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. E

    Project: RF Transmitter in a metal box

    I have a question on my Junior Design project: My project will be going into a metal enclosure, but contains an RF transmitter with PCB antenna to allow it to be controlled from a USB port on a laptop. Our current plan is to make a 1"x1" glass opening to allow the signal to get out (2.4GHz, so...
  2. A

    Solving a Physics Problem: Net Work Done on a Box

    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...
  3. J

    Finding Extreme Volumes of V(x): A Box Model

    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...
  4. D

    Probability of measuring specific energy of particle (in a box)

    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...
  5. A

    How can I apply quantum mechanics to describe a photon gas in a box?

    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...
  6. E

    Box slides down incline, air resistance does work. Find Velocity.

    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...
  7. M

    Particle in a box: commuting energy and momentum operators

    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...
  8. R

    Is there no force acting on the box?

    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...
  9. F

    Impule and Momentum. Second Collision of a box and spring

    Homework Statement a 10-kg block A is released from rest 2m above the 5kg plate P, which can slide freely along the smooth vertical guides BC and DE determine the velocity of the block and plate just after impact. the coefficient of restitution between the block and the plate is e=.75 also...
  10. T

    Probability of a Particle in a box location

    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>...
  11. T

    Calculating the width of the box for a particle in a box

    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...
  12. B

    Statistical behaviour of ideal particles in a closed box

    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...
  13. L

    Why Do Argon Atoms in a Toroidal Box Show Unusually Large Positional Values?

    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...
  14. K

    Total ground state energy of N fermions in a 3D box

    Hello everybody, I just have no idea how to start this problem so i was hoping you guys would point me in the right direction and then i'll be able to go on by myself the problem asks to show that the total ground state energy of N fermions in a three dimensional box is given by E total =...
  15. P

    Understanding Acceleration: Pulling a Box at an Angle

    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.
  16. J

    What is the Fourier series for a constant temperature in a box?

    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...
  17. K

    Solving for F to Hold a Box Still on a Ramp w/ Friction

    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...
  18. M

    Stockroom worker pushes a box homework problem

    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...
  19. T

    Solving Homework: Man Pushes 11.2 kg Box

    Homework Statement Man pushes a box that is 11.2 kg on a horizontal surface at a constant speed of 3.5 m/s2. Where μ is .20 a)What is the horizontal force rthat teh man must apply to maintain teh motion b)If the force of part a is removed, how far does the box slide before coming to rest...
  20. G

    Exploring the Physics of Newton's Third Law: Acceleration of a Box

    Homework Statement Newtons third law tells that if you push a box with 15N force, it pushes back on you with 15N force. How can you ever accelerate this box if it always pushes back with the same force you exert on it? explain briefly
  21. T

    Static Equilibrium/Torque-Calculating the force required to tip a box

    Static Equilibrium/Torque--Calculating the force required to tip a box Homework Statement A uniform crate with a mass of 13.2 kg rests on a floor with a coefficient of static friction equal to 0.536. The crate is a uniform cube with sides 1.21 m in length. (a) What horizontal force applied...
  22. T

    Probability of electron in a box problem

    Homework Statement Calculate the probability that an electron will be found (a) between x = 0.1 and 0.2 nm, (b) between 4.9 and 5.2 nm in a box of length L = 10 nm when its wavefunction is psi = (2/L)^1/2 sin(2*pi*x/L). Homework Equations As far as I know, only the normalization equation...
  23. J

    2 boxes stacked, force applied to bottom box

    2 boxes are stacked vertically, box A on top with box B below. Mass of box A is 15kg. Mass of box B is 30kg. There is friction between all surfaces; static coefficient of 0.40, and kinetic coefficient of 0.35. The blocks are stationary when the constant force F is applied to box B (bottom box)...
  24. D

    Box sliding down an inclined plane

    Homework Statement A box is placed on an inclined plane of angle \theta. There is no fiction between the box and the plane nor between the inclined plane and the floor. The mass of the box is m_1 and the mass of the inclined plane is m_2 . Find the acceleration of the box and that of...
  25. M

    Finding V for a 2D box using separation of variables.

    Homework Statement We have a 2-dimensional box with only one side at a potential V0. The other 3 sides are grounded. The box is a square with top and bottom at y=a/2 and –a/2 and sides at x=±a/2. Find V(x,y) (it should contain cos and sinh). Homework Equations The Attempt at a...
  26. C

    Box sliding down multiple ramps

    Hey all, I was wondering about a box that is sliding down what is basically a half pipe. There are 3 ramps, and I can get the correct sliding on the first ramp, but I can't figure out how to make it move to the next ramp. I am posting my physics code if anyone is interested...
  27. P

    Overcoming Friction Sliding Box.

    Homework Statement A 75 kg box slides down a 25 degree ramp with an acceleration of 3.60 m/s/s Find the coefficient of kinetic friction (I'll use "uk") between the box and the ramp. Find the acceleration for a 175 kg box. Homework Equations F=ma Fg= mXg (g=9.81 m/s/s in my...
  28. O

    What is The New velocity of the box?

    Homework Statement A 24 kg box is being pushed across the floor by a constant force ‹ 107, 0, 0 › N. The coefficient of kinetic friction for the table and box is 0.18. At t = 8.0 s the box is at location ‹ 11, 2, −4 › m, traveling with velocity ‹ 5, 0, 0 › m/s. What is its position and...
  29. V

    Particle in a box momentum uncertainty

    1. this is for a particle in a box (infinite potential well): For the wave functions calculate (as a function of n) \Deltax \Deltap \Deltax\Deltap Homework Equations h = h bar below u+n(x)=(1/\sqrt{a} )cos((n-1/2)(pi)x/a) u-n(x)=(1/sqrt{a})sin(n(pi)x/a) E-n=h2/(2m)(n(pi)/a)2...
  30. O

    Will an Applied Force of 5 N Move a 1 kg Box?

    Hello people, I just joined up and I have just started to learn Physics by myself. I had originally taken Physics in high school but even though I did not get good marks I really enjoyed the concepts. I am now 28 and have completed a Honours BA in Geography and a Masters in Education. I want to...
  31. A

    Solving the Problem of Unwanted Mains Supply Field in a Faraday Box

    Hello, I have constructed a Faraday box with alluminium sheets having holes on them. The problem is that the mains supply field is not canceled within this box. The box is about 50cmx50cm and hosts a number of electrodes and an electrical drive that moves these system of electrodes. I...
  32. G

    What is the output speed at 100 rpm arm rotation in an epicyclic gear box?

    Hi, Cant understand this at all, even modeled the set up with lego but still can't fathom it! I can't see how the arm can rotate with locking something. Cheers
  33. C

    Calculating Acceleration of a Box on a Frictionless Surface

    Homework Statement A box of mass 20.00kg placed on a frictionless surface is pulled by two horizontal forces in the plane of the floor, as shown below. Determine the following quantities. a) acceleration vector. b) magnitude of resultant acceleration and its angle with the x-axis...
  34. V

    Gearboxes for Increasing Speed: Types & Tips

    hello i want buy gearbox for increase the speed i know that worm gearbox cannot use for increase the speed..just for reduce speed what is the type of gearbox can i use for increasing the speed there is gearbox types - Bevel Gearbox - Helical Gearbox - Planetary Gearbox - Sequential Gearbox -...
  35. S

    Special relativity: rectangular box moving 0.5c

    Homework Statement A rectangular box at rest in S' has sides a'=2m, b'=2m, c'=4m. The side c' is parallel to z' axis of S'; the side b' forms an angle 45deg with x' axis of S'. S' moves with v=0.5c with respec to S, along its x axis. Find the volume of the box in S and S'. Homework...
  36. B

    What is the total probability of finding a particle in a one-dimensional box

    Hi, This is my first equation that I need to solve and both my textbook and professor have not shown me how to do it. I'm in chemistry and there isn't a prerequisite for calculus so I was wondering if I could be shown a way to solve this problem without doing calculus but if there isn't a way...
  37. G

    How Do You Calculate the Surface Area of an Open Box with a Square Base?

    Homework Statement Ok this is from a summer assignment that I had for calculus yet it's not calculus but it was graded by my calculus teacher so maybe there's something she knows that I don't from a calculus standpoint that allowed her to mark me wrong for this so here we go... Write a...
  38. e2m2a

    Effect of air flow on temperature inside box

    If I have a heat source on for a one hour period inside an adiabatically sealed box, such as a 10,000 watt light bulb turned on for an hour, and simultaneously I have a fan on that constantly circulates the air inside the box, would a temperature probe measure a lower temperature due to the...
  39. W

    Basic Quantum Physics - Particle(s) in a (3D) Box

    Homework Statement A system of 20 neutrons are confined in the region 0<x<3L 0<y<L 0<z<2L With L=10^{-15}m If each eigenstate can accept 2 neutrons (corresponding to the 2 possible spin states) what is the total kinetic energy of the system? Homework Equations I found the...
  40. K

    What Is the Probability of Finding an Electron at the Center of a Quantum Well?

    Hi, I have been given the following problem; If an electron is confined to a 1-D potential well of infinite barrier height and width L, the normalized wavefunction Psi(x) of the electron in the various quantized states, n, is given as Psin(x)=(2/L)0.5 sin(n pi x / L). For the n=2 state...
  41. E

    Solving a Black Box: 2 Components, Series or Parallel?

    Homework Statement 2 different types of components in a black box, which might be 2 of the following, resistor, capacitor or inductor. they can be in parallel or series. 2 tests: 1. DC voltage = 0.01 ohm 2. fixed 1V AC RMS to the input and f=10Hz, I=75mA f=100Hz, I=20.9mA...
  42. W

    What evidence do we have for the existence of electron clouds?

    Hello. I have recently been introduced to the concept of electrons as standing waves around the atomic nucleus. The explanation I read used the simulation of "a particle in a tube" to give a monodimensional interpretation of how the standing wave behaves. Within an atom, what serves as the...
  43. H

    How Does Friction Affect the Acceleration of a Truck Carrying a Heavy Crate?

    Homework Statement You and a friend have just loaded a 200 kg crate filled with priceless art objects into the back of a 2000 kg truck. As you press down on the accelerator, force F(surface on truck) propels the truck forward. To keep things simple, call this Ft. What is the maximum...
  44. C

    Steady Temp of a heater in a box (Thermodynamics)

    Hey all: I am taking a Thermodynamics course and we are studying work and heat through surfaces (i.e. conduction, convection, and radiation). I was given an assignment and I am having trouble arriving at the correct answer. I have scanned the question and the works I have so far. I hope...
  45. J

    Particle in 1D Box: What Happens When Wall Removed?

    A particle is moving in a 1D box with infinitely high walls. The potential is zero inside and infinite outside. What will happen if one of the walls is suddenly removed??
  46. J

    Maximizing Volume: Finding Optimal Dimensions for a Box with an Open Top

    Homework Statement A box with a square base is to have an open top. The area of the material in the box is 60 sr in. What are the dimensions when the volume is maximized? Homework Equations The Attempt at a Solution A=x2+4xy V=x2y x2+4xy=60 4xy=60-x2 y=(60-x2)/4x Where do...
  47. W

    Can a Stud Sensor Differentiate Between Raw and Hard-Boiled Eggs?

    Our design lecturer require us to come out with a black box which can differentiate between raw egg and hard-boiled egg. On the black box, there should be one inlet and two outlets (one for raw, the other for hard-boiled).Dimension constraints of the black box is 500mm x 500mm x 500mm. The power...
  48. L

    Why is the first term on the right-hand side of this equation transposed?

    From Box 3.3, p. 85: Since S^{\alpha}_{\phantom{\alpha}\beta\gamma} = S(\omega^\alpha, e_\beta, e_\gamma) and since S=S^{\alpha}_{\phantom{\alpha}\beta\gamma}e_\alpha\otimes\omega^\beta\otimes\omega^\gamma is it then true that S=S(\omega^\alpha, e_\beta...
  49. C

    Photons in a Box Contribute Weight

    It is said that if you add photons into a box and close it, the weight of the box will be increased. My question is: How? Photons are understood to be massless, which is what allows them to travel at c. But, when photons are absorbed by a material body, they do add mass to that body. Now...
  50. P

    What should you do in the Two-box Monty Hall problem?

    In the thread for my post of "The Boys Puzzle", D H, a PF Mentor, wisely mentions the Monte Hall problem as an example of the type of puzzle that people have difficulty dealing with. That is indeed the case. For example, here is a slight modification of that Monte Hall puzzle that has been...
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