Ground Definition and 945 Threads

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...

A flowerpot is knocked off a balcony 20.0m above the sidewalk and falls toward an unsuspecting 1.75-m tall man who is standing below. How close to the sidewalk can the flowerpot fall before it is too lat for a warning shouted from the balcony to reach the man in time? Assume the man below...

Homework Statement An object is dropped from a height of 25m above the ground. What is the average velocity of the object as it falls to the ground? Homework Equations d=vit+1/2at^2 The Attempt at a Solution d=-25 a=-9.8 vi=0 -25=-4.9t^2 t=2.3s vavg=displacement/time...

Homework Statement A ball is kicked from the ground at an angle of 65° and at a speed of 8 m/s. What is its speed when it reaches 1/2 of the maximum height along the path, assuming that air resistance is negligible? My head hurts from this. I made a diagram of this event by using a...

Hi, A skydiver accelerates towards the ground at at 9.81ms ^-2. At the instant that je leaves the aeroplane. A) The skydiver opens his parachute. Explain why he reaches a terminal velocity shortly afterwards. If you could help with that question be very greatful Thanks in advance JImmer

Homework Statement Most of the particles known in physics are unstable. For example, the lifetime of the neutral pion, \pi^{0}, is about 1.0 x 10^{-16} s. Its mass is 1.35 x 10^{8} \frac{eV}{c^{2}}. What is the energy width of the \pi^{0} in its ground state.Homework Equations \Delta E\Delta...

Homework Statement To basketball player bounces the 0.60-kg basketball to another player by bouncing it off the court. The ball hits the court with a speed of 6.5 m/s at an angle of 50° from the vertical. If the ball rebounds with the same speed and angle, what was the impulse delivered to...

Homework Statement A ball is kicked at a velocity of 40.0 ms at 60 degrees above the horizontal/ a) When is the ball 25.0m above the ground? The Attempt at a Solution First i broke them down into there x and y components but having problems on the (25.0m) part. I did Vix = 40 cos 60 = 20...

Ok basically I've tried loads of methods of working it out and I'd just like to see how someone else would do it because all the answers I get don't seem right and I am not confident about them. A bit of explaining of why things that may seem odd are wouldn't be minded elther. I've tried...

1. A 10 kg box on a level surface is attached by a weightless, unstretchable rope to a 7.0 kg box which rest on a 30 degree incline. Find the rate of acceleration and the tension in the rope if... a) there is no friction ... b) coefficient of friction is 0.10 for both boxes 2. F_net...

Homework Statement a) To get a wave function for a situation in which the energy is close to E_0 and the atom is almost certainly in one of the minama of the potential energy , consider the functions \varphi_t(x)=[(\varphi_0(x)+\varphi_1(x))/(2^(1/2)))...

Homework Statement What is the calculated binding energy of the electron in the ground state of (a) deuterium, (b) He^{+} and (c) Be^{+++}? Homework Equations For the hydrogen atom, E_{n} = - E_{o} / n^{2} E_{o} = me^{4} / 2hbar^2(4\piEo)^2 The Attempt at a Solution Not sure...

Homework Statement A projectile is launched from the top of a cliff with an initial velocity of 20m/s at 30deg. above the horizontal. It hits the ground 3.0s later. Given projectile range is 52m and height is 14.1m, how do i calculate it velocity(magnitude and direction) 0.1s before it hits the...

I'm confused about voltage divider circuits. I learned that the output voltage is larger than the input voltage when R1 is smaller than R2. Let's say R1=5Ohms and R2=10 and Vs=9V. Then Vo=6V! Why is the voltage lower? Did I do something wrong? (I used a voltage divider calculator, by the way.)...

Homework Statement Imagine that our simple single layer atmosphere model derived in class now has 2 atmospheric layers. It is transparent to visible light but a blackbody for IR a) Write the energy budgets for both atmospheric layers, for the ground, and for the Earth as a whole. b)...

[b]1. Homework Statement [/b ]http://teacher.pas.rochester.edu/phy121/PracticeExams/FinalExam/FinalExam_files/image015.jpg This is not the exact picture, instead of having M1 there let end of the string be connected to the ground instead Find the tensions and accelerations Homework...

Homework Statement At the entrance of Ambrose Channel at New York harbor, the tidal current at one time of the day has a velocity of 4.2 km/h in a direction 20 degrees south of east. Consider a ship in this current; suppose that the ship has a speed of 16 km/h relative to the water. If the...

Homework Statement Hi all - I've done all but the last part of this problem, for which I have the solution, but I was hoping someone could explain why the solution is what it is :) q:The Hamiltonian of a quantum system suddenly changes by a finite amount. Show that the wavefunction must...

Homework Statement Canadian geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 km/h . If one such bird is flying at 100 km/h relative to the air, but there is a 30.0km/h wind blowing from west to east...

This is a 2d problem. If I drop a ball with mass m from a height L over ground. How large is the interval that the ball can possibly be on if m = 1 g and L = 2m. Use the uncertainty principle \Deltax\Deltap ~h to determine the interval. Am I supposed to think of this as a classical...

What is the principle of virtual ground? Please elaborate. Attempt: The input impedance of an op-amp is so high that virtually all input current is shunted to the feedback resistor when is works as interver. When noninverting input is grounded and internal resistance of op-amp is very high...

My college Physics class keeps on increasing my interest for physics, and I'm getting bored of the in class work so I've decided that I want to try to make a physics engine so that I can play around with physics and help myself learn more of it without being confined to just what my professor...

I mean, a book that states the basic axioms of contemporary mathematics and then proceeds to prove/derive things based on those axims. Something like a contemporary mathematics version of Euclid's Elements?

For general house wiring. As I understand it, the ground will carry away harmful power when there is a fault in the neutral let's say a wall outlet that has a load plugged into it. What keeps power from going to ground normally? Is the ground only available when a load is plugged into the...

Hi all, If I take a battery (lets assume a car battery) and connect the +ve end to Earth Ground and leave the -ve end floating. Why is there no charge transfer from the battery to ground? I've read up on a variety of threads regarding this question on this forum. Haven't quite found my...

i am now reading some materials on lanczos algorithm, one of the ten most important numerical algorithms in the 20th century my puzzle is, why it is useful for finding out the ground state energy? i can not see anything special about the ground state energy in the algorithm

0. Homework Statement What is the force required to unstick a semi sphere from the ground if the pressure inside the semi sphere is lesser than the one outside it? Assume the semi sphere has a radius of r. 1. The attempt at a solution \Delta P = \frac{F_{\text {net}}}{A} where A is...

hi there need help i just need to know why ground and neutral ( A.C CIRCUITS) short together on the body of machine chassis or panels.i found this in one oil heating unit ,with high wattage of heating element. who ever can reply ,highly appreciated with thanks

microwave can be used to engineering potentials for alkali atoms i find that in the literature, people only take the magnetic dipole transition into account why the electric dipole transition is neglected? is it forbidden?

Homework Statement A plane flies 2750 m[W] in 25s and then 5810m [S] in 67s a) What is the average speed of the plane? b) What is the average velocity of the plane? I tried doing it and I don't know if I'm right. My physics teacher can't explain anything for beans so could you please explain...

Homework Statement A bullet is fired from a cliff 36m above the ground. If the bullet is fired at an angle of 25 above the horizontal, and has a muzzle velocity of 80m/s, what is the velocity of the bullet as it hits the ground? d = 36m vi = 80m/s angle = 25 degrees Homework Equations...

Just a short question. I have five energies. -25 eV -5 eV 0 eV 5 eV 25 eV The textbook definition is that the ground state is the state with the lowest energy, i.e. I believe 0 in this case. But that is taking the absolute value of theenergies. In reality the lowest energy is...