Ground Definition and 921 Threads

Homework Statement you drop a ball over the edge of a 350m high cliff. If T=15 deg celcius when will hear it strike the ground? Homework Equations time=distance/speed The Attempt at a Solution do i just divide the 350m by the speed of sound in air at 15 deg celcius?

Let's say I have a one-kilogram object, and I drop it from heights of 1 meter and 2 meters, respectively, ignoring air resistance/friction and so forth. Are the following statements true? The objects hit the ground with the same force since the mass and acceleration (due to gravity) do not...

Homework Statement Calculate the probability for finding the ground state harmonic oscillator beyond its classical turning points. Homework Equations Psi n(q) = (alpha/pi)^(1/4) exp(−alpha*q^(2)/2), where alpha = (kμ)^(1/2)/h bar The Attempt at a Solution i know it's going to be...

Jimmy tosses a ball with a velocity of 15m/s at 45degrees to the horizontal from a hill 6.2metres above ground. Find: -time of flight -horizontal range -maximum height -speed of the ball when its 3m below the hill -angle at which ball hits ground Thx alot, ANY help would be appreciated.

Hi All, i am a new bee. if an object is release from certain height with some initial orientation. how do i know, what will be its orientation after collision with the ground. Thanks and Regards, K.Prabhakar

[SOLVED] Find the ground state energy [b]1. A particle is confined to a one dimensional box. Two possible state functions and the corresponding energies for the particles are shown in the figure. Find the ground state energy. EA=4eV EB=9eV Homework Equations...

Homework Statement Bush fir patrols sometimes drop small bomb to start a controlled burn off from aeroplanes. Peter was flying his over a forest at constant horizontal speed of 75m/s and at contsant altitude of 490m when he dropped the bomb. A) how long does it take for the bomb to hit the...

Hiii All (:) ) It feels nice to be back here... I have got questions about time... --Whats the ground breaking research done about sense of time ? As far as i can see time can't be sensed..right ? we have got 5 senses but all those senses seem incapable at sensing it..where as on the...

The John Hancock Center In Chicago Is The Tallest Building In The United States In Which There Are Residential Apartments. The Hancock Center Is 343m Tall. Suppose A Resident Accidentally Causes A Chunk Of Ice To Fall From The Roof. What Would Be The Velocity Of The Ice As It Hits The Ground...

[SOLVED] Putting a ground in between circuit If i put a ground in between the two resisters that are in series of a circuit, will the current go through the ground wire and NOT the 2nd resister. Example.. this is not a hwk question by the way. I just drew this right now on paint...

Homework Statement Particle is in a tube with infinitely strong walls at x=-L/2 and x=L/2/ Suppose at t = 0 the electron known not to be in the left half of the tube, but you have no informations about where it might be in the right half---it is equally likely to be anywhere on the right side...

Hello, I opened up an AC to DC power supply today to see where they connected the Earth ground wire and I found that it's connected to the negative side (labeled V-) of the DC output. V- is also connected to one side of the transformer's output. Why would they connect the Earth ground wire in...

Six, 6.6kV ,3phase, alternators are connected to a common set of bus bars. Each has positive negative and zero sequence reactances of 0.90 ohm, 0.72 ohm, 0.30 ohms respectively . An Earth fault occurs on one bus bar . Determine the value of fault current if all alternator neutrals are solidly...

ground states Homework Statement Is it generally true that the ground state of a given quantum system corresponds to the lowest quantum numbers? For instance, is it generally true that the ground state of a system governed by a radial potential always corresponds to l=0? If not, how do we...

A projectile is fired from 35ft above the ground level at an angle 35 deg. It hits the ground 100 ft away (horizontal distance). Find initial speed, travel time and max hight above the ground. can somebody solve this or point me in the right direction, thank you!

urgent physics help! The airspeed of a small plane is 200 km/h. The wind speed is 50.0 k/h from the west. Determine the velocity of the plane relative to ground if the pilot keeps the plane pointing to each of the following directions: a) [E] ☺ b) [W] ☺ c) [N] ☺☺☺ d)...

I was going through the method of image charges and came up with this "infinite grounded conducting plane". What i wanted to ask is that in reality how do you actually maintain a conductor at zero potential w.r.t. infinity? What does "grounding" mean?

Homework Statement How many unpaired electrons are present in each of these species and what is the ground state? Given:1s2 2s2 3p1 Homework Equations none The Attempt at a Solution what is the ground state? I can find the number of unpaired electrons.

ok this is a poject i need ideas etc and physiological explanations on how can run without falling over on uneven ground eg signals etc if i can get some fine detail it would be great involving neurons action potentials sensory conduction reflexs etc or even interesting paragraphs

XXZ model in 1-dimension, with external field, what is the exact form of its ground state wave function? Recently I've read the ground state wave function of XY model and was curious about the condition of XXZ. Do they have a similar manner? The XY result is attached below. Thanks.

[SOLVED] Vectors: air speed, ground speed I'm having trouble drawing the diagram for this question. Homework Statement An airplane with air speed 120 km/h is heading due north in a wind blowing due east at 50 km/h. What is the ground speed of the plane? Homework Equations Pythagoras...

Here's the problem: http://www.phys.washington.edu/users/karch/324/2007/hw3.pdf Just the first one. Okay, so my understanding is that the first state of Psi (ground state) is just an arc, like a Gaussian distribution, starting from 0 at E0 and finishing at 5a also at the level of E0...

Homework Statement how much work is needed to raise a 200-kg load of bricks 10m above the ground to a building under construction? Homework Equations The Attempt at a Solution

Homework Statement An airplane is flying toward the Southeast with a speed of 200 m/s, and the wind is blowing toward the Northeast with a speed of 60 m/s. A. Which direction will the plane head now? B. What is the groud speed of the plane? Homework Equations The Attempt at a...

I apologize if this is the incorrect forum for this problem; I was unsure which would be most suitable because the problem is from a low level astrophysics class but is not precisely or exclusively astrophysics. Homework Statement For a gas of neutral hydrogen atoms, at what temperature...

Homework Statement The speed of a ball is v_b= L/t + gt/2 at a height h_b above the ground. What is velocity when ball hits ground? Homework Equations v^2 = v_i^2 + 2gh_b The Attempt at a Solution Tried v_2 = v_i^2 + sqrt 2gh_b This doesn't work . Any ideas

Homework Statement A ball is thrown downward with initial speed of 8m/s from a height of 30m. Homework Equations \After what time interval does the ball strike the ground The Attempt at a Solution acceleration will equal -9.8m/s^2 because it's free fall would i use equation...

Homework Statement It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 8.00 every 5.00 and rises...

Homework Statement A hot-air balloonist, rising vertically with a constant velocity of magnitude v = 5.00 m/s, releases a sandbag at an instant when the balloon is a height h = 40.0 m above the ground. After it is released, the sandbag is in free fall. For the questions that follow, take the...

Homework Statement A ball is tossed up into the air. It reaches maximum height and comes back down. What is the net force on the ball at the following situations: a. The ball is moving upward as it is released. b. The ball is at it's highest point. (when it comes to a stop i suppose)...

A little plug for my supervisor and former group. After a couple of years work with a very clever (zero read noise) CCD and a bit of clever DSP programming they now have a system which takes a sequence of very short exposures, picks the ones in which the atmosphere is frozen to give an...

Hi Members I am preparing to do a presentation on possible research opportunities in ground penetrating radar before an Industry and academic audience. Anyone with information as to what is lacking or needs improvement in current BH or GPR research in the context of Data analysis (processing...

Hey! I know that with option A I have an always-open-line and no problems in communication... What I would like to know is, if option B will work when the ground is the building ground? Liad.:)

Homework Statement V(x) = k|x|, x \in [-a,a], V(x) = \infty, x \notin [-a,a]. Evaluate the ground state energy using the variational method. Homework Equations a = \infty and \psi = \frac{A}{x^{2}+c^{2}}. The Attempt at a Solution 1 =...

Hello there I'm currently working on an EM device that should be able to measure the humidity in the ground. I cannot give too many details, but let's consider the following issue: I have a copper closed loop in which I send some current to generate a magnetic field. But there are some EM...

There are a lot of people with a lot of different views and opinions around the world supporting themselves with various real and/or fictive data, graphs and predictions. Some of them are qualified and some are not. Others questions what difference qualification makes. Some has a clear political...

My professor decided to throw us a curveball to try and solve the following problem: A third baseman makes a throw to first base 38m away. The ball leaves his hand with a speed of 36m/s at a height of 1.7 meters from the ground and making an angle of 14 degrees with the horizontal. a)...

We are using 120V commercial grade electronic ballasts, properly grounded, rated at 2Amps to drive two low pressure UV lamps submerged in water rated at 800mA. System requirements are to use GFI barkers with each ballast. This installation in a wastewater treatment plant, where there are...

Homework Statement http://img253.imageshack.us/img253/4648/untitledfn3.jpg The Attempt at a Solution I've done parts a and b succesfully, but am not sure how to do c. :confused:

Homework Statement dan is gliding on his sb at 4m/s. he suddenly jumps backward off his sb, kicking the sb foward at 8m/s. how fast is dan going as his feet hit the ground? dan's mass is 50kg and the sb's mass is 5kg Homework Equations The Attempt at a Solution

Is the ground state of the infinite square well an eigenfunction of momentum?? If so, why. If not, why not??

i'm trying to figure out how much force it would take to remove a three inch piton driven into rock or concrete. For example, assuming the concrete in a 50 square foot parking lot was more than three inches deep, and you drove a 3 inch piton into the center of it, how many pounds of force would...

I am looking at a diatomic molecule where the Hamiltonian is given as H = l²/2I + F*d*cos theta where d is the dipole moment. The term F*d*cos theta is small. I write the energy of ground state as E_0 = \hbar*l*(l+1)/ 2I Than I have to determine how much the ground-state energy...

Homework Statement A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after begin hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 320 ft from where it was hit. How high is the...

I'm working all alone with nobody to help me, and now I'm stuck! :( I'd really appreciate it if you could help me out. I'm working with the ground state of the one electron hydrogen atom. Trying to determine the radial dependence on probability density. It should only depend on the radial...

Consider a helium atom where both electrons are replaced by identical charged particles of spin-1. Ignoring the motion of the nucleus, the Hamiltonian is [see attachment 1] Construct an energy level diagram ( qualitatively ) for this "atom", when both particles are in the n=1 state, and...

Hello. I'm trying to grasp this concept. The question states: An excited atom decays to its ground state and emits a photon of green light. If instead the atom decays to an intermediate state, what color of light might be emitted? I have the electromagnetic spectrum with the visible lights...

I've been told (in class, online) that the ground state of the 3D quantum harmonic oscillator, ie: \hat H = -\frac{\hbar^2}{2m} \nabla^2 + \frac{1}{2} m \omega^2 r^2 is the state you get by separating variables and picking the ground state in each coordinate, ie: \psi(x,y,z) = A...

can someone help me with this problem? I am not sure where to start from. if someone can give me some advice. While driving north at 25 m/s during a rainstorm you notice that the rain makes an angle of 38 with the vertical. While driving back home moments later at the same speed but in the...

if you spin a powerball in the shape of a cone it will reach 13000 rpm the idea is to nail a giant powerball to the ground at latitude 45º so it describes a cone and steal little by little Earth's angular momentum to generate energy do you think this is viable?