Box Definition and 1000 Threads

I figured this is the best place for asking this question. My apologies for those that find it inappropriate. I am looking for an image of the engineer's magic box for a powerpoint :(. If it has a proper name, please tell me. See the attachment for my MS Paint representation.

Just got a new computer. Has nothing on it but XP. Plugged a network cable into it and into my router. The network port is directly into the back of my computer, not into an add-on slot or anything. System does not detect any hardware. It does nothing. Shouldn't it detect the network? If...

Homework Statement For a system consiting of a single particle of mass m in a box of volume L^3 (Lx = Ly = Lz = L) develop a relation between the number of accessible states, Ω(E) and E Homework Equations E = ((π^2ћ^2)/(2mL^2))(nx^2 +ny2 +nz2) The Attempt at a Solution nx^2 +...

Homework Statement A dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of θ to the horizontal. The figure below gives, as a function of time t, the component vx of the box's velocity along an x-axis that extends directly up the ramp. (The vertical axis...

Hi. Can I have some help in answering the following questions? Thank you. Let {f_n} be a sequence of functions from N(set of natural numbers) to R(real nos.) where f_n (s)=1/n if 1<=s<=n f_n (s)=0 if s>n. Define f:N to R by f(s)=0 for every s>=1...

A particle is confined inside a rectangular box with sides of length a,a, and 2a. What is the energy of the first excited state? Is this state degenerate? If so, determine how many different wave fuctions have this energy. The relevant equations are E=Ex+Ey+Ez =((hbar^2*pi^2)/2m)...

Homework Statement A box containing a particle is divided into right and left compartments by a thin partition. We describe the position of the particle with a 2D space with basis states |R> and |L> according to whether the particle is in the right or left compartment. Thus, a generic state is...

Homework Statement A man is pushing a box on top of a plane that is inclined 20 degrees above the horizontal, with a distance of 10 m. The weight of the box is 20 kg and the coefficient of kinetic friction is 0.30. The velocity is constant. How much force is exerted by the man? Find the work...

Can I draw conclusions from the curvature of a wavefunction on the kin. energy of the particle? For instance, the lowest bound solution of a particle in the box is a half of sinus: Psi(x) = sin(pi*x/L) Since the second deriv. of a wavefunction is proportional to the kin. energy, this would...

Homework Statement A box sits on an inclined plane. Given its mass and the angle of the incline, what is the magnitude of the normal force? Homework Equations I don't know- my understanding is N=mgcos(theta), but my physics textbook says otherwise... The Attempt at a Solution My attempt at...

Homework Statement http://i885.photobucket.com/albums/ac52/HummusNFalafel/showmepl.jpg A empty cardboard box is placed in an electric field pointing upwards with a strength of 1200 N/C as shown above. The bottom of the box is tilted up by an angle Θ = 13° from the horizontal. Side A of the...

When the cat is poisoned in its box then isn't that an observation? So when we open the box after an hour and see it dead it is the 2nd observation? I cannot see what this thought experiment proves at all BECAUSE an 'observation' was done or not done on the cat before the lid was opened. Its...

Suppose we have a photon bouncing around in a massless mirrored box - does this system have inertial and/or gravitational mass? To be more realistic, if we have a massive black body cavity at some temperature above absolute zero, will the inertial and/or gravitational mass be equal to the mass...

A 17.0 kg box slides 4.0 m down the frictionless ramp shown in the figure, then collides with a spring whose spring constant is 190 N/m. Picture: http://session.masteringphysics.com/problemAsset/1000077659/2/knight_Figure_10_69.jpg We also know: a) What is the maximum compression of...

Homework Statement A box with a height L, and a cross sectional Area A is floating between two fluids of densities p1 and p2. Determine the mass of the box using ho, h1, h2, p1, p2, and A. Homework Equations F= pVg The Attempt at a Solution In the file attached I drew my free...

Homework Statement The experiment we did was pretty basic, it was a copper box with five different metal rods (unlagged and of equal lengths and diameter) welded onto the bottom, on the bottom of each were pins stuck with petroleum jelly. Hot water was then added to the box and the order at...

Homework Statement Mathematically, the Azimuthal equation is the same differential equation as the one for a particle in a box. But \Phi(\phi) for m_l = 0 , is a constant and is allowed, whereas such a constant wave function is not allowed for a particle in a box. What physics accounts for...

Homework Statement It can be shown that the allowed energies of a particle of mass m in a two dimensional square box of side L are E =h2(n2+m2)/8mL2 The energy depends on two quantum numbers, n and m, both of which must have an integer value 1, 2, 3... What is the minumum energy for a...

Homework Statement Chocolate Box Company is going to make open-topped boxes out of 5 × 14-inch rectangles of cardboard by cutting squares out of the corners and folding up the sides. What is the largest volume box it can make this way? (Round your answer to the nearest tenth.)...

Homework Statement If there were three boxes, one box is made of apples, the other is made of organes, and the last is made of organes and apples. You are able to open only one box without looking in, and you are able to look at only one fruit inside the box. By looking at the fruit, how can...

Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/d77fab7d-ece6-4c9c-be65-bf41f94770fd Homework Equations I got the right answers doing the work shown, but I don't understand the logic of how I solved question 4. The Attempt at a Solution

Homework Statement A mass m is resting at equilibrium suspended from a vertical spring of natural length L and spring constant K inside a box. The box begins accelerating upward with acceleration a. How much closer does the equilibrium position of the mass move to the bottom of the box...

Iam trying to work out question related to sequare box, my question is what the flux general equation for the sequare box? I work it out and found it is flux=Acos(pi*x/a)cos(pi*y/a)cos(pi*z/a) where a is side lenght, am i right

I have a motor driving a gearbox. I had DE bearing of the gearbox replaced recently as pitting in the inner race was found. Before re coupling the two units, I had the motor vibration checked and found to have satisfactory vibration levels in horizontal, vertical and axial directions. After the...

What if I am enclosed in a big box which initially has some air. It starts moving at a uniform speed of xKmph. Now suddenly , suppose the box becomes a vacuum. and I jump at the same instant. WHat happens? Will I land at the same place wrt to the box or will I smash the back? Now what about...

Say we have a small box with two physically identical bosons in it. Is it true that if I partition the box in two equal parts, it's more likely (2/3 chance) I'll have both particles at the same side? (Note: classicaly there's "only" a 50% chance of them being together)

Homework Statement Consider a cubic microwave cavity one foot on a side. Call this length a for purposes of your calculation. Look for the lowest fre- quency a wave trapped in the cavity can have. How many different modes are there which have this frequency? Assume the surfaces of the cavity...

I am trying to work out the wavefunctions for a particle in a box between -a/2 and a/2.I have already gone through the solution for a box between 0 and a and got the solution \sqrt{\frac{2}{a}}sin(\frac{n\pi x}{a} )So I can see that for -a/2 to a/2 I have...

Hi, I have a elec generating unit. The shaft has a rpm of 15000. Need to reduce to 250-300rpm i.e. bring it down to generating elec at 50Hz. Could somebody suggest which gearbox is suitable for this application to reduce from high to low rpm. Also suggest which type of coupling has to be used...

Homework Statement In Figure 7-47a, a 1.7 N force is applied to a 5.6 kg block at a downward angle θ = 49° as the block moves rightward through 1.4 m across a frictionless floor. Find the speed vf of the block at the end of that distance if the block's initial velocity is (a) 0 and (b) 1.3...

Homework Statement I have a test in my physics class on tuesday, and as a study guide, our professor gave us a sample test and the solutions. I worked through most of it, except for this one question. I don't understand his method to solving it, I was hoping you guys had a solution. I have...

Homework Statement A 30.0 kg packing case is initially at rest on the floor of a 1500 kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30 and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling...

I have a problem: Let V0(x) denote the potential corresponding to the innite square well (`box') extending from x = 0 to x = a . Let us replace it by the potential V (x) = 0 ; |x| \leq a/2 \infty; |x| \geq a/2 i want to find the solutions of the Schrodinger equation associated...

Homework Statement A plane flying 125 m/s horizontally drops an amunition box. The box falls for 18.6 s before touching down on the ground. a) what height was dropped for the box. b)what is verticle velocity when it hits ground. c)how fast is traveling horizontally when hit ground...

Help Please. :) Homework Statement A 20 KG box is dragged across a level floor with a force of 100 N. The force is applied at an angle of 40 degrees above the horizontal. If the coefficient of kinetic friction is .32, what is the acceleration of the box? Homework Equations ...Sorry...

Homework Statement a box of mass 5.0 kg is accelerated from rest across a floor at a rate of 2.0m/s^2 for 7.0s. find the net work done on the box. Homework Equations f = ma w= fdcostheta The Attempt at a Solution f = ma f=10 w = fdcostheta w=10d w=10*v*t w=10*v*7...

Homework Statement The function V(x) = x(14-2x)(15-x) 0<x<7 models the volume of a box Find the extreme values of V and tell whether these represent the smallest and largest volumes or only the smallest or only the largest volumes Homework Equations The Attempt at a Solution...

Homework Statement Consider a particle-in-a-box problem, involving a particle of mass m subject to a potential: V(x) = +∞ for X≤0 V(x) = 0 for 0<X<L V(x) = +∞ for X≥L |ϕn> are the eigenstates of the Hamiltonian H with the corresponding eigenvalues: En = (n^2)*(hbar^2)*(Pi^2) / 2mL^2...

I should know how to do this, but I've been getting a bit confused. Can you solve the particle in a box problem considering that the particle is a massless photon? I'm not so sure on how to write the Hamiltonian correctly for this problem. EDIT: Ok, to add some information, I'm actually looking...

Homework Statement A 38.7g box slides down an incline of height 12.5m. As it slides, air resistance does -3.71J of work. Find the speed at which it reaches the bottom of the incline. Homework Equations E kinetic at bottom = E potential at top - Work air resistance 1/2 mv2 - 1/2...

Hi, I've been thinking about the following: In an infinitely deep box a particle's energy operator can be written as E = p^2/2m, and the momentum operator as p = -i hbar dx. (particle moves in x direction) I can see that the commutator of E and p is 0, so the operators commute, and should...

Consider a box that is placed on different surfaces. a) In which situation (s) is there no force acting on the box? b) In which situation (s) is there a static friction force acting on the box? c) In which situation (s) is there a kinetic friction...

Homework Statement A particle of mass m is located in a box of length L and found to be in its ground state A) what is the probability of finding the particle between x=0 and x=L/4 B) What is the expectation value for the position of the particle? C)What is the expectation value <x^2>...

Homework Statement A ruby laser emits light of wavelength 694.3 nm. If this light is due to the transition from n=2 to n=1 state of the electron in a box, what is the width of the box? Homework Equations K=2pi/Lambda kL=npi The Attempt at a Solution Thinkin about the problem, i...

Suppose I have N ideal particles in an enclosure, be it a ball or a cube or some other form. The particles shall bounce off the walls of the enclosure and against each other without losing speed. The velocity of each particle i shall be such that it fullfills |v_i|=\rho, where \rho is constant...

So I'm working on a problem where you have 100 argon atoms in a box that obey the Lennard Jones potential. We're using the Verlet method to calculate the position of each particle at the next time step. The issue I'm having has to do with our boundary conditions. We assume that atoms are on a...

when you pull a box at an angle is it accelerating in the y direction? I would think it is since there is now an unbalanced force in the y direction.

Hello i have a problem with a laplace equation in a box, because the problem says that in the six face the tempeture is constant and given by the function f(x,y). and the other faces the temperature its zero. My teacher says that i must express the f(x,y) as a Fourier series, but i can't...

Homework Statement Write a General Formula solving for F to hold a box still on a ramp with friction. there is no numbers in this, only variablesHomework Equations F=ma F=force m=mass a=acceleration θ=angle μs=static friction g=gravity The Attempt at a Solution i drew a free body...

Homework Statement A stockroom worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.50m/s. The coefficient of kinetic friction between the box and the surface is .20. What horizontal force must the worker apply to maintain the motion? Homework Equations...