Box Definition and 1000 Threads

if a black box was given,with two wire pull out from the box.no other additional info was given,then how will you determine the impedance in the circuit?what is the resistance?if given that is a passive circuit,what will the circuit look like? seem the task quite challenging.

Hi guys i thought I've seen a thread on this before but i was wondering, supposingly you have a black box which is totally airtight and made in such a way nothing, not even an atom is capable of escaping from the box. This box is also 100% reflective on all sides and in the middle of the box...

Homework Statement \Psi(x,0) = \frac{1}{\sqrt{L}}, ~~~~~~ \left|x\right| < L/2 At the same instant, the momentum of the particle is measured, what are the possible values, and with what probability? Homework Equations The Attempt at a Solution Well, I know that \Delta{}x = L so can I then...

Homework Statement Let B be a solid box with length L, width W, and height H. Let S be the set of all points that are a distance at most 1 from some point of B. Express the volume of S in terms of L,W, and H. Homework Equations 4/3(pi)r The Attempt at a Solution I have gotten to...

Homework Statement A heavy box (200.0 kg) is sitting still on a warehouse floor, despite the efforts of a worker to push it (with a force of 300.0 N). If the coefficient of static friction between the box and the floor is 0.6, what is the friction force between the box and the floor? What is...

I have the solution to the problem but I don't get the part how you rotate the axes and then solve from there. For example in the x direction Fx = max +mg sin32 = max Fx = Force in x direction ax = acceleration in the x direction Can someone explain this?

Homework Statement Is there another way to do this question? Is this right? L = 50-2x W = 40-2x Height= XHomework Equations // V=L x W x H V= (50-2x)(40-2x)(x) V= (2000 -180x +4x²)(x) V= 2000x -180x² +4x³ V= 4x³ - 180x² +2000x V' = 12x² -360x +2000 X = (360 (+/-)sqrt(360²-4(12)(2000))) /...

I just spotted another thread where the poster asked "can a modern scientist be religious". I thought about it and I realize that my crazy notions are some of my biggest motivators behind me aspiring to become a scientist. There could be unseen phenomena all around us that is yet to be...

problem is attached as image... i asked on yahoo answers, received a reply but is wrong... it is very challenging (in my opinion).. I spent over an hour without reaching even a wrong option..

Homework Statement The coefficent of static friction between the floor of a truck and a box resting on it is 0.38. The truck is traveling at 69.7 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide? Homework Equations The Attempt at...

A 3kg block starts from rest at the top of a 30degree incline and slides a distance of 2m down the incline in 1.5s find the magnitude of the acceleration. I have always though to find the acceleration you can just use x/(t*t) but i use this formula but i couldn't get the same as the book. is...

I have no background in physics, but I have a question about light. Might consider it the 'Light in a box theory'. What would happen if you could make a box or sphere of mirrors that would constantly accept incoming light and focus the light into an infinite loop with little or no...

Homework Statement This is problem 2.4 from Griffiths, where he asks to find the expectation value of the position of a particle in a box. Homework Equations Schrodinger equation. The Attempt at a Solution I wrote that \frac{2}{a} \int_0^a x (sin(\frac{n \pi}{a} x))^2 dx =...

1. See Attachment 2. None 3. a. I found the volume of the box which is like this x(24-2x)(24-2x) = x(576-96x+4x2) = 4x3 - 96x2 + 576x = 4(x3 -24x2 +144x) but how do I find the domain? b. and c.How do I use...

Homework Statement Hello everybody: I have a problem with the Schrödinger equation in 3D in spherical coordinates, since I'm trying to calculate the discrete set of possible energies of a particle inside a spherical box of radius "a" where inside the sphere the potential energy is zero...

Hello :smile: I'm really stuck on a question and could do with some help. Homework Statement http://img268.imageshack.us/img268/2161/19947313.jpg Homework Equations http://img139.imageshack.us/img139/3478/24591171.jpg The Attempt at a Solution...

Dear all, I need to evaluate some data from questionnaires (in the form of scale of values from 0 to 10) and I thought to use the box plots. Please, someone can provide me with some helps (references,etc) for the interpretation? In some cases, the median does not falls inside the box but it is...

Hello: Can someone help with the following: A 2.0 kg box on a frictionless incline of angle theta = 40 is connected by a cord that runs over a pulley to a light spring of spring constant k = 120N/m. The box is released from rest when the spring is unstretched. Assume pulley is massless and...

If the amount of data contained in a aircraft black box was not too large could such info be sent out on an additional aircraft radio channel and collected for all aircraft in real time thus eliminating the need for physical black boxes? At least then we would not have to search the bottom of...

Hi I've been reading through the book "Quantum Field Theory: A Tourist Guide for Mathematicians" by George B. Folland. On page 101, he describes the construction of a scalar field "in a box" \mathbb{B}: \left[-\frac{1}{2}L,\frac{1}{2}L\right]^3 in \mathbb{R}^3. Here \bf{p} lies in the...

I have an out-door cabinet (with PCB) that over time is being damaged due to condensation (humidity). I would like to minimize these damages over time (corrosion, etc...) The cabinet is closed but not 100% sealed. Cabinet size is 80X20X20cm. How do I avoid the damages due to condensation of...

Question Free particle in 1D where V(x) = 0. There is a general boundary condition \psi(x+L)=e^{i\theta}\psi(x) used for box normalization which has arbitrary phase theta. E=k^2\hbar/(2m) is true for free particle energies. Attempt Comparing with the condition \psi(x+L)=\psi(x) I don't see...

Homework Statement A mass (weight 100g) is hanged on a spring inside a cubic box (side a=1m). Stiffness of the spring is 10N*m-1. Equilibrium state of the spring is right in a centre of the box. Now, we let the box fall to the ground from height h. Describe a behaviour of the mass inside...

Quantum mechanics says measurement of observable always produces result that is one of eigenvalues of that observable. Subsequent measurement yields same value. For a particle in a box with infinite potential barriers if measure momentum doesn't that put system in eigenstate of momentum insuring...

Homework Statement N atoms are in two boxes, box A: volume=V, and box B: volume=3V. (Assume a atoms make up a low density perfect gas). 1) How many ways can n be chosen, where n=(number of atoms in box A)? 2) Each atom if allocated a spatial state. Assuming that the number of available...

Homework Statement Consider an electron that is constrained to be in a one dimensional box of size L, but is otherwise free to move inside the box. i.) Write down the (time independent) Schrodinger equation for this particle, the boundary conditions for the wavefunction Ψ and find an...

Homework Statement A 250 N force is applied at an angle of 32° above the horizontal to a 96 kg wooden box causing it to slide along a floor as shown. The coefficient of friction between the floor and the box is 0.18. What is the magnitude of the net force on the wooden box? The Attempt at a...

Homework Statement Assume we have an infinitely deep square well of length L, with the left edge of the well at -L/2. Assume U = 0 at the bottom and infinity at the top. A) Using the time independent Schrodinger Equation, derive the wave equation for a particle trapped in this well. Make...

Homework Statement (a)Think of a one-dimensional box of length L. There are two identical, non classical particles of mass m in the box. The total energy of the system is 13*pie^2h^2/2mL^2. What states are occupied by by the two particles? (B) If a single non-classical particle of mass m in a...

I need to calculate the efficiency of a inclined plane if a 60 pound box is being pushed up it... The inclined plane is 16 feet long (The plane itself, not the base) and it is raised up 4 feet high. Homework Equations efficiency= useful work output/total work input w=fd w= work...

Homework Statement A cubic metal box that has 27.8-cm (.278 m) long edges contains air at a pressure of 1.00 atm (~101,300 Pa) and a temperature of 303 K. The box is sealed so that the enclosed volume remains constant, and it is heated to a temperature of 416 K. Find the force due to the...

Homework Statement A particle is in a box of width L. Calculate the probability to find the particle in the region [L/4, 3L/4] when the particle is a) in the ground state b) in the first excited state. Homework Equations (2/L)sin(n*π*x/L)^2 dx is the probability in [x, x+dx] The...

A box 80.0N is to be pulled across a smooth horizontal floor with a force of 20.0N at an angle of 60 degrees to the horizontal. What acceleration will be produced? I know this probably seems simple, but I have searched my lecture notes, my textbook and the web but I can't find out how to...

I am fairly new to QM and am learning many of the basics right now. We were just discussing conservation of operators (energy, momentum, etc) and I recalled a problem proposed in my textbook about a 1D particle in a box of length L. at a time t, the box suddenly expands to t=2L, in which time...

Hello everyone, I have a beam deflection problem. I haven’t looked at deflections for a while now and I can't understand why my solution is a million miles out fro the results I have seen through testing. Problem: I have a beam made from 100x40x3mm mild steel box section which is...

Please take a look at the slides attached. Suppose I apply a force F on the right hand side and another on the left hand side as shown in the following diagram. Suppose that the material can be stretched. Now one of my friends said that the extension is delta due to a force F while another...

You and your friend Peter are putting new shingles on a roof pitched at 24^\circ . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.4 m away, asks you for the box of nails. Rather than carry the 2.4 kg box of nails down to Peter, you...

Problem 3: Two forces are exerted on a ring. The first force is a force of 20 N, 30 degrees North of East, and the second force is 15 N, 10 degrees West of North. What is the magnitude and direction of the equilibrant that keeps the ring from moving? Show all work. Problem 4: A 75-kg...

If I built a box out of 2 inch thick wood, and made it air tight, would the light waves inside the box eventually dissipate and become absolutely zero? (meaning absolutely no light whatsoever)?

Homework Statement Twenty balls labelled 1 through 20 are put in a box. Eight balls are randomly selected from the box without replacement. Let x denote the largest number selected. (a) Denote by m the smallest possible value of x. Write down the value of m. (b) Let k be any integer such...

Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in an experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega. However, I have tried several times to solve the problem, but keep arriving at a theoretical...

Homework Statement An electron is confined to the region of the x-axis between x = 0 and x = L (where L = 1nm). Given a state n = 3, find the location of the points in the box at which the probability of finding the electron is half it's maximum value Homework Equations...

Homework Statement a rectangular box with no top is formed by cutting out equal squares from the corners of a square sheet of metal, 10 cm by 10cm, and bending up the 4 sides. What size of square must be removed from each corner to generate a box with a volume of 50cm^3? (Note: there are 2...

Homework Statement Consider a particle in a one-dimensional “box” with sagging bottom v(x) = -V_0sin(\pi x/L) for 0 \leq x \leq L infinity outside of thius (x > L, x < 0) a) Sketch the potential as a function of x. b) For small V_0 this potential can be considered as a...

I am trying to understand the cooper pair in a box. They don't seem to behave like normal particles. Can someone point me to a good intro. Especially on that focuses on how they are not like a quantum well. Some questions: 1) Does the cooper pair in the box see anything of the geometric shape...

Do people agree with this?

Homework Statement hi Homework Equations The Attempt at a Solution

Homework Statement Suppose a box on a frictionless ramp is being pulled by a rope with a tension of 350 N making an angle of 50° to the horizontal ground. If the angle of incline of the ramp is 20°, and the box is pulled 5 m, determine the amount of work done. Hint: Draw a diagram and use...

I am told in the problem that i am to minimize the amount of cardboard needed to make a rectangular box with no top have a volume of 256 in^3? I am to give dimensions of box and amount of cardboard needed. Can anyone help

Homework Statement A box has an intial speed of 10 m/s. It slide across a flat section and then up an incline. Use L=20m, \muk=.1, and \theta= 40 degrees. Note that I have not given you the mass. It will cancel out of all the equations in the end. a. Determine the speed of the box at the...