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. K

    Comparing Work Done Lifting a Box: Man vs. Woman | Understanding Force and Time

    I need some help understanding work. If a man lifts a box up to a shelf and a woman lifts the same box up to the same shelf in half of the time, who is doing more work? I understand that they're moving it the same distance but isn't the woman using more force because she is getting it to...
  2. adjacent

    Box Toppling: Causes and Effects

    I don't know if "toppling" is even a word.:rolleyes: This is not a homework,just a question. https://www.physicsforums.com/attachment.php?attachmentid=68762&stc=1&d=1397811697 If I apply a force at A,the box will topple and fall.(Probably because of friction) If I apply a force at B,the...
  3. B

    Conservation of Momentum of a box of mass

    Homework Statement Box A of mass 1.20 kg is sliding to the right across a frictionless table at a speed of 2.52 m/s. Box A collides with Box B which has a mass of 2.56 kg, and Box A bounces straight back to the left with a speed of 0.665 m/s. A) What is the momentum of Box A before the...
  4. Y

    Box pushing another box Dynamics

    Hi, I have an exam soon. This is urgent. Can you check my answer? A box with mass 100kg is being pushed with enough force such that a second box with mass 2kg does not slide down and the two accelerate to the right together. If us=0.5 and uk=0.1, what is acceleration minimum such that box m2...
  5. D

    Jar of water in a box, how would You prevent condensation?

    I'm not sure if this is the right section... But Assume you have a medium sized box (about as big as a large desktop computer) inside a room. And inside the box there is a jar of water that is significantly colder than the outside temperature. How would you prevent water condensation...
  6. Z

    Shear Flow Box Beam (Close to the answer)

    Homework Statement Homework Equations The moment and shear flow equations Solved with Matlab The Attempt at a Solution I am getting real close to the answer but something is off and I can't figure it out. The full code (Matlab) deg = pi/180; G = 4.e6...
  7. jdawg

    Center of Mass for a cubical box with a missing top

    Homework Statement A cubical box has been constructed from uniform metal plate of negligible thickness. The box is open at the top and has edge length L=40cm. Find (a) the x coordinate (b) the y coordinate, and (c) the z coordinate of the center of mass of the box. Ok, so my professor...
  8. B

    Finding Highest Energy for Fermions and Bosons in a Box

    Homework Statement a. Electrons and neutrons are fermions. Put 12 of them (6 each) in a box, and determine the n value for the ones with the highest energy. b. Do the same for 12 bosons (6 are pi zero bosons and 6 are alpha particles). Homework Equations En = (h2n2)/(8mL2) The...
  9. P

    Finding the volume of air in a box when it's lowered into water?

    Homework Statement A box that is open at the bottom is lowered into the sea (density like water). The outer volume of the box and the air inside it is V_{out}=3 m^3. The moment the box touches the sea surface the air inside it gets trapped and has a volume at V_0=2.5 m^3 and a pressure at...
  10. H

    How to calculate maximum load of the box

    Hi I attached the file. there are 3 different types of forces applied. and material's yield strength is 55.1 MPa or 8000 psi. I want to find maximum load of box for each types. I don't know which equation I can use. because the box is empty. the dimension of box is width: 70mm, length...
  11. vhbelvadi

    Feynman's box and tennis balls problem

    Introduction: This isn't really a homework question in that I recently came across Feynman's original problem sets that had accompanied his famous lectures of 1960 and decided to solve them (and I've been doing rather badly). But at some point, I figured it would fall into this category best...
  12. D

    Coefficient of static friction of a sliding box

    Homework Statement A box rest on an incline making a 34 angle with the horizontal. It is found that a parallel force to the incline of at least 235 N can prevent the box from sliding down the incline. If the weight of the box is 800 N, find the coefficient of static friction between the...
  13. F

    Particle in a box and electron excitation

    Homework Statement Hello everyone, I have a question from a practice exam I can't seem to figure out. 1. A Ca atom (atomic number = 20) is in the ground state. Light is shined on the atom, exciting the most energetic electron. Which of the following are possible quantum numbers (n,l,m) of...
  14. MarkFL

    MHB Torres' question at Yahoo Answers regarding minimizing the cost of a box

    Here is the question: I have posted a link there to this thread so the OP can view my work. edit: Before I could post my solution the OP deleted the question.
  15. L

    Probability of Particle in Box: Changing w/ Increasing n

    Homework Statement Particle is put in into the infinity potential well. How the probability of finding particle between different maxima of probability density is changing by increasing of ##n##? Homework Equations ##\psi_n(x)=\sqrt{\frac{2}{a}}\sin \frac{n\pi x}{a}##...
  16. L

    MHB Maximizing the surface of a cylinder and a box

    ¿The post office has established that the length and the outline of any parcel may exceed the 100 cm. under such restriction find the dimensions for: 299) circular cylinder straight greater possible surface. Answer R = 50/(2pi-1) H= 100(pi-1)/(2pi-1) 301) rectangular box of square base of...
  17. R

    Wave Function for 1000 Particles in a Box

    Homework Statement At the instant t=0, there's a system with 1000 particles in a box of length a. It is known that 100 have energy 4E1 and 900 have energy 225E1, where E1 is the energy of the fundamental state. i) Build a wave function that can represent the state of a particle ii) How many...
  18. F

    Pendulum in a freely moving box

    Homework Statement A box of mass M can slide horizontally on a frictionless surface. A simple pendulum of string length l and mass m, is suspended inside the block. Denote the coordinate of the centre of mass of the box by x and the angle that the pendulum makes with the vertical by θ . At t =...
  19. D

    MHB Maximizing Volume of a 5-Sided Box w/ Cutout Corners

    Consider a sheet of length L and width W. Each corner is cut out (x by x corners removed). Detemine the value of x so when the corners are removed and flaps folded up, the five sided box formed will have maximum volume. SA \(= 1LW + 2 LH + 2WH\) and V \(= LWH\). I am not sure how to do this...
  20. A

    Practice Test- Box sliding down a slope

    1. A 30kg box is placed on a 15° slope and a person pushes on the box up the slope to keep it from sliding. If the coefficient of static friction is 0.15, what is the minimum force that the person must exert to keep the box in place? Answer Choices: A. 273N B. 241N C. 33.5 N D. 64.7 N E. 294 N...
  21. G

    Change in Kinetic Energy for a Sliding Box

    Homework Statement A 5.0 kg box slides up a 10 m long frictionless incline at an angle of 20 degrees with the horizontal, pushed by a 40 N force parallel to the incline. What is the change in kinetic energy? Homework Equations Ek = 1/2 mv2 Ep = mghThe Attempt at a Solution I tried to assume...
  22. P

    Two distinguishable particles in a box.

    Hi, Homework Statement I would like to determine the number of energy states two free, distinguishable particles in a box of length L have. I would then like to determine the number of states two free, indistinguishable particles, with spin 3/2 each, have in that box at the elementary level...
  23. D

    Classical/quantum transition for an ideal gas in 1m^3 box

    Homework Statement Hey guys, So I have to estimate the temperature at which the classical / quantum transition happens for a 1m^3 box of air. This is done by comparing the de Broglie wavelength with the average distance between the particles - so basically the transition happens when they...
  24. jdawg

    Finding F1 - Summing forces on a box

    Finding F1 -- Summing forces on a box Homework Statement There are two forces on the 2.80 kg box in the overhead view of the figure but only one is shown. For F1 = 10.9 N, a = 10.2 m/s2, and θ = 34.9°, find the second force (a) in unit-vector notation and as (b) a magnitude and (c) a...
  25. S

    How Is Tension Calculated When a Woman Dangles a Mass Over a Cliff?

    Homework Statement A 50 kg woman dangles a 50 kg mass from the end of a rope. If she stands on a frictionless surface and hangs the mass over a cliff with a pulley as shown, the tension in the rope will be... Homework Equations F = m*a The Attempt at a Solution (no calculator...
  26. B

    Box problem on work/force/energy

    Homework Statement A 50Kg box is pulled across the ground with a force of 250 N. The speed of the box is a constant 4m/s for 3 seconds. Friction is NOT 0. a) What is the net work done on the box by all forces ? b) How much work is done on the box by applied forces? c) What is the work...
  27. M

    What Would Happen w/ Infinite Light Box?

    Here's the scenerio: you have box (shape is not necessarily important, but for simplicity we'll say its a cube), within the cube is a vacuum and the inside of the box consists of "perfect" mirrors, meaning that no light is absorbed (obviously this is not possible in the real world), however...
  28. J

    Sliding box question- finding applied force with friction

    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 Ff= uk(Fn) The...
  29. M

    D'Alembert's Principle:- A Falling Box

    I've been asked to research D'Alembert's principle and solve a question. I've looked up quite a lot of different explanations on the internet of D'Alembert's Principle and I'm not quite grasping how to use it. I understand that you rearrange formula so that they equal 0 (e.g. f - ma = 0 or PE -...
  30. A

    Why Can't We Calculate Work Done by Friction?

    Using Knight's Physics : A Strategic Approach (3rd edition): I am on the section concerning dissipative forces. A box is pulled with a rope on a surface with friction at a constant speed. The book says Wtension=Change in thermal energy. By Newton's First Law, the book says: Change in thermal...
  31. U

    Effusion of molecules into a Box through a hole

    Homework Statement A container of volume 10−3 m3 has a pressure of 10−7 mbar. Surrounded by air at 1 bar and 290 K, how long does it take the pressure inside to rise to 10−6 mbar when air effuses through a small hole of area 10−17 m2? Homework Equations The Attempt at a Solution Flux ø =...
  32. H

    Energy of a system-a box moving in a circle

    Homework Statement A light spring has unstressed length 15.5cm.It is described by Hooke's law with spring constant 4.30N/m.One end of the horizontal spring is held on a fixed vertical axle,and the other end is attached to a punk of mass that can move without friction over a horizontal...
  33. P

    Minimum force required to turn over box.

    Hi, Homework Statement I would like to determine the position, magnitude and direction of the minimum force F required to turn over the box shown in the attachment (width - B, height - H). The (uniform) box is placed on a horizontal plane. The coefficient of friction between the box and the...
  34. H

    Box on a Board: Finding Minimum Pulling Force

    Homework Statement A small box of mass m1 is sitting on a board of mass m2 and length L. The board rests on a frictionless horizontal surface. The coefficient of static friction between the board and the box is, as usual, less than μs. The board is pulled with a force F, as shown. We wish...
  35. M

    Could Earnshaw be only thinking inside the box

    Hello PF people i just joined the forum after many many months of being driven insane concerning Earnshaw's Theorem, i myself am not a scientist or physicist so i am limited in the amount of knowledge that i have, but my curiosity won't let me accept what everyone else seems...
  36. MarkFL

    MHB Solve Box Cost Minimization w/ Lagrange Multipliers

    Here is the question: I have posted a link there to this topic so the OP can view my work.
  37. G

    Particle in a box Schrodinger equation

    I'm going though the particle in a box lesson in my physics textbook right now. I understand all the math, but don't understand a lot of the physics behind it. Also this is an intro physics course, we're only covering the basics of quantum mechanics and not going into too much detail. How come...
  38. M

    Force Applied to Box on Incline

    A force is applied to a box that is initially at rest on an inclined surface. The incline is at an angle θ=20.0° above horizontal. The mass is m=36kg and the vertical force is Fapp= 48N. Between the box and the inclined surface the coefficient of static friction, μs=.240 and a coefficient of...
  39. R

    Particle in a box, some clarification please

    the energy of an n state can be given by: E = (nh)^2 / 8mL^2 is this a representation of the Kinetic energy of the particle? i thought it was but this question has got me confused. it asks for the Energy of the n=1 state, which I've done. then it asks what quantum number, n would be needed if...
  40. B

    Quantum Mechanics particle in Box Normalization

    Homework Statement A particle confined to a cubic box of dimension L the wavefunction normalization factor is (2/L)^3/2 , the same value for all stationary states. How is this result changed if the box has edge lengths L1, L2, L3, all of which are different. Homework Equations...
  41. D

    Degenerate Perturbation Theory (Particle in 3D box)

    Homework Statement Consider a particle confined in a cubical box with the sides of length L each. Obtain the general solution to the eigenvalues and the corresponding eigenfunctions. Compute the degeneracy of the first excited state. A perturbation is applied having the form H' = V from 0...
  42. G

    Washer Hanging from Box Moving Down a Ramp

    Homework Statement A steel washer is suspended inside an empty shipping crate from a light string attached to th top of the crate. The crate slides down a long ramp that is inclined at an angle of 37° above the horizontal. The crate has mass 180kg. You are sitting inside (with a flashlight)...
  43. D

    No 2D momentum average for a particle in a box?

    Hello Everyone, Happy Thanksgiving. I have physics issues. I went around the entire boundless universe in the last two days, and found out the Schrodinger forgot to develop the math for the momentum expectation value for a 2-D particle in a box. It's nowhere to be found. I am a chemistry major...
  44. D

    Why is there no help: momentum expectation value 2D particle in a box

    Is there anyone out there that knows how to define the p operator for a 2-d box. Please can you give a full answer, and not only a hint. I think that no one on this planet knows what it is. I have looked all over the internet. If there is no answer. Why don't people just say it? I think nobody...
  45. R

    How Do You Calculate the Probability of Finding a Particle in the Ground State?

    a particle is confined in a potential box 0≤x≤a. when t=0 wave function is given: ψ(x,0)=1/5(√6sin(∏x/a)+2sin(2∏x/a)). find probability of finding the particle in ground state and energy in ground state ! anyone please tell me how to solve the problem
  46. R

    What is the acceleration and time for a block on an inclined plane?

    I am stuck on a problem from the 5 Steps to a 5: AP Physics B&C book and would really appreciate anyone's help. Homework Statement Determine (a) the acceleration of the block down the plane and (b) the time for the block to slide to the bottom of the plane...
  47. A

    Tipping point for box on incline

    I'm wondering if anyone can help me with a problem that I came up with while trying to design an alarm-hourglass for myself.. I have math experience up to differential equations, but no real contact with physics, so I'm asking here. Given the situation in the picture: a mass suspended from a...
  48. J

    Soap Box car - heavier better ? Part II

    After reading throught the original thread about soapbox cars, I have a better understanding of what is happening. The soapbox derby that I'm in has few rules. You must have a 6" or less wheel, steering and some sort of brake. The hill is a constant slope and there is a 10' push zone. From...
  49. M

    Maximizing volume of a box without lagrange multipliers

    Homework Statement Show that the largest rectangular box having a fixed surface area must be a cube. Homework Equations ##V(x,y,z) = xyz## ##\sigma(x,y,z) = 2(xy + yz + zx) = C \in \mathbf{R}## The Attempt at a Solution As of this assignment, we haven't yet learned Lagrange...
  50. D

    Many Particle in a one dimensional box

    Hi pf, I am just wondering how would the system be if i keep say 5 particles in a 1-D box. How would the wave functions be? Will quantum superposition happen? Entanglement? What about the energy levels? How would they be quantized? In short i want to know how would you solve the...
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