What is Box: Definition and 1000 Discussions

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. heartshapedbox

    Minimum force to make box slide down slope

    Homework Statement If m=5.0kg, φ=30◦ and μs =0.87, what is the minimum force needed to make the box slide down the slope? [/B] Homework Equations force of status friction is less than or equal to the normal force multiplied by the coefficient of static friction F,normal=mgcosφ The image...
  2. J

    A Shocker: PR Box is logically inconsistent

    If correct, Uzan refutes Popescu and Rohrlich. To me this seems like a big deal. Super-Quantum, Non-Signaling Correlations Cannot Exist Pierre Uzan http://arxiv.org/abs/1602.01135 Comments?
  3. F

    Can MRI Detect a Light Bulb Inside a Closed Box?

    I put a light bulb inside a box and make it glow, is there a way to know where the light bulb is if the box is closed and not transparent
  4. D

    Box attached to end of a string, what is the max velocity?

    Homework Statement a 0.60 kg mass is attached to one end of a 1.7 m string. The string will break if its tension exceeds 60 N. The mass is whirled in a horizontal circle on a frictionless tabletop, such that the other end of the string remains fixed at the axis of rotation. What is the maximum...
  5. x2017

    At What Angle Will This Box Begin to Slide?

    Homework Statement Homework Equations ΣFx=max The Attempt at a Solution I drew a free body diagram for the box and set up the equation to solve for θ, but I'm not sure how to do it without μ
  6. Einj

    Green's function in elliptic box

    Hello everyone! Does anyone know if there is a know expression for the Green's function for Poisson's equation that vanishes on an ellipse in 2 dimensions? I'm essentially looking for a solution to: $$ \nabla^2G(\vec x-\vec x_0)=\delta^2(\vec x-\vec x_0) $$ in 2 dimensions where $$G(\vec x-\vec...
  7. Hyo X

    KT (energy) vs Blackbody Radiation for molecule in a box

    I'm trying to understand the meaning of kT (energy) in molecular systems, how to define the temperature of an individual molecule, and how a molecule receives thermal energy or dissipates thermal energy. Here is my 'gendanken': One molecule is floating in a box, in vacuum. The temperature of...
  8. N

    How Many Plain Chocolates with Soft-Centers Are in the Kiddimix Box?

    Homework Statement A box of kiddimix contains 20 chocolates of which 8 are plain chocolates and 12 are milk chocolates. If 16 of the 20 have soft-centres, what can you say about how many plain chocolates there are with soft-centres? Homework Equations You can say there are 8/20 plain...
  9. S

    Energy of two fermions in a three-dimensional box

    Homework Statement Two particles of mass m are placed in a rectangular box with sides a>b>c (note 3D-box). The particles interact with each other with a potential V=A\delta(\mathbf{r}_1-\mathbf{r}_2) and are in their ground state (1s). Use first order perturbation theory to find the systems...
  10. F

    Box structure tracing experment

    I want to do an experiment where I follow the particle in all trajectory until it hits the wall of the box, then I want to draw out this box's structure based on the particle collision. One thing would be that the particle does not need to go in all trajectory, but I would like to know how to...
  11. W

    How much work does a crane and gravity do on a large box?

    Homework Statement [/B]Homework Equations E(p)=mgh W = Fs 3. The Attempt at a Solution The book says the crane does mgh amount of work, while gravity does -mgh. What I don't understand is, for the box to be lifted up, doesn't string tension force have to be bigger than gravity - or else it...
  12. 9

    Finding work done by friction on a box

    1. A box of mass m = 59.0 kg (initially at rest) is pushed a distance d = 83.0 m across a rough warehouse floor by an applied force of FA = 204 N directed at an angle of 30.0° below the horizontal. The coefficient of kinetic friction between the floor and the box is 0.100. Determine the...
  13. Tibriel

    A person and a box of equal mass are on a pulley with v=0....

    Homework Statement person and a box of equal masses are hanging off of the same pulley. The rope is considered massless. The person and the box are separate from each other. (The person is NOT standing on the box.) Homework Equations How far does the box move if the person starts climbing...
  14. M

    Quantum 1D box obtain an expression for the normalization constant

    Homework Statement An electron in a one-dimensional box with walls at x =(o,a) is in the quantum state psi = A o<x<a/2 psi = -A a/2<x<a A) obtain an expression for the normalization constant, A. B) What is the lowest energy of the electron that will be measured in this state...
  15. N

    Allowable energies for a Particle in a box

    Hi, I am wondering about additional solutions to the particle in a box problem. In the one dimension the wave functions allowed all make sense with nodes pinned to an infinite potential barrier at either end and then divided into node increments related to the length of the box. However, in 2...
  16. D

    Momentum eigenstates - particle in a box

    Hi. I am just starting to self-study QFT. Have been looking at the non-relativistic case of particles in a box. Have come across creation operators in the occupation number representation which create a particle in specific momentum state. But I thought in a rigid box there are no momentum...
  17. H

    Maximum speed of a box compressing a spring on an inclined p

    Homework Statement A box of mass m = 40kg is released from rest at thte top of a frictionless ramp. The ramp makes an angle theta = 45 degrees to the horizontal. After sliding fom the rigin a distance d = 2.00 m down the ramp, the box strikes a spring of force constant k = 500 N/m. The box...
  18. MattRC

    How Is the Friction Force on the Box Calculated?

    Homework Statement At a construction site, a 62.0 kg bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 80.0 kgbox on a horizontal roof (see the figure (Figure 1) ). The cable pulls horizontally on the box, and a 50.0 kg...
  19. P

    Box Pulled on Rough Horizontal Surface - Frictional Force

    Homework Statement A 100N box is initially at rest on a rough horizontal surface. The coefficient of static friction between the box and the surface is 0.6 and the coefficient of kinetic friction is 0.4. A constant 35N force is aplied to the box horizontally. Identify from choices (a) - (e)...
  20. E

    Find force box exerts on other box up incline

    Homework Statement A force F pushes two boxes, box 1 and box 2 up an inclined plane of 30 degrees. If F=25 N and box 1 is 2 kg and box 2 is 3 kg, what is the force exerted on the 2 kg box by the 3 kg box. Assume no friction. Homework Equations F=ma. The Attempt at a Solution Since the...
  21. P

    Number of Particles in Left Half of a Confined Box with Varying Energies

    Homework Statement 1000 neutral spinless particles are confined in a one-dimensional box of length 100 nm. At a given instant of time, if 100 of these particles have energy 4ε0 and the remaining 900 have energy 225ε0, then the number of particles in the left half of the box will be...
  22. P

    Energy eigenstates of a particle in a one dimensional box.

    Homework Statement A One dimensional box contains a particle whose ground state energy is ε. It is observed that a small disturbance causes the particle to emit a photon of energy hν=8ε, after which it is stable. Just before emission a possible state of the particle in terms of energy...
  23. J

    Does a rigid box of gas cool over cosmological timescales?

    According to standard cosmology theory the physical momentum p of both massive and massless particles decay like: $$p \propto \frac{1}{a(t)}$$ where a(t) is the scale factor as function of cosmological time t (for a derivation see page 12 in the following lecture notes...
  24. Sace Ver

    Calculate the coefficient of kinetic friction for a sliding box

    Homework Statement An electric motor is used to pull a 125 kg box across a floor using a long cable. The tension in the cable is 350N and the box accelerates at 1.2m/s2 (forward) for 5.0s. The cable breaks and the box slows down and stops. Calculating the coefficient of kinetic force? Given...
  25. H

    How Does Weight Affect Speed of a Soap Box Car?

    Homework Statement I was wondering about how the placement of weight affects Soap Box Cars. I have been racing them for 5 years now, and I cannot find any information. I was wondering if there was a formula to find the relationship between speed and weight, and how to solve it. For instance, if...
  26. P

    Gear box design against specified engine specifications

    Dear all,i have recently been provided a task of designing a basic gear box for a vehicle having following engine specifications: 127cc, max torque: 7.8N-m Max. RPM: 3200 How do I proceed for this? Please guide me what all additional information is required for this calculation and what all do...
  27. D

    How does friction affect the acceleration of a box being pulled by a rope?

    Homework Statement A box of m= 25 kg is pulled by a rope with a force of tension, F = 40 N inclined at an angle of 30o with the horizontal, there is no friction between the box and the ground. b) Determine the acceleration of the box. c) Write the equation to find the acceleration of the...
  28. P

    Proving volume of box using cross and dot product

    Homework Statement The diagram shows a box with parallel faces. Two of the faces are trapezoids and four of the faces are rectangles. The vectors A, B, and C lie along the edges as shown, and their magnitudes are the lengths of the edges. Define the necessary additional symbols and prove...
  29. K

    An accelerating conveyor drags a box

    Homework Statement The velocity of a conveyor is V=30+0.1t2. a box of mass m=3[kg] falls from zero height at t=0. the kinetic coefficient of friction is μk=0.4 and the static is μs=0.5. 1) At which times the friction is kinetic and at which static 2) What's the box's velocity in the different...
  30. chimath35

    Other financial aid box graduate app

    I am applying for a PhD program in statistics and I want a full assistantship. Should I check the box to apply for additional financial aid or will that affect an assistantship chance? Thanks.
  31. G

    Uncertainty principle if position is restricted

    Hi. Assume we have a large number of identical boxes of some finite length ##l## and with infinite potential walls. Let's prepare them all in the same momentum eigenstate. Since for eigenstates ##\Delta p=0##, by the uncertainty principle ##\Delta x## should go to infinity. However, since the...
  32. Kostas Tzim

    Strange problem -- Chrome Browser Error Dialog Box

    I know its written in greek but i think its a common problem...any ideas? i think that's why the "build 7061" geniunity problem appears. :(
  33. T

    Calculate maximum weight box can hold

    hi, This is probably very simple issue, but i am not an engineer nor have an understanding of basic physic... I need to calculate if the tape used to connect (sealed) to ends of the cardboard box will withstand the weight of the product i put inside it. I have a tape properties (tensile strength...
  34. D

    Heat Loss Through a Box with a hole in it

    This is mainly just a theoretical question: say you have a rectangular box made of styrofoam (one of those ice cooler things) and it is levitating in air at room temperature conditions. It also has one hole at the top of the container so that heat can get out of it. Inside the box is a lightbulb...
  35. fricke

    Particle in a box with the finite depth

    For particle in a box with the finite depth, is it traveling wave? or standing wave? I am confused with its ability to pass through the potential walls that is classically forbidden area which makes me think it is traveling wave. But for particle in a box with infinite potential, I understand...
  36. K

    Box Pushed Up an Incline Ramp: Basic Newton's Law Questions

    Homework Statement A 90 kg box is pushed by a horizontal force F at constant speed up a ramp inclined at 28°, as shown. Determine the magnitude of the applied force. when the ramp is frictionless. when the coefficient of kinetic friction is 0.18 Homework Equations F=mg FN=mg μ= Fk/FN The...
  37. nmsurobert

    Charged ball exiting a box....

    Homework Statement A small ball has mass 3.4x10^-8 kg and charge of 2.0x10^-5 C. It enters a box with initial speed 1.2x10^4 m/s. The point where the charge leaves the box is at a voltage 350kV higher than the entry point. Find the speed of the ball as it leaves the box. [/B]Homework Equations...
  38. Joydeep Munshi

    Particle in a Box: Degeneracy Explained

    Hi, in case of a particle inside a box (infinite square well), can degeneracy occur for different energy eigen states? please explain...
  39. B

    Heat transfer in a large steel box

    If I have a large steel box that is 27ft x 8ft x 8ft and has 7 in thick walls with 4 non-insulated windows each 1ft by 1ft, where does heat escape from inside the box, is it the windows and the walls? So if the inside temperature needs to be 72 F and the outside air is 0 F how much heat would...
  40. L

    A Match Box.... differentiation question

    Homework Statement a match box consists of an outer cover, open at both ends, into which slides a rectangular box without a top. The length of the box is one and a half times its breadth, the thickness of the material is negligible, and the volume of the box is 25cm^3 . If the breadth of the...
  41. F

    Increase temperature of liquid in a box without heat convection or conduction

    hello I have a liquid or gas inside a metallic box (eg. stainless steel 5mm thick) how can I increase its temperature without heat convection or conduction?
  42. G

    Does AC current pass through perfectly shielded box?

    Hello. I've recently have a lot of question of building Faraday cage for our high voltage gas discharge lab. I think this question is a kind of fundamental question for such a job. Let's say I would make perfect Faraday cage with perfect shielding or have metal plate of infinity transverse...
  43. T

    What Is the Shortest Path an Ant Can Take Across a Cube?

    Homework Statement An ant which can crawl along the walls of a cubical box of side 1 m can travel from one edge to the diagonally opposite edge by traveling what shortest distance? The options are : a) 2m b)√2 +1 m c) √3 m d) √5 Homework EquationsThe Attempt at a Solution I drew a...
  44. R

    How long does the box take to reach the wall?

    Homework Statement A stationary 10 g box is pushed with a force 20 Newtons across a level floor. How long will it take the box to reach a wall 10 meters away? Homework Equations Applied force - Friction Force? The Attempt at a Solution I am unsure how to attempt this. Do I need to know the...
  45. J-dizzal

    Friction of a sliding box on a slope

    Homework Statement A loaded penguin sled weighing 75 N rests on a plane inclined at angle θ = 21° to the horizontal (see the figure). Between the sled and the plane, the coefficient of static friction is 0.30, and the coefficient of kinetic friction is 0.18. (a) What is the minimum magnitude of...
  46. C

    [Semiclassical physics] 1D box trace formula

    Hey there. While studying the Single-particle Level Density, I encountered the example in the image below, referring to the One-dimensional Box problem. However, I do not understand what is it that he call's F(E), neither how does one go from that, to the density of states in Equation (3.64)...
  47. P

    Why does a radio still work inside a metal box?

    I've put a small battery powered commercial radio inside a Quality Street tin. The tin is all metal with rolled joints and the lid is a tight fit. I'd be willing to bet that there are no holes greater than 0.1mm around the lid's closure. Why does the radio work when receiving an AM station (1...
  48. S

    Calculate Eigen Function of 3D Potential Box w/ Doubled X Side

    Suppose we have a 3D potential box having different length. Now suddenly we double the length of a particular side(Say along X direction) of the box. Can we calculate what will be the eigen function of the Hamiltonian. Is there Time Independent S.E. holds?
  49. S

    How far will a box slide with given initial velocity, friction, and mass?

    Homework Statement How far will a box slide if its initial velocity is 1.5 m/s, kinetic friction is 0.15 and the object is 30 kg Homework Equations a= (kinetic friction)(acceleration due to gravity) and V(final)^2 - V(initial)^2 = 2(a)(D) The Attempt at a Solution a= 0.15 x 9.81 m/s^2 =...
  50. physicsisgreat

    Decelerating box on a truck and work

    Homework Statement A truck is moving at constant velocity v0 with a box of mass m on it. Suddenly it starts decelerating until its velocity becomes zero. Between the box and the truck the is a force of friction and the deceleration of the truck is sufficiently slow to allow the box not to start...
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