Box Definition and 1000 Threads

A box (plural: boxes) is a type of container or rectangular prism used for the storage or transportation of its contents. The size of a box may vary, from the very smallest (such as a matchbox) to the size of a large appliance, and can be used for a variety of purposes ranging from the functional to the decorative.
Boxes may be made of a variety of typically durable materials, such as wood and metal, though common non-durable materials include corrugated fiberboard and paperboard. Corrugated metal boxes are commonly used as shipping containers. Boxes made of cardboard can be degraded and therefore are not bad for the environment.
Boxes are typically rectangular in shape with a rectangular cross-section, though a box may also have a square, elongated, circular or oval appearance; boxes may also feature sloped or domed top surfaces, or vertical edges, and are not consistently made in a square fashion. Square and rectangular boxes are still much more common than its other various shapes that it could come in.
Boxes may be closed and shut with flaps, doors, or a separate lid. They can be secured shut with adhesives, tapes, or more decorative or elaborately functional mechanisms, such as a catch, clasp or lock.

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  1. D

    What Is the Probability of Finding a Quantum Particle in a Section of a 1D Box?

    Homework Statement A quantum particle is free to move in a infinite 1d potential well of length L excited on the second excited state n=3.What is the probability to locate the particle between 0 and L/3. Homework Equations ∫ψ^2=1 ψ=sqrt(2/L)sin(n∏x/L) The Attempt at a Solution...
  2. B

    Has path of a standing wave confined in a metal box been measured and described?

    Has path of a standing wave confined inside a metal box been measured and described? I'm thinking path is circular, or, oscillates/bounces back and forth like a pendulum. I'm thinking of a standing wave moving inside a metal rectangular box. Has the path of a standing wave inside a...
  3. F

    Find the speed with which the box hits the ground.

    Homework Statement A box whose mass is 4kg is at rest on the floor. It is then lifted to a height of 2m by a constant a constant force F and then released. At this point the box has upward velocity of 5m/s. Do not use Newton's laws of motion to solve this problem. A. Find magnitude of the...
  4. T

    Finding Constant Force to Pull Board from Mass 1 Box

    Homework Statement A small box of mass 1 is sitting on a board of mass 2 and length L . The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is Us . The coefficient of kinetic friction between the board and the box is, as usual...
  5. I

    Calculating acceleration of a box from force?

    Homework Statement A box rests on top of a flat bed truck. The box has a mass of m = 15.0 kg. The coefficient of static friction between the box and truck is μs = 0.8 and the coefficient of kinetic friction between the box and truck is μk = 0.63. I had previously calculated in an earlier...
  6. C

    What Is the Average Power Delivered in Lifting a Box with Constant Acceleration?

    Homework Statement A 7-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. If the box is lifted, at constant acceleration, from rest on the floor to a height of 1.5 m above the floor in 0.42 s, what...
  7. T

    What is the least amount of force needed to pull a board out from under a box?

    Homework Statement A small box of mass is sitting on a board of mass and length L . The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is . The coefficient of kinetic friction between the board and the box is, as usual, less...
  8. M

    Calculating expansion coefficients for particle in 1-D box

    While reviewing for my midterm I came across an old problem that asked me to find the expansion coefficient for n=1 given an expression for the superposition wavefunction. I also know the expressions for the individual eigenstates because it is simply considering a particle in a 1-D box. I am...
  9. B

    Rigid Box and 3D Schrodinger equation

    Homework Statement An electron is confined within a three-dimentional cubic region the size of an atom where L = 200 pm. a) write a wave equation for the electron b) wirte a general wave function for the possbile states of the electorn. List any quantum numbers and their possible values...
  10. J

    Finding the angle at which a box starts to slide down a ramp

    Homework Statement A box of mass   4.0 kg is placed at rest on a ramp. The coefficients of static and kinetic friction are $&  0.35 and $%  0.22, respectively. As the ramp is slowly raised from a horizontal orientation, find the critical angle above which the box starts to slide...
  11. M

    Finding acceleration of a box with two forces acting on it

    Homework Statement Two people pull on a 25kg box that is resting on smooth ice. What is the acceleration of the box? Assume friction is negligible. the img is important bc of the description of the two forces acting on the box. try and ignore my frustrated chicken scratch. t1=50 t2=100...
  12. J

    Box sliding on 35 degree grade

    A box slides down a frictionless plane that makes an angle of 35 degrees with the horizontal. A horizontal force of half the box's weight presses the box against the plane. What is the box's acceleration? I'm confused as to what kind of effect would a horizontal force have on an object...
  13. 1

    Free body diagram of man in a box

    Homework Statement A 60 kg man stands in a 30 kg box on a light weighing machine. If the box is kept at rest due to force applied by the man by the rope , what is the weight shown by the weighing machine? Homework Equations The Attempt at a Solution .answer given in book is 15...
  14. K

    Moving a box with a force that is less than gravity

    Homework Statement The object is a box with a given mass m. Our person has the choice between pushing the box with a horizontal force, or pulling the box with a wire with an angle of θ=30o. The magnitude of Fo is the force vector he affects the box with in both cases. Is it possible (If you...
  15. R

    Balls in a box shaking experiment

    A box contains V balls of which N_{g} are green, N_{r} are red and V-N_{g}-N_{r}=N_{b} are blue. Now somebody shakes the box vigorously, brings it to rest and then observes the arrangement of the balls in the box. Suppose this is repeated many times so that probabilities of different ball...
  16. K

    Moving a box with greatest acceleration

    Homework Statement The object is a box with a given mass m. Our person has the choice between pushing the box with a horizontal force, or pulling the box with a wire with an angle of θ=30o. The magnitude of Fo is the force vector he affects the box with in both cases. Should the box be...
  17. B

    Horizontal Force Required to move a box up a ramp

    Homework Statement A block with a mass of m is initially moving up the incline and is increasing speed with an acceleration of a. The applied force F is horizontal. The coefficients of friction between between the block and incline are μs=S and μk=K. The angle of the incline is θ. What is the...
  18. L

    Three forces on a box in different directions what is the acceleration

    Homework Statement Force A 250 degrees @ 200 N Force B 150 degrees @ 300 N Force C 50 degrees @ 400 N mass = 40kg mew = .14 what is acceleration Homework Equations Fa^2 = Fy net^2 x Fx net^2 Fn = Fg Ff = Fn x mew Fnet = Fa - Ff F= ma The Attempt at a Solution Fax=Cos...
  19. N

    Need help in the physic HW question This is not the box question

    Homework Statement The handle of a floor mop makes an angle θ = 28.6o with the horizontal. Assume the handle is massless, and the mop has mass M = 1.4 kg. The coefficient of kinetic friction between the mop and the floor is μk = 0.386. Find F, the magnitude of the force, exerted downward...
  20. X

    Quantum Mechanics: Particle in a Box Periodic BC's

    Homework Statement The question says to solve the Schrodinger equation for a particle in a box with periodic conditions and then it gives. ψ(0)=ψ(a) The Attempt at a Solution I used the above BC and I also did it as its derivative. (It wasn't stated but I assumed it was implied. I had no...
  21. U

    Einstein's Box Change in Centre of Mass

    Homework Statement The question is posted here: http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html I'm not too convinced by their explanation of 'compensation of shift in centre of mass' The Attempt at a Solution What I understand is this: 1)Box of mass M moves distance d...
  22. M

    Calculating Work Done on a Box Moving Up a Ramp

    Homework Statement A box of weight 200N is pushed so that it moves at a steady speed alog a ramp, through a height of 1.5m. The ramp makes an angle of 30° with the ground. The frictional force on the box is 150N while the box is moving. What is the work doe by the person? Homework...
  23. T

    Dynamic FBD - Man and box sliding on an incline

    Homework Statement http://img59.imageshack.us/img59/493/capturemml.png The Attempt at a Solution Here is my attempt. I assumed that both the man and the box would slide down the incline. (The box is the left diagram and the man is on the right)...
  24. A

    Electron in a box. Finding the length of the box. (infinite well)

    Homework Statement An electron is confined in a one-dimensional box (an infinite well). Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box? (h = 6.626 × 10-34 J · s, mass of electron = 9.11 × 10-31 kg) Homework Equations \Delta...
  25. D

    What is the formula for the width of the potential box?

    Homework Statement An excited electron (quantum number =4) in a 1D potential box de-excites to the ground state and emit a photon. This photon subsequently becomes absorbed by an electron in a hydrogen atom. The electron in the hydrogen atom becomes excited to an excited state with quantum...
  26. D

    Identical fermions in a box - degenerate states

    The ground state for two identical fermions in a box (in 1D) is given by: \psi (x_{1},x_{2})_{12} = \frac{\sqrt{2}}{a}[sin(\pi x_{1}/a)sin(2\pi x_{2}/a) - sin(2\pi x_{1}/a)sin(\pi x_{2}/a)] The book I'm reading though says that this state is non degenerate, and that the next excited state...
  27. M

    Writing Volume as a Function of Height for an Open Box

    Homework Statement An open box of maximum volume is to be made from a square piece of material 24 centimeters on a side (24-2x) by cutting equal squares from the corners and turning up the sides. The table shows the volumes V (in cubic centimeters) of the box for various heights, x (in...
  28. S

    Thought Expirement: Light In a Mirrored box

    A theoretically perfect mirror with no gaps cracks, (no absorbing surfaces), so small that only a single photon could tightly fit inside Is it stopped? If so let's get our scales ;)
  29. C

    Engineering Black box Conumdrum: CL or LC order in a RLC circuit

    Hey everyone. Since it is nearest the end of the summer semester for the Lab component of my classes, Our professor is having do the 'Black Box' project. From the information he gave us, there are three component in a L-configuration, an inductor, capacitor, and a resistor. The Box itself had...
  30. S

    Box on an incline with friction, min and max forces involved

    μSomeone is pushing a packing case of mass 30 kg up an inclined slope of angle 11.3deg. as shown in the diagram below. The coefficient of kinetic friction between the case and the slope is µk = 0.100 and the coefficient of static friction is µ = 0.200. 1. The minimum force the person must...
  31. S

    Ball and Box Collision: Finding Final Velocity

    Homework Statement A ball with mass 2.5 kg is moving in outer space with a velocity of 6.0 m/s horizontally, and a box of mass 4.5 kg is moving with a velocity of 4.0 m/s at a angle of 120 degrees from the horizontal. the two collide and stick together. Find the final velocity of the pair...
  32. J

    Coefficent of friction for a box moving at cosntant speed

    Homework Statement A horizontal force fo 190N is needed to pull a 70kg box across a horizontal floor at a constant speed. What is the coefficent of friction between the box and the floor? Homework Equations Fnet = ma The Attempt at a Solution My setup is F - F_f = m*a But I...
  33. N

    Would the delay cause the box to move?

    Hi, a friend and I were talking and a question came up about a delayed force. It goes like this: This is hypothetical obviously. You have the sun and the Earth pulling on each other because of gravity. (The force of the pull between them does not matter, it just has to be equal.) The sun and...
  34. R

    Java How to create a box around text in Java. Inside windows cmd.exe

    How can I make a box around text in Java which will appear in Windows cmd.exe? Only using System.out.print("X"); and System.out.println("X"); . It MUST be a solid box and not use symbols like - or _ . It can also use int X , double X, char X, String X, and boolean X. Please explain...
  35. Y

    What is the gear ratio and horsepower required for an ECAP machine gearbox?

    Our lab is looking at designing a new ECAP machine (Equal Channel Angular Pressing). It needs to be driven by an electric motor attached to a gearbox. From their modeling and data collected from their existing ECAP machine they are requesting the output shaft on the gearbox to have a 2,000,000...
  36. J

    Year 12: Cambridge Physics Problem (Doppler effect of light in a box)

    An evacuated cubical box of side a is constructed with perfectly reflecting interior surfaces; initially, it is dark inside. A small window is opened to allow light of frequency f to enter the container and is also closed again when the box contains N photons. Suggest what might happen if the...
  37. S

    Optimization box with maximum volume?

    Homework Statement A manufacturer wants to design a box having a square base and a surface area of 108m^2. What dimension will produce a box with maximum volume?Homework Equations a=x^2+4xy V=x^2y a=108m^2 The Attempt at a Solution
  38. A

    Is the de Broglie wavelenght incongruent with particle in a box calculation?

    Dear Physics Forum, I think I am confused in applying the correspondence principle in QM, using the particle in a box and de Broglie wavelength calculations for massive (macroscopic) objects. Why is the calculated energy of a massive object so small in the particle in a box E = h2/8mL2...
  39. A

    Making a box to always fall on the same side

    Say I have a cuboid box (eg 120 * 60 * 10cm (lbh)). Is there a way I can add non-uniform mass to it to force the center of gravity on a preferred point (eg making one half heavier than other) - and then when I drop it horizontally or vertically, it always touches the ground at same side (but may...
  40. S

    Harmonic motion of a box of mass

    (a) A box of mass m, attached to a spring, oscillates in simple harmonic motion on a frictionless surface as indicated in the figure below. Each time the box reaches the point of maximum displacement a child allows some sand to fall vertically into the box. This will gradually increase the mass...
  41. B

    Velocity of a box going up an inclined plane.

    Homework Statement A box is hurled up an incline plane of 20 degrees at 10m/second. There is no friction. What is the velocity after 3 seconds. I know gravity and the sin of 20 degrees has to be factored in. Homework Equations v=u+at. u is initial velocity, v is velocity after 3...
  42. Nono713

    Introductory quantum mechanics (particle in a box)

    Homework Statement The (normalized) wavefunction of the particle is defined as: \psi_n = \sqrt{\frac{2}{L}} \sin \left ({\frac{\pi n}{L} x} \right ) for 0 \leqslant x \leqslant L and \psi_n = 0 otherwise, where L is the length of the one-dimensional box and n is the particle's energy...
  43. A

    Should I Drain the Ice Box for Better Chilling?

    I've obtained an insulated plastic cooler box. I want to use this when sea fishing to store my catch and keep it chilled as cold as possible until I can get it home. I intend to load a quantity of ice cubes into the bottom of it and drop the caught fish on top of the ice. My question is - Should...
  44. P

    Identical spin 1/2 particles in a box.

    Homework Statement two identical particles of spin 1/2 that confined in a cubical box of side L. find the energy and wave function (non-interacting between particles) Homework Equations for a cubic boxby and reducing the Schrodinger equation: ψ(x,y,z)=√(8/L3 ) sin((nx πx)/L)sin((ny...
  45. P

    Spring-mass system in an excited box

    Homework Statement Well, I have this spring (stiffness k and free length l_{0}) mass ( m ) system in a box which has a width w such that l_{0}>w (i.e. the spring is compressed). The box is excited (given a prescribed position) by: u(t)=b\cdot sin({\omega}\cdot t). Determine the range of...
  46. N

    Building an AUTOMATIC MUSIC BOX - HELP

    Hello everyone, I am a music composer and total noob. So please excuse my lack of engineering knowledge. I am attempting to build a music box that can play without having to turn the gear's crankshaft manually. Here is a picture of the music box: I have been doing some research and think I...
  47. B

    Integrating a square box to find maximum volume

    Hi guys! I thought it was intergrationintegration, i think its differentiation. Im having problems trying to figure out where to start with this question: A rectangular tank with a square base x meters and height h meters is to be made from two different materials. Material for the...
  48. R

    Force of Spring and Potential Energy of Spring Pushing a Box

    Homework Statement A horizontal spring with spring constant 97.9 N/m is compressed 18.2 cm and used to launch a 2.96 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface...
  49. R

    Can a closed box in freefall reveal the curvature of space?

    Purpose of the "closed box" It's often stated that GR follows from the observation that an experimenter inside a closed box in freefall could not distinguish between the box being in that circumstance, and the box being in open space away from any gravitational field. In each case, objects...
  50. M

    Electron in box considering effects of gravity

    An electron is enclosed in a large rectangular box. Considering gravity, estimate the order of magnitude of the thickness of the layer that is occupied by the electron at the bottom of the box. I thought about this for a long time and I really have no idea how to proceed. Any thoughts?
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