Ground Definition and 945 Threads

Homework Statement A stone is launched straight up by a slingshot. Its initial speed is 20.2 m/s and the stone is 1.40 m above the ground when launched. Assume g = 9.80 m/s2. A: How high above the ground does the stone rise? B: How much time elapses before the stone hits the ground? Homework...

Homework Statement A hot air balloon is rising upward with a constant velocity of 4m/s. As the balloon reaches a height of 4m above the ground the balloonist accidently drops a can of pop over the edge of the basket. How long does it take the pop can to reach the ground? V2 = 4m/s [up] v1...

Hi everyone, This question is from my problem set this week in my Phys 371 class. Any help, hints or ideas would be very much appreciated! "Use the Heisenberg Uncertainty Principle to estimate the ground state energy in the hydrogen atom. Since the wave function that solves this problem is...

Hello, yes another GROUNDING question :) Can anyone tell me why lightning wants to travel to the Earth? and what happens to all that current that it carries after going into the Earth. Like what does the Earth do with it.. are there positive ions that neutralizes everything or what?

[Ground"Ed" vs. Ground"Ing"] Why does the ground"Ing" wire in a circuit draw high amounts of current and trips the breaker when a ground"Ed" (neutral) wire does not?

I do not understand the concept of electrical ground, or why it works. Let me explain. In elementary school physics, one learns that for a current to take place, you need a battery with positive and negative poles. This creates a voltage that makes charges run from plus to minus, because...

I am about to install an electric outlet . There are three wires to and I am not sure which one is the ground wire . All wires having the same color ! How can I determine which one is the ground ?

Hi, please let me know the purpose of having a ferrite bead isolation for ground (between digital and power)? as far as i understand. the ferrites will be helpful in case of power noise filtering. And noise from digital line return path wouldn,t affect the power levels as it might do for...

If two objects of equal mass are dropped...one from h1 and the other fro h2...will they hit the ground with the same force? Because the only force acting on the objects is gravity so we can say: F=ma and the acceleration is constant...so the forces must be the same. Is this correct...

Homework Statement A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.6 s after being hit. Then 3.1 s after reaching its maximum height, the ball barely clears a fence that is 87.5 m from where it was hit. Assume the ground is level. (a) What maximum...

[b]1. At a particular instant, a stationary observer on the ground sees a package falling with speed v1 at an angle to the vertical. To a pilot flying horizontally at constant speed relative to the ground, the package appears to be falling vertically with a speed v2 at that instant. WHAT IS...

When kicking off the ground, what is the maximum amount of force that human's can exert? Any references?

[SOLVED] Airplane propeller and plane's velocity relative to the ground. Homework Statement An airplane propeller rotates at 2200 rev/min while the airplane flies at a speed of 550 km/h relative to the ground. The plane's velocity is parallel to the propeller's axis of rotation. Part a)...

[SOLVED] A box of mass 8.0kg is being dragged along the ground by a force of 30N. Homework Statement A box of mass 8.0kg is being dragged along the ground by a force of 30N. (a) If the friction force is 26N what is the resulting acceleration? (b) If the frictional force is one-quarter of the...

Homework Statement 1 A light plane is traveling at 175km/h on a heading of 8° east of north in a 40-km/h wind from 80° east of north. Determine the plane's ground velocity. Homework Equations cosine law The Attempt at a Solution I found the resultant to be 191 km/h but the...

[SOLVED] Perturbed Ground State Wavefunction with Parity Homework Statement A particle is in a Coulomb potential H_{0}=\frac{|p|^{2}}{2m} - \frac{e^{2}}{|r|} When a perturbation V (which does not involve spin) is added, the ground state of H_{0} + V may be written |\Psi_{0}\rangle =...

Hello All, I was talking to a friend about how to properly isolate a digital board from a high-powered output stage. The output stage in my application make square wave pulses that can be as high as 500V. So my first thought was to galvonically isolate the output stage circuitry from the...

(1) How do you identify Ground roll on a shot record? Is it just the polarized nature of the ground roll that leads to its recognition on a shot record? (2) What is the importance of the Fresnel zone? and What does it depend on?

Homework Statement Given the attached scheme, if R_{1}=R_{2}=R_{3}=10 Ω and \epsilon_{1}=20 V , \epsilon_{2}=10 V determine the potentials at the points A,B,C,D,E. The sources of emf have no internal resistance. Homework Equations My question is: Why is it that no current exists along...

so I had this thought earlier today. I am not claiming this is true or even likely but its interesting, possible (from everything I know), and may be testable by experiment. What if annihilation doesn't actually exist? What if what we see as an electron annihilating with a positron is...

I got a question regarding ground in terms of a power supply and another one with regards to PCBs. Usually you see people put a jumper cable between the negative terminal of a power supply to common ground. Why do people do this? Is it for the user to reference the power supply to actual...

Homework Statement a 3 kg ball is dropped from rest from the roof on a building 176.4 m high. While the ball is falling, a horizontal wind exerts a constant force of 12 N on the ball? Part 1) How long does the ball take to hit the ground? Part 2) How far from the building does the ball hit the...

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...