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. W

    Boxes hanging attached to box on shelf

    Homework Statement A box of mass m2 = 3.5kg rests on a frictionless horizontal shelf and is attached by strings to boxes of masses m1 = 1.5 kg and m3 = 2.5kg, which hang freely as shown in the figure. The system is initially at rest. After it is released, find A) the tension in each string and...
  2. N

    Elastic and gravitational potential energy, with friction and a box on incline.

    [SOLVED] Elastic and gravitational potential energy First off, long time lurker here on his first post. Your forum seems absolutely brilliant, so I hope you can help me :) Homework Statement A box on an elastic string is dropped down an incline and proceeds to slide the distance L before...
  3. T

    Rotate Big Box: What Tool to Use?

    Guys,, how can i rotate a big metallic box,, what should i use ! what is its name in english ?? rotating cylinder? rotating discs? what's the name of the thing? anyone got me ?
  4. Amith2006

    Particle in a Box: Odd/Even Parity Explained

    Homework Statement Consider a particle in a 1-D box with impenetrable walls at x=0 and x=L. Then the eigen function for this problem is of the form, \Psi(x) = \sqrt{2/L}sin(n\pi\ x/L) This is always of odd parity. The question which is troubling me is that, in this case...
  5. L

    Find Min Area of Box for 5in x 7in Book: Explanations

    Homework Statement A book with cover dimensions 5in x 7in is to be placed symmetrically in a diamond shaped gift box. What is the smallest possible area of the box? Explain how you know your answer is minimal. Homework Equations n/a The Attempt at a Solution i don't know how to...
  6. A

    Force applied at an angle to a box?

    Homework Statement A net force of 4N to the right is applied to a box of 6kg while moving it a distance of 3m to the right. (1)How much work is done on the box? (2)What if the force is applied at a 30 degree angle above horizontal? Homework Equations (1) W=Fdcos(angle) (2)...
  7. A

    Find the Normal Force of a box in an elevator cab

    Homework Statement Elevator cabs A and B are connected by a short cable and can be pulled upward or lowered by the cable above cab A. Cab A has mass 1700 kg; cab B has mass 1300 kg. A 12.0 kg box of catnip lies on the floor of cab A. The tension in the cable connecting the cabs is 1.91×10^4...
  8. G

    Misner-Thorne-Wheeler, p.92, Box 4.1, typo?

    In Misner-Thorne-Wheeler Gravitation, Chapter 4, Page 92, Box 4.1, at section 4, there is a formula for the contraction of a p-form and a p-vector. Now, it states that the contraction of a p-form basis with a p-vector basis gives the antisymmetrizer symbol, \left\langle {\omega ^{i_1 } \wedge...
  9. D

    Light in the box gravity - question.

    I have a massless and perfectly reflecting sphere or a box. Inside I have 0.5kg of matter + 0.5kg of antimatter. Far away from this sphere I have a small test body. I detects a gravity from mass of 1kg. Now matter and antimatter annihilate. As nothing happens outside, the test body is...
  10. S

    Constructing a Cubical Box to Within 3 cm3

    Homework Statement a) A cubical box is to be built so that it holds 125 cm3. How precisely should the edge be made so that the volume will be corrected to within 3 cm3? The Attempt at a Solution I am not sure even what this is asking exactly could someone decode if they have seen a...
  11. G

    Atom Wave Function: Definition & Explained

    Below is an excerpt from Quantum Enigma: Physics Encounters Consciousness. I have a few questions following the text. The text goes on to describe that by opening holes in the boxes, the wave function leaks out of both boxes and falls on a screen to which an atom will stick, resulting in...
  12. L

    Energy required to lift a heavy box (pulley problem)

    1. As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the...
  13. N

    What is the force acting on a box on a conveyor belt?

    I'm trying to figure this out. Suppose a box is on a conveyor belt, and the conveyor belt is moving faster and faster to the right, so that static friction has already been overcome. This means that relative to the conveyor belt, the box is accelerating to the left. But what is the net force...
  14. M

    How much work and how much force do we use in pushing a box

    Homework Statement How much work do we do when we pull a wooden block with a mass m = 1 kg and we displace it for ∆x= 1 m. The object is being pulled on a rough surface with a coefficient of friction µ_k = 0.1. We are pulling the object with a string; the angle between the string and the...
  15. Y

    Help Understanding "Energy Levels" in "Particle in a Box"

    Hi... I'm reading about "Particle in a box", and I really can't seem to figure out what "Energy Levels" actually means. The thing in my book is a bit slacky, so I'm not quite sure that I understand. So could anyone maybe explain to me what the "Energy Levels" in "Particle in a box" is ...
  16. A

    Max Force on 3.0kg Box to Accelerate: Find the Answer

    Homework Statement Two boxes sit on a table, connectedn by a massless string. The first is 2.0 kg and the second is 3.0 kg. The coefficient of kinetic friction betweent the boxes and the table is 0.80. The max tensile strength is 1000 N. What is the max force that can be exerted on the 3.0 kg...
  17. C

    How Far Does a Box Slide Before Stopping If Pushing Force Is Removed?

    Homework Statement A stockroom worker pushes a box with mass 11.1 kg on a horizontal surface with a constant speed of 3.80 m/s. The coefficient of kinetic friction between the box and the surface is 0.170. Homework Equations F=ma w=mg What horizontal force must be applied by the...
  18. C

    Pushing a box across horizontal surface

    Homework Statement In a physics lab experiment, a 6.25 kg box is pushed across a flat table by a horizontal force F If the box is moving at a constant speed of 0.400 m/s and the coefficient of kinetic friction is 0.120, what is the magnitude of F? What is the magnitude of F if the...
  19. O

    Tension in cables pulling a box

    Homework Statement A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0o on either side of the vertical direction. What is the tension in each cable? Homework Equations Force = mass(acceleration) Weight = mass(gravity) The Attempt at a...
  20. G

    Find the Force Needed: Wood Box Sliding Down a Wall

    Homework Statement A m = 2.7 kg wood box slides down a vertical wood wall while you push on it at a θ = 35° angle. What magnitude of force should you apply to cause the box to slide down at a constant speed? Homework Equations The Attempt at a Solution I got 64.5766 N for the...
  21. I

    Projectile Motion: Hitting a box with a softball

    Homework Statement Students at an engineering contest use a compressed-air cannon to shoot a softball at a box being hoisted straight up at 10m/s by a crane. The cannon, tilted upward at a 30 degree angle, is 100m from the box and fires by remote control the instant the box leaves the ground...
  22. F

    Can a person slow down their free fall by pushing a heavy box?

    hello, consider a man falling from a roof with a heavy box in his hands. what should he do with the box?
  23. L

    Can you detect motion inside a spinning box?

    If you are inside a box that is spinning, can u detect its motion? At first i was thinking you can't the same way as if the box is moving forward. However, I was thinking that moving in a straight line involves one vector while spinning creates different ones so that you CAN detect...
  24. P

    Solving the Black Box Circuit: Determining Impedance & Resistance

    if a black box was given,with two wire pull out from the box.no other additional info was given,then how will you determine the impedance in the circuit?what is the resistance?if given that is a passive circuit,what will the circuit look like? seem the task quite challenging.
  25. S

    Light in a perfect reflective box

    Hi guys i thought I've seen a thread on this before but i was wondering, supposingly you have a black box which is totally airtight and made in such a way nothing, not even an atom is capable of escaping from the box. This box is also 100% reflective on all sides and in the middle of the box...
  26. C

    Particle in a box: possible momentum and probability

    Homework Statement \Psi(x,0) = \frac{1}{\sqrt{L}}, ~~~~~~ \left|x\right| < L/2 At the same instant, the momentum of the particle is measured, what are the possible values, and with what probability? Homework Equations The Attempt at a Solution Well, I know that \Delta{}x = L so can I then...
  27. C

    Volumes of Spheres around a Box

    Homework Statement Let B be a solid box with length L, width W, and height H. Let S be the set of all points that are a distance at most 1 from some point of B. Express the volume of S in terms of L,W, and H. Homework Equations 4/3(pi)r The Attempt at a Solution I have gotten to...
  28. I

    Friction Force between the box and the floor?

    Homework Statement A heavy box (200.0 kg) is sitting still on a warehouse floor, despite the efforts of a worker to push it (with a force of 300.0 N). If the coefficient of static friction between the box and the floor is 0.6, what is the friction force between the box and the floor? What is...
  29. K

    A 6kg box is placed on a 32degree frictionless ramp. Find accel. of the box.

    I have the solution to the problem but I don't get the part how you rotate the axes and then solve from there. For example in the x direction Fx = max +mg sin32 = max Fx = Force in x direction ax = acceleration in the x direction Can someone explain this?
  30. C

    Maximum Volume of an Open Top Box

    Homework Statement Is there another way to do this question? Is this right? L = 50-2x W = 40-2x Height= XHomework Equations // V=L x W x H V= (50-2x)(40-2x)(x) V= (2000 -180x +4x²)(x) V= 2000x -180x² +4x³ V= 4x³ - 180x² +2000x V' = 12x² -360x +2000 X = (360 (+/-)sqrt(360²-4(12)(2000))) /...
  31. H

    Thinking outside the box a requisite to being motivated

    I just spotted another thread where the poster asked "can a modern scientist be religious". I thought about it and I realize that my crazy notions are some of my biggest motivators behind me aspiring to become a scientist. There could be unseen phenomena all around us that is yet to be...
  32. Y

    The truck, the box and the slide

    problem is attached as image... i asked on yahoo answers, received a reply but is wrong... it is very challenging (in my opinion).. I spent over an hour without reaching even a wrong option..
  33. Z

    Truck deceleration to prevent box from sliding

    Homework Statement The coefficent of static friction between the floor of a truck and a box resting on it is 0.38. The truck is traveling at 69.7 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide? Homework Equations The Attempt at...
  34. S

    A box sliding down a incline plane

    A 3kg block starts from rest at the top of a 30degree incline and slides a distance of 2m down the incline in 1.5s find the magnitude of the acceleration. I have always though to find the acceleration you can just use x/(t*t) but i use this formula but i couldn't get the same as the book. is...
  35. S

    What happens with a 'Light in a box theory'

    I have no background in physics, but I have a question about light. Might consider it the 'Light in a box theory'. What would happen if you could make a box or sphere of mirrors that would constantly accept incoming light and focus the light into an infinite loop with little or no...
  36. M

    Position of particle in a box, is this a valid way to solve?

    Homework Statement This is problem 2.4 from Griffiths, where he asks to find the expectation value of the position of a particle in a box. Homework Equations Schrodinger equation. The Attempt at a Solution I wrote that \frac{2}{a} \int_0^a x (sin(\frac{n \pi}{a} x))^2 dx =...
  37. W

    Volume of a Box + Finding all solutions

    1. See Attachment 2. None 3. a. I found the volume of the box which is like this x(24-2x)(24-2x) = x(576-96x+4x2) = 4x3 - 96x2 + 576x = 4(x3 -24x2 +144x) but how do I find the domain? b. and c.How do I use...
  38. E

    Why Does the Spherical Box Partition Function Differ from the Cartesian Box?

    Homework Statement Hello everybody: I have a problem with the Schrödinger equation in 3D in spherical coordinates, since I'm trying to calculate the discrete set of possible energies of a particle inside a spherical box of radius "a" where inside the sphere the potential energy is zero...
  39. M

    Volume of a box using differentiation

    Hello :smile: I'm really stuck on a question and could do with some help. Homework Statement http://img268.imageshack.us/img268/2161/19947313.jpg Homework Equations http://img139.imageshack.us/img139/3478/24591171.jpg The Attempt at a Solution...
  40. J

    Interpreting Box Plots with Questionnaire Data

    Dear all, I need to evaluate some data from questionnaires (in the form of scale of values from 0 to 10) and I thought to use the box plots. Please, someone can provide me with some helps (references,etc) for the interpretation? In some cases, the median does not falls inside the box but it is...
  41. B

    Solving for the Speed of a Box on an Incline

    Hello: Can someone help with the following: A 2.0 kg box on a frictionless incline of angle theta = 40 is connected by a cord that runs over a pulley to a light spring of spring constant k = 120N/m. The box is released from rest when the spring is unstretched. Assume pulley is massless and...
  42. Spinnor

    Black box replaced with continous data transfer?

    If the amount of data contained in a aircraft black box was not too large could such info be sent out on an additional aircraft radio channel and collected for all aircraft in real time thus eliminating the need for physical black boxes? At least then we would not have to search the bottom of...
  43. maverick280857

    Convergence of vacuum state of Klein Gordon field in a box

    Hi I've been reading through the book "Quantum Field Theory: A Tourist Guide for Mathematicians" by George B. Folland. On page 101, he describes the construction of a scalar field "in a box" \mathbb{B}: \left[-\frac{1}{2}L,\frac{1}{2}L\right]^3 in \mathbb{R}^3. Here \bf{p} lies in the...
  44. D

    Green's Function for Poisson Equation w/ Mixed BCs

    Hello I am trying to build a 3D Poisson solver using method of moments. I need to find out the Green's function for the system. My system is a rectangular box and boundary conditions are as follows: On all surfaces BC is neumann. Only on the upper and lower surface, the middle 1/3 region...
  45. D

    Condensation inside a close box

    I have an out-door cabinet (with PCB) that over time is being damaged due to condensation (humidity). I would like to minimize these damages over time (corrosion, etc...) The cabinet is closed but not 100% sealed. Cabinet size is 80X20X20cm. How do I avoid the damages due to condensation of...
  46. C

    Free Particle 1D: Box Normalization Question

    Question Free particle in 1D where V(x) = 0. There is a general boundary condition \psi(x+L)=e^{i\theta}\psi(x) used for box normalization which has arbitrary phase theta. E=k^2\hbar/(2m) is true for free particle energies. Attempt Comparing with the condition \psi(x+L)=\psi(x) I don't see...
  47. M

    Mass in a Falling Box: Investigating its Behaviour

    Homework Statement A mass (weight 100g) is hanged on a spring inside a cubic box (side a=1m). Stiffness of the spring is 10N*m-1. Equilibrium state of the spring is right in a centre of the box. Now, we let the box fall to the ground from height h. Describe a behaviour of the mass inside...
  48. C

    Momentum eigenstates particle in box

    Quantum mechanics says measurement of observable always produces result that is one of eigenvalues of that observable. Subsequent measurement yields same value. For a particle in a box with infinite potential barriers if measure momentum doesn't that put system in eigenstate of momentum insuring...
  49. V

    How to Distribute Gas Atoms in Two Boxes?

    Homework Statement N atoms are in two boxes, box A: volume=V, and box B: volume=3V. (Assume a atoms make up a low density perfect gas). 1) How many ways can n be chosen, where n=(number of atoms in box A)? 2) Each atom if allocated a spatial state. Assuming that the number of available...
  50. U

    Quantum Mechanics particle in a box question

    Homework Statement Consider an electron that is constrained to be in a one dimensional box of size L, but is otherwise free to move inside the box. i.) Write down the (time independent) Schrodinger equation for this particle, the boundary conditions for the wavefunction Ψ and find an...
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