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. 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 =...
  2. 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...
  3. K

    Find the force which makes the box jump

    Homework Statement What force one need to push the box with mass ##m_1## for the box with mass ##m_2## to jump when the force disappears? Homework Equations Newton's second law. The Attempt at a Solution System, when the force is applied: System, when the force disappears: ##F## is the...
  4. nsaspook

    What's the secret behind chip performance?

  5. gfd43tg

    Particle in a box in cartesian coordinates

    Homework Statement Homework EquationsThe Attempt at a Solution a) The schrödinger equation $$i \hbar \frac {\partial \Psi}{\partial t} = - \frac {\hbar^{2}}{2m} \nabla^{2} \psi + V \psi $$ For the case ##0 \le x,y,z \le a##, ##V = 0## $$i \hbar \frac {\partial \Psi}{\partial t} = - \frac...
  6. D

    MHB Math Behind Why a Box Tips Over When x > b/2

    I just want to know the correct mathematical workings of why the box will tip over when distance x of the normal force from the center line is b/2. what I know is when $\sum M$ about the point of application of the normal force is zero, the box will not tip over. so, mathematically...
  7. hideelo

    Density of states in 2 dimensional box

    I am trying to calculate the density of energy states in a two dimensional box. The way my professor did this is by first calculating the amount of states with their energy less than some energy e and taking its derivative with respect to e. In order to see how many energy states there are with...
  8. kreil

    Insights Visualizing the 2-D Particle in a Box - comments

    kreil submitted a new PF Insights post Visualizing the 2-D Particle in a Box Continue reading the Original PF Insights Post.
  9. copypacer

    Solve the Mystery of Force 2 on a 2.43 kg Box

    Homework Statement There are two forces on the 2.43 kg box in the overhead view of the figure but only one is shown. For F1 = 20.0 N, a = 11.4 m/s2, and θ = 33.0°, find the second force (a) in unit-vector notation and as (b) a magnitude and (c) a direction. (State the direction as a negative...
  10. Brendan Webb

    How to Solve a Basic Sliding Box Problem on a Frictionless Ramp?

    Hi 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. My attempt at a solution. I diagrammed the problem as in the file uploaded. To figure out the horizontal...
  11. Quarlep

    Ignorance about a particle in a box

    Lets suppose we have an object but we cannot tell anything about it.Energy,speed anything you can imagine.If there's no speed or energy,Is this means we can't tell object situation in physics Is that possible.Cause we have a object but we cannot describe the situation of it (I mean using...
  12. ChrisVer

    Dragging colored balls off box in succession

    Suppose you have a box with 10 balls, the 4 are red, the 5 are blue and the 1 is white. The probability of dragging each ball is 0.4~,~0.5~,~0.1 respectively. Now if I ask what is the probability of getting 3 balls in the order: red -> blue -> white, what is the right answer if balls are...
  13. S

    What are the forces acting on a sliding box?

    I was asked to draw a free body diagram to derive the equation tan θ = µs for the following situation: A box sliding down an inclined plane. My FBD has 3 forces - gravitational forces pointing downward (horizontally) <-- longest vector - normal force perpendicular to the box - frictional...
  14. Shinwasha

    Finding Magnetic Field from a Box

    Homework Statement [/B] A uniform magnetic field exists in a cubic volume of space with a 50-mm side length. If the magnetic energy stored in this volume is 19J , what is the magnetic field magnitude? (This is all the information I got. Been a bad week for since it just seem information for my...
  15. T

    How can you maximize the volume of a box made from a rectangular sheet?

    Suppose someone gives you a rectangular sheet of length a and width b (so b ≤ a). You make a topless box by cutting out a square with length x out of each corner and folding up the sides. How should you cut the sheet so as to maximize the volume of your box?
  16. J

    Mass of Box A vs Box B with Photon Inside

    Imagine you have two boxes, each with a photon of equal frequency inside the boxes. The boxes, however, have different side lengths (yet, the boxes on their own are equal in mass). Wavelength of photon << Length of Box A < Length of Box B I've seen that a photon increases the mass of the...
  17. Nahsor1

    What is the Weight and Normal Reaction of a 10 kg Box on a Table at Rest?

    Homework Statement weight of the box 10 kg on table at rest. Homework Equations deternmine weight of box and normal reaction acting on it. also determine w and Fn if force 40N pushes down the box. The Attempt at a Solution s i did like w=mg =NORMAL REACTION(R) and 40=10 * acceleration due to...
  18. gfd43tg

    Solving 3D Particle in a Box Homework

    Homework Statement Homework EquationsThe Attempt at a Solution a) for ##0 \le x,y,z \le a##, the potential is zero. Therefore, the 3d schrödinger equation is $$ - \frac {\hbar^{2}}{2m} \nabla^{2} \psi = E \psi $$ Is it okay to write 3 equations $$ - \frac {\hbar^{2}}{2m} \frac {\partial^{2}...
  19. B

    Box on Inclined Plane (with Friction)

    Homework Statement A crate of mass 9.2 kg is pulled up a rough incline with an initial speed of 1.52 m/s. The pulling force is 110 N parallel to the incline, which makes an angle of 20.6° with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 4.94 m. (e)...
  20. E

    Critical angle for a box to start moving on an incline

    Homework Statement A ramp with an angle given by ø (from the horizon) and a box of mass represented by "m" with a given µ=0.55 between the ramp and the box, find the minimum (critical) ø for which the box will begin to move down the ramp. Wether µ is kinetic or static is not given in the...
  21. gfd43tg

    Probability of observing E for particle in a box

    Homework Statement Homework EquationsThe Attempt at a Solution Since this is discrete, I know the probability is equal to ##|a_{n}|^{2}##, hence the probability of observing ##E_{1}##, ##P(E_{1}) = \frac {9}{25}##, and ##P(E_{2}) = \frac {16}{25}##. However, I just sort of remembered this...
  22. M

    Particle in a box - Momentum and Energy

    Hi, I have a problem understanding the particle in a box (V=0 inside, V=∞ outside), how is it possible that momentum can vary continuously while the energy spectrum is discrete? Aren't they related by E=p2/2m? What I am missing? Thanks!
  23. M

    The Cooper pair box Hamiltonian in the matrix form

    Hello, In my problem I need to We are advised to create the Cooper pair box Hamiltonian in a matrix form in the charge basis for charge states from 0 to 5. Here is the Hamiltonian we are given H=E_C(n-n_g)^2 \left|n\right\rangle\left\langle...
  24. nomadreid

    The black box in Deutsch's algorithm

    I am not sure whether this question should go in Quantum Physics, Computers, or Linear Algebra. I am willing to see it moved if appropriate. In Nielsen and Chuang's "Quantum Computation and Quantum Information", in explaining quantum parallelism in section 1.4.2 (as a preparation for Deutsch's...
  25. goonking

    Static Friction of sliding box on plane

    Homework Statement Homework Equations Fs = μ FN The Attempt at a Solution Ok, so I drew a free body diagram and tilted it 90 degrees so that Fg of the small box points right and Fstatic points left. Fg = 4.7 kg x 9.8m/s2 = 46 N we want Fs to equal 46 N , correct? so we use the formula Fs...
  26. A

    Box sliding down wall at constant speed

    Homework Statement The 2.0 kg wood box in the figure slides down a vertical wood wall while you push on it at a 45 ∘angle. https://session.masteringphysics.com/problemAsset/1070374/4/06.P51.jpg Homework Equations ΣFY = FPY - mg The Attempt at a Solution I know that since there is a constant...
  27. J

    What is the Universe expanding into?

    All that is visible to the human eye is that which can be seen at the furthest limits of the Cosmos, which began with the Big Bang. So then, what could exist from that point on? What space or material is the expanding Universe encroaching into, and either pushing it away, or transforming it into...
  28. N

    What P Value Causes Sliding or Tipping of a Box?

    A box is 8 ft high, 4 ft deep, and 6 ft wide and weighs 270 lb. A worker pushes on the box at a location along the width and 5 ft above the floor. The coefficient of friction between the box and the floor is .53. 1) Determine what value of the pushing force, P, will cause sliding. 2) Determine...
  29. A

    DE for modelling motion of a box

    So if you were to slide a box-like object down a straight ramp with a single gradient (its literally just an incline no curve). And you attempt to model it accurately would this be correct? Given the DE ma=mg-kv where a=dv/dt, mg=force of gravity, kv= force of friction Anyway my main question...
  30. P

    Minimum Force such that box m does not slide down

    Homework Statement Homework Equations F = ma; f = µN The Attempt at a Solution Let F' be the action-reaction force between box m and box M f be the friction on small box m For small box m: F' = ma f - mg = 0 µF' - mg = 0 since f = µF' µma - mg = 0 since F' = ma a = g...
  31. goonking

    Solving Velocity of a Box Off a Ramp

    Homework Statement http://imgur.com/VwoDF58 Homework Equations How would I calculate the velocity the box gets off the ramp? I believe I need to use Vf = Vo + 2 a x a is gravity so it is -9.8, correct? but what do i put in as x? 5, which is the length of the ramp, or 4, the base, or 3 the...
  32. L

    Energy Probability of Electron in 1d box

    Homework Statement We're given an unnormalized state function ψ(x) of an electron in a 1 dimensional box of length pi. The state function is a polynomial. We're asked to find the probability that a measurement of its energy would find it in the lowest possible energy state. Homework Equations...
  33. W

    How Long Does a Box Slide Up a Ramp?

    Homework Statement You are helping your friend move, using a ramp to move boxes from the ground to the moving truck. You give a 26kg box a shove so it moves at 1.4mhttps://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngs at the bottom of the ramp. The angle that the ramp makes...
  34. L

    Probability of finding a particle in a 1D box

    Homework Statement If a one-dimensional box is 1 nm long, what is the probability of finding the particle between the following limits? (a) x = 0 nm and x = 0.05 nm (b) x = 0.55 nm and x = 0.65 nm Homework Equations ψ = (2/L)½ sin(πx/L) The Attempt at a Solution (I do chemistry and I'm really...
  35. R

    Energy Eigenstates inside a one-dimension box

    How many energy eigenstates can "fit" inside a one-dimension box of length L?
  36. P

    Heat energy dissipated from moving box with friction

    Homework Statement A box of books that weighs 40N is dragged at a speed of 1.5 m/s across a rough floor. If the coefficient of friction between the floor and the box is 0.20, what is the rate at which heat energy is dissipated? Homework Equations Friction: f=μN Work: W=F*d Power: P=W/t The...
  37. T

    Electric flux through cubical box

    Homework Statement If the electric field is constant in direction (horizontal in the x direction) but its magnitude decreases from E1 to E2, determine the flux through a cubical box of side length L if four of the sides of the box are parallel to the field. Homework Equations ∫EdA = flux The...
  38. F

    Dynamics Problem -- box accelerated horizontally via a mass & pulley system

    Homework Statement A 1.0 kg box on a horizontal frictionless surface is accelerated by attaching a 1.5 kg mass as shown in the diagram. What is the magnitude of acceleration of the box?(Remember, both boxes accelerate.) Homework Equations F = ma The Attempt at a Solution I drew a free body...
  39. J

    Pulley Problem: Keeping boxes stationary on another box

    Homework Statement Homework Equations ##F_{net} = ma## The Attempt at a Solution If ##m_2## accelerates, then the force on this box is ##m_1g## and its acceleration is ##\frac{m_1g}{m_2}##. If I disregard the presence of ##m_1## for a minute, I'll have to push on ##M## with a force such...
  40. C

    How TO make a variable 3D metal box

    Hi i want to know how to make a 3D metal box whose length, width, and height i can change. For example, i have a box of 3 m x 3 m x 3 m. i should be able to extend any dimension by a maximum of 1 meter i.e 4 meter (say). I want to use this to store items whose size is unknown, but the limits of...
  41. B

    Calculating Box Stability: An Energy Approach

    Ok I know this should be easy but it's been a few years since my physics lessons at college and I'm stumped. I work in packaging. I'm working on a tool that will tell me if a box will fall over when it is subjected to an edge drop test. That means that a block is placed under one edge of a box...
  42. G

    Solving the Initial Velocity of a Box: Homework Woes

    Homework Statement A UPS delivery man pushes a 5kg box (A) along a smooth surface where the coefficient of kinetic friction, [µ][/k], is equal to 0.20. The box slides for 1.5m before colliding with a 3kg box (B). The boxes then move together as one unit on a rough surface with [µ][/k]= 0.9 for...
  43. P

    Electron in 1D Box: classical or quantum at different temps

    Hi, I'm working on a problem that requires me to calculate thermal energy (kT) at different temperatures and compare those values to the lowest state energy of a particle in box (1D) of varying lengths. I've calculated the ground-state energies of the electron in all of these different sized...
  44. N

    Mass Needed to Accelerate a Box Along a Pulley

    Homework Statement Okay, so I am given an acceleration that I need to accelerate a box-thingy, along with a weight inside. Friction is included. I need to come up with a mass that is connected through a pulley to the box. This mass has to accelerate the box at the given acceleration. I am not...
  45. S

    Two-dimensional infinite potential box

    Homework Statement A particle in two-dimensional infinite potential well $$ H=\frac{p^2}{2m}+\left\{\begin{matrix} 0, & |x|<\frac{a}{2}\text{ and }|y|<\frac{a}{2}\\ \infty , & \text{otherwise} \end{matrix}\right.$$ a) Find eigenfunctions and their energies. Also describe the degeneration of...
  46. DivergentSpectrum

    Construct a regular grid in a rectangular box in 3 dimensional space

    Im trying to construct a regular grid in a rectangular box in 3 dimensional space heres what i have to work with: x has a range between xmin and xmax y has a range beween ymin and ymax z has a range between zmin and zmax the total number of points is limited to a specific number n i want the...
  47. fluidistic

    Sudden perturbation, particle in a box, ground state

    Hi guys! Suppose there's a particle in a box, initially in its ground state. Suppose that one chooses a system of coordinates such that the potential V(x) is 0 from 0 to L. Suppose that one suddenly perturbate the system at a particular time so that V(x) becomes 0 from 0 to 2L. I've calculated...
  48. R

    Probability for a particle in a box

    Homework Statement A particle in a box of width 2a is in a state \psi=\frac{1}{\sqrt{2a}} for |x| less than or equal to a and 0 for |x| greater than a. What is the probability of finding the particle in [-b, b] inside the box? What is the probability of finding the particle with momentum p...
  49. C

    Viability of particle in a box modeling

    I've noticed that the example of a particle in a box is heavily used even for physical situations where there is no obvious box: for example when finding the degeneracy pressure in a neutron star one calculates the fermi-energy from a 3D-particle in a box. So I wondered: is there any good...
  50. H

    Convergence Criteria for Box Topology on R^ω

    Hi, What are the convergent sequences in the box topology on R^ω?Are they the eventually constant only? Thank's in advance
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