ahead in ground similar to how a spacecraft moves ahead in empty space? in the ground air is propelled backward and in space since it has no air, small explosion pushes the spacecraft ahead. Newtons third law. i understand in the case of...

My girlfriend recently took a physics exam, and she was confused about why she got one of the problems wrong. She asked me hoping I could clear it up. Heres my attempt Homework Statement Three Identical balls are thrown from the top of a building, all with the same initial speed. Ball A is...

If I buy a sirloin patty to make a burger, is that better for me than ground chuck? Also if I pressed it between paper roll to get the grease off does that significantly decrease the fat content? I like making my own burgers and have rationalized this as a healthier option than going to burger...

Homework Statement a dam of height H has a hole half way down to the base. how far outward from the base does the stream hit the ground? Homework Equations The Attempt at a Solution i think you have to use bernoulli's equation right? first find velocity then distance x right?

If initial vetical velocity is zero, at what time and how fast does a skydiver hit the ground? Assume that g=10m.s^-2 Given that: y' = -gt + A y' is the vertical velocity y = -(1/2).g.t^2 +At +B y is the distance above the ground In order to...

I'm so over my head that I don't even know how to ask this, but here goes... The accelerometer in my device (an iPhone) gives an x,y,z vector that points to Earth. I'm using these values to determine the angle of the device relative to the horizon. Visualize a user aiming the device at a...

Homework Statement State wether atom is in ground or excited state. Homework Equations A.1s22s22p3 B.1s22s22p63s23p64s23d104p55s24d7 C.1s22s22p63s23p64s23d6 The Attempt at a Solution A. Ground because all are filled in order. B.Excited because the 5s sub-shell isn't quite...

Hello all I work at a BC Ski-hill... what I need is a method to quickly but accurately measure the depth of dense snow (man-made snow, some might call it ice). Traditional method of mechainically boring through to ground is slow, inaccurate & messy. New GPS based methods require detailed gps...

I am an A-level teacher so I don't want an answer in terms of anything too complicated (for my students!) The hydrogen atom has a ground state energy of -13.6eV. I am happy with this. This means that the electron needs 13.6eV of kinetic energy in order to become free of the nucleus...

Homework Statement You have a solid, homogenous ball with radius R. Before falling to the floor, its center of mass is at rest, but it is spinning with angular velocity \omega_0 about a horizontal axis through its center. The lowest point of the ball is at a height h above the floor. When...

Suppose a 136 kg manhole cover is launched 50 feet in the air. What is the speed of the manhole cover when it hits the ground on its descent, in m/s and mph? I converted 50 feet to 15.24 meters, but I do not know what equation to use here. I understand that acceleration due to gravity is...

Homework Statement The Egyptian's sled system had a rather high coefficient of static friction (0.7) but a much lower coefficient of kinetic friction (0.3) How much force is required to start a block moving on level ground? We know the block is 1980 kg and after that: Assume that one...

In the short time I've been here I've already noticed this forum seems to lack a good definition of electrical ground or earth, posters seem to mean different things when they use it. Sorry if this is the wrong place to air this but it seems to have popped up in several different places in...

Homework Statement In a typical lightning strike, 2.5 c flows from cloud to ground in 0.20 ms. What is the current during the strike? Homework Equations I = Q/t The Attempt at a Solution The reason I keep getting this wrong is because it says I am rounding something off wrong. I...

Hi, Some of the ICs for a portable device I'm making need to be attached to ground. However, the device needs to be wireless so I can't ground it the way we usually do. Is there any way around this, such as a circuit that could somehow act as ground? Thanks.

Assume 2 bullets-- Exactly the same outside size and dimensions, Exactly the same velocity in OUR atmosphere. One Bullet weighs more than the other-- You shoot them straight into the air-- which one hits the ground first? How about if you shot them horizontally? Is there any webiste...

Homework Statement when using E=(h(pi)n)^2/(2mL) h=h bar m= mass of particle L= length this may be a dumb question but is the ground state 0 or 1 for n n=0,1,2...

Homework Statement A model rocket initially at rest on the ground is fired vertically upward, and the engine thrust produces a constant acceleration a = 40 m/s2. After running for 2.5 s the engine is cut off and then the rocket is in free fall. (a) Find the maximum height that the rocket...

A canister is dropped from a helicopter 500m above the ground... A canister is dropped from a helicopter 500m above the ground. Its parachute does not open, but the canister has been designed to withstand an impact velocity of 100m/s. Will it burst or not? I did the problem, but the back of...

Calculating Speed of Falling Banana - "Just Before" it Hits Ground? Homework Statement "A monkey drops a banana. Its weight is 1N. It falls 3 metres to the ground. What is the speed of the falling banana just before it hits the ground?" Homework Equations Not sure, but I'm guessing I...

Homework Statement Two neutral spinless particles of mass m are gravitationally bound to one another. What is the ground state energy of this two-particle gravitational atom? Homework Equations The Attempt at a Solution So, it's a two particle system, but H_{total} = H_1 +...

Homework Statement hello:D I have a pole (no associations!) and I am leaning it over ground that it stands making a angle of \phi between ground and pole length. What are the forces working in down finish of this pole, the one who is going vertically down, and going horizontally? thanks for...

Hi, i worked through several examples where the ground state energy of a particle in an arbitrary potential V(r) is estimated with Heisenberg's uncertainty relation. In these examples they prepare the Hamiltonian for the particle. For example the Hamiltonian for a particle in a harmonic...

Coriolis effect -- time to ground This is not a homework problem, I just have a conceptual question. Does the presence of the Coriolis effect, make a difference in how long it takes for a project tile to hit the ground. Obviously it makes a difference in its final location, but the time? Thanks!

In this schematic there is two potential transformers on the left and two current transformers on the right. The potential transformers on the left are connected together by a wire between X2 of the left transformer and X1 of the right transformer. Then there is a wire that must come from one...

Homework Statement A jet flies with an airspeed of 310 mph due east (assuming +x is due east). It is climbing vertically with a velocity of 50 mph. A wind blowing toward northeast has a speed of 55 mph. Homework Equations Find the x,y,z components of the plane's velocity relative to...

Homework Statement Calculate ground state of erbium [Xe] 4f^12 6s^2 The Attempt at a Solution so i know that the f orbital can hold 14 electrons and has 7 types of orbitals that is -3,-2,-1,0,1,2,3 So i constructed a table with axes of m_l (-3 to +3 above) and m_s. Then hunds rules...

When an apple falls to the ground does it not exert some gravity of it's own on the Earth and thus shortening the distance it falls? Why is it always assumed the Earth does not itself move in physics problems?

I have heard (what I consider to be) a myth of a pole lifting off the ground before it hits. That is, set something like a telephone pole up on end with no initial falling velocity, then let it drop. The claim is that the bottom of the pole actually lifts from the ground before the whole thing...

if the ground state is non-degenearate, this is easily understood But what if the ground state is non-degenerate?

What hits the ground first?? Homework Statement If we simultaneously throw two tennis balls horizontally from the top of a building, one at 10 m/s and the other at 14 m/s. Neglecting the air resistance, which one will hit the ground first? Homework Equations i don't think we use...

Homework Statement A plane flies in the direction 120 degrees with an air speed of 300mph. The wind is blowing north to south at 40mph. Find the course and ground speed of the plane. Homework Equations The Attempt at a Solution I attempted this problem, but i still cannot figure...

If you make the length of a finite well shorter, then the energy levels should increase, because for example the uncertainty principle. But can the ground state, when squeezed, have such high energy that the energy is greater than the potential of the well? Does that even make sense?

1. In a certain gamma decay process, an excited neon atom emits a gamma-ray that has an energy of 1.630 MeV. The neon atom in the ground state has a mass of 19.992 435 u. What is the mass of the excited neon atom? 2. I am pretty lost here. There must be a formula relating these...

In a regular household plug-in, there are 3 prongs: positive, negative, and ground. But, when doing wiring projects, many times they refer to the negative lead as the ground. Why is it that this lead is sometimes referred to as the ground, while other times, the ground is a completely separate...

Homework Statement A 3000kg cannon fires a 14 kg shell horizontally with a muzzle velocity of 450m/s. The cannon recoils for a distance of 2.5m before coming to a stop. What is the coefficient of friction between the cannon and the ground that it rests upon? mcannon= 3000kg mball=14kg...

Homework Statement At t = 0 a rubber ball of mass m is dropped from a height of 10 m. (i) When does it reach the ground? How fast is it moving when it hits the ground? Each time it bounces, the ball looses 20% of its energy. (ii) Calculate the height it reaches on the 1st bounce, and the...