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. P

    Particle in a Box: Energy Measurements and Probabilities Explained

    Homework Statement A particle is in an infinite square well extending from x = 0 to x = a. Its state is a linear combination of the two lowest energy states. Psi(x, t) = A(2 Psi1(x, t) + Psi2(x, t)) a) If a measurement of energy is made what are the possible results of the measurement...
  2. P

    Find the work done on a box on an inclined plane

    Homework Statement a constant force Fa of magnitude 85.0 N is applied to a 4.0 kg shoe box at angle φ = 53.0°, causing the box to move up a frictionless ramp at constant speed. How much work is done on the box by Fa when the box has moved through vertical distance h = 0.45 m? heres the...
  3. F

    Particle of mass m in a box of length L Quantum Mechanics

    [b]1. http://img10.imageshack.us/img10/8602/232cw.jpg /b][/URL] Homework Equations http://img199.imageshack.us/img199/484/232ag.jpg sorry about the insert pictures, i don't know how to type up the eqns easily The Attempt at a Solution Now I know that outside the box the schrodinger equation...
  4. H

    Shear forces and bending moments on a box barge, formulas

    Homework Statement I need to determine loading sequences for a box barge - I have lots of information on the actual question, which I can't put up here because I have not attempted this question. I am really after some advice as to where I can find the equations I need. My (merchant navy)...
  5. Cyrus

    Bloom Box: Amazing Energy Source

    [url]tEJhnvX36hc&NR=1[/youtube] This is very amazing!
  6. M

    Hanging box - radius, length, mass, speed

    Hanging box -- radius, length, mass, speed Homework Statement You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.490 kg suspended from the ceiling of the bus by a string of length 1.79 m is found to hang at rest relative to the bus...
  7. P

    Bloom Energy Box: Fuel-Free Power Source Explained

    Video: http://www.cbsnews.com/video/watch/?id=6228923n http://techcrunch.com/2010/02/22/bloom-energy-boxes/ I don't understand how it works. You still need fuel to use it, so what problem does it solve?
  8. D

    The Bloom Box: Could it Power Our Homes? | CBS 60 Minutes Report

    Did anyone see the 60 minutes piece on the Bloom Box that was on last night? Do you guys think that this is a viable option in the alternative energy? Do you think that this could actually power all of our homes in the next decade or so? Link to the report...
  9. D

    Particle in a one dimensional box: probability of observing px between p and dp

    Homework Statement Show that for a particle in a one dimensional box of length L, the probability of observing a value of p_x (recall \hat{p}_x is Hermitian and that \Psi is not an eigenfunction of \hat{p}_x) between p and dp is: \frac{4|N|^2 s^2}{L(s^2-b^2)^2}[1-(-1)^n \cos(bL)]dp where...
  10. M

    What speed should you push the box

    Homework Statement You and your friend Peter are putting new shingles on a roof pitched at 23degree . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.4 m away, asks you for the box of nails. Rather than carry the 2.3 kg box of nails...
  11. H

    Perturbation of Potential (Particle in a Box)

    Homework Statement Assume that the particle in the box is perturbed by a potential V_{1}(x) = x . Calculate the energy shift of the ground state and the first excited state in first-order perturbation theory. Homework Equations Unperturbed wave functions for the particle given by...
  12. A

    Box Acceleration with Multiple Forces

    Newton's forces on a box! Homework Statement Two 45 N forces and a 90 N force act on a hanging box as shown in the picture below. Will the box experience acceleration? 1. Yes; upward. 2. No; it is balanced. 3. Unable to determine without the angle. 4. Yes; downward. Homework...
  13. C

    Calculating x and y Components of a Force on a Block from Rope Pulling

    1. A rope is attached to a block. The rope pulls on the block with a force of 225 N, at an angle of 30 degrees to the horizontal (this force is equal to the tension in the rope). What is the x-component of the force on the block due to the rope? What is the y-component of the force on the...
  14. L

    Physics help please determining distance of box pushed

    Homework Statement A block has a mass of 20kg is at rest on the floor. This block is then pushed by a horizontal force of 8N across the floor. The final speed is 2 m/s. Determine the distance the box was pushed. Homework Equations Fnet=ma d=(t)(s) a=(chand in velocity)/(change in time)...
  15. K

    Gravitational Potential Energy of a box

    Homework Statement a 18.5 kg box is slid up a 5.6 m long ramp that makes an angle of 33 degrees with the floor. What is the gravitational potential energy of the box relative to the floor? m = 18.5 kg d = 5.6 m http://musr.physics.ubc.ca/~jess/symbols/Theta.gif = 33° PEg = ?Homework Equations...
  16. C

    Heat transfer from a steel box

    I have a heat source inside a steel box. I know the outside ambient air temp and the amount of heat the source puts of. How do I calculate the internal air temp of the box?
  17. D

    Box hanging from a rope, need to know the force.

    A 23 kg box hangs from a rope. What is the tension in the rope if the following are true? a)The box is at rest? b)The box moves up at a steady 5.0 m/s? c)The box has Vy = 5.0 m/s and is speeding up at 5.0 m/s^2? d)The box has Vy = 5.0 m/s and is slowing down at 5.0 m/s^2 I have...
  18. J

    Flux of vector field through box

    Homework Statement Consider the vector field \vec F=\frac{\vec r}{r^3} with \vec r =x\hat{i} +y\hat{j} +z\hat{k} Compute the flux of F out of the box 1\leq x \leq 2, 0\leq y \leq 1, 0\leq z \leq 1 Homework Equations I can't use the Gauss divergence theorem since the divergence of...
  19. S

    Probability of finding a particle in a 1D Box

    Homework Statement Determine the probability of finding a particle in a 1-D box of size L in a region of size 0.01L at the locations x = 0, 0.25L, 0.5L, 0.75L and L when it is in its ground state. As percentages Homework Equations \Psi(x)=\sqrt{\frac{2}{L}}sin(\frac{nxPI}{L})...
  20. E

    Box on a Frictionless Incline

    Homework Statement A 12 kg box is being held on a 23 degree frictionless incline. Find the box's equation once released. Homework Equations Net force=ma Fpull-Fparallel=ma The Attempt at a Solution 12kg x 9.8m/s = 117.6 N (Fpull-mgsin23)= ma sub. known values in...
  21. P

    Solving a Two-Terminal Black Box Circuit

    Homework Statement A two-terminal “black box” is known to contain an inductor L, a capacitor C, and a resistor R. On connecting a 1.5 V battery, 1.5 mA flows. When an AC voltage of 1V RMS at 60 Hz is connected, 10 mA RMS flows. As the frequency increases at a fixed 1 V RMS, the current...
  22. K

    Kinematics problem for a box

    Homework Statement A 95-kg box is sliding along a level floor with a vi of 15m/s. a) how large of a constant frictional force is needed to stop to box in a distance of 15m? b)What is the coefficent of friction between the box and the floor. Homework Equations I tried to use...
  23. S

    Box sliding on incline with friction

    Homework Statement How to find the uk of a box sliding down a hill with only an angle and acceleration Given: angle= 30 acceleration= 3.1 m/s2 Homework Equations 1. uk= fk/fn 2. f=ma The Attempt at a Solution i did the cosine of my angle but i am not sure that is the answer
  24. B

    What is the acceleration of the box?

    Homework Statement A student pulls a box of books on a smooth horizontal floor with a force of 138 N in a direction of 23.9° above the horizontal. If the mass of the box and the books is 51.6 kg, what is the acceleration of the box? A constant force of 2.2 N is required to drag a 49.2 kg...
  25. P

    Box sliding down frictionless incline

    Homework Statement A box initially at rest at the top of a frictionless ramp is allowed to slide to the bottom. At the bottom its speed is 4 m/s. Next, the box is again slid down the ramp, but this time it does not start from rest. It has an initial speed of 3 m/s at the top. How fast is it...
  26. G

    Was the particle in a box analogy a recent one?

    Did the 'particle in a box' calculations come about when all those famous quantum physicists were forumlating the basics of quantum mechanics? It's the first thing taught in nearly all qm courses, but when was it first considered/published?
  27. C

    Can a Man Inside a Box Move It?

    there is a box with wheels and man inside it.my teacher is said there is no way to man move the box while his inside. i said opposite. i know I am right but i can't prove. can you help me? sry for bad eng.(not my natural lang.)
  28. B

    Calculating the Weight of a 13.25 kg Box

    Homework Statement A 13.25 kg box rest on a table. What is the weight of the box? Homework Equations I know this is really easy, but how would I do this? The Attempt at a Solution
  29. H

    GSM Phone + Metal Box = Directional Reception Tester?

    I am with a search team who use Mobile Signal to guess the whereabout of missing persons. I was told that for 900MHz GSM Signal can go as far as 30km if weather permits. I know where the station "B" is, it is about 20km away from my current location "A". At "A", I can receive somewhat...
  30. G

    Understanding Friction Force: A 15.0kg Box

    Homework Statement A 15.0 kg box is released on a 30 degree incline and accelerates down the incline at .30 m/s^2. Find the firctiopn force impeding its motion. What is the coefficient of kinetic friction? Homework Equations simga F = ma Force of friction = MU F_N The Attempt at a...
  31. H

    Pressure change from one box to another

    Homework Statement A .25L box at 1PSI is inserted into a 1L box at 5psi. The .25L box has a leak. The pressure of the 1L box at t=2sec. is 4.8psi A) How long will it take for the Pressure in Box 1 to equal the pressure in Box 2. B) What is the size of the leak in Box 2? Homework...
  32. T

    Probability of finding particle in half of a box for a given state

    Basically this is easy stuff I'm doing but i'n not sure whether i made a mistake or my answer is actually correct physically. I'm solving the 1-dimensional TISE for a particle confined to a box -a<x<a. I found that the eigenfunctions for this particle in a box with periodic boundary...
  33. S

    Electron in a box - calculate the spring constant

    Homework Statement Electron in a box has 2 sequential energy levels of 1.5 eV and 2.1 eV Calculate the spring constant Homework Equations E[n]=n^2*E[0] Therefore, 2.1/1.5 = 1.4 = (6^2)/(5^2) and the quantum levels are 5 and 6 E[0] = (h^2)(pi^2)/2(m)(L^2) The Attempt at a Solution...
  34. L

    Box floating in a liquid and undergoing simple harmonic motion

    Homework Statement A box is floating in a liquid. It is pushed down then released to oscillate. How do I determine the period of this oscillation? No idea where to go with this one. Homework Equations The Attempt at a Solution
  35. D

    What is the probability of selecting a white ball from a box?

    Homework Statement A box has 10 bass, 6 are black and 4 are white. Three balls are removed from the box, color unknown. Find the probability that a fourth ball removed will be white. Homework Equations The Attempt at a Solution I got: \frac{4}{10} * \frac{3}{9} * \frac{2}{8} * \frac{1}{7}...
  36. M

    Virtual Machines: Do you have one ? Xen,VMware, Virtual Box

    Virtual Machines: Do you have one ? Xen,VMware, Virtual Box Hi ... all ...Do you have a virtual machine ? (XEN, VMware, VirtualBox, or any other ...) ... please give more info on how you are using it ? I''m trying to find out what are the different ways to use them ?... how are people...
  37. S

    Putting every element in a box

    If you were to put 1 atom every element in its elemental form in a box, what would be the resulting compounds? 1.) I know it's probably impossible. 2.) I don't mean highly radioactive elements (transuranium metals, francium, radon, astatine, etc.) 3.) I'm really only talking about some of...
  38. N

    Determine the dimensions of a rectangular box, open at the top

    Homework Statement Determine the dimensions of a rectangular box, open at the top, having volume 4 m3, and requiring the least amount of material for its construction. Use the second partials test. (Hint: Take advantage of the symmetry of the problem.) Homework Equations The...
  39. S

    How can I optimize my homework solutions for efficiency and accuracy?

    Homework Statement http://img7.imageshack.us/img7/1826/43544187.jpg Homework Equations The Attempt at a Solution whats wrong with my answers? everything looks right to me... :S
  40. B

    Finding the max volume of a box with an open lid

    I need help with this problem please. Finding the max volume of a box with an open lid. Using a 20 in by 20 inch sheet of cardboard and cutting out the corners. Equations i been using: Volume: Length*Width*height Area: L*W Perimeter: 2L+2W Can someone help me get started
  41. S

    Einstein's box of phonons and energy-mass equivalence

    If Einstein's box (http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html ) is full of phonons instead of photons, the momentum is Mv=E/c' and time is t=L/c' where c' is the velocity of a phonon. The result should now be E=mc'^2 rather than E=mc^2. E=mc^2 is tenable to photons...
  42. S

    Einstein's box in media and mass-energy equivalence

    Einstein proposed a very simple derivation to E=mc^2 in 1940s which is well-known as Einstein’s box and a brief introduction is in http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html . If this event occurs in media instead of vacuum, the light speed should be u=c/n rather than c...
  43. T

    Sliding Box: Determining Distance Traveled with Newton's Laws

    Homework Statement A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.18 and the push imparts an initial speed of 4.1 m/s? Homework Equations MG of the object = mass * 9.8 Friction = mg * 0.18 The...
  44. Q

    I'm off by sqrt(2) and it's driving me crazy (expanded particle in 1D box)

    Homework Statement I believe this is a pretty standard question. A particle is initially in the ground state of a box of length L. Suddenly, the box expands symmetrically to twice its size, without disturbing the wavefunction. Show that the probability of finding the particle in the ground...
  45. D

    Calculating Width of One-Dimensional Box for Photon Emission

    Homework Statement When a hydrogen atom undergoes a transition from the n=2 state to the n=1 level, a photon with \lambda=122nm is emitted. a)If the atom is modeled as an electron in a one-dimensional box, what is the width of the box in order for the n=2 to n=1 transition to correspond...
  46. T

    What is the work done by friction on a sliding box?

    1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...
  47. T

    Forces and velocities of a sliding box

    1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...
  48. O

    Forces and velocities of a box

    a box of mass 12-kg slides at a speed of 10m/s across a smooth level floor, where it enters a rough portion 3 m in length. in the rough portion, the box experiences a horizontal frictional force of 72N. a) How much work is done by the frictional force? b) what is the velocity of the box...
  49. 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...
  50. 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...
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