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. M

    Need to calculate work -- Lifting and then sliding a box....

    Homework Statement To lift a box it needs 250N force (F). How much work (A) has to be done to lift it at height (h) 1.2m and to slide it horizontaly (l) 1.2m. Coefficient of friction is 0.2 (μ) F = 250N h = 1.2m l = 1.2m μ = 0.2 A = ? on both situations 2. Homework Equations A = F * h A = F *...
  2. Alan Ezra

    I Particle in a box and quantization of energy

    Greetings, In the scenario of a particle in an infinite potential well, there are discrete energy levels, i.e.##E=\hbar ^2 n^2 \pi ^2/ (2 m L^2)## where L is the width of the potential well, and n takes on positive integers. But what will happen if I put a particle of energy ##E_i## that is not...
  3. P

    Solve Black Box Circuits w/ Switch & w/o Switch

    Hi I'm experimenting with some black boxes and I'm trying to figure out what's their circuit. I can't seem to find what these two circuits could be.. Could someone please help me out? The purple crosses mark which ports are connected to the power source (6V). The yellow marks show how hard...
  4. N

    Distance between a box fan and a perforated plate

    I have a question about the relationship between fan CFM vs the distance it is installed away from a perforated wall. I did a simulation and it shows that keeping a distance between the two will make the fans have more CFM, less static pressure than the fans directly installed on the plate. If...
  5. Tibriel

    Will a sliding box fall over when it stops?

    Homework Statement Not an actual homework problem but a discussion that came up in class while we were learning about torque. A tall box is sliding across a surface with friction f, mass m, and velocity v. What equations would you use to figure out if the box would tip over while sliding to a...
  6. Specter

    Minimizing the surface area of an open box

    Homework Statement An open topped box with a square base has the capacity of ##32m^2##. Find the dimensions that will minimize the surface area of the box. Homework EquationsThe Attempt at a Solution I was told these are the dimensions, but I can't picture them in my head at all...
  7. jim mcnamara

    Why Are People Risking Their Lives for the Bird Box Challenge?

    https://techcrunch.com/2019/01/02/netflix-pleads-with-people-to-stop-doing-the-bird-box-challenge/ People are driving with their eyes covered, wearing blindfolds for tasks that will get them hurt. Call it the Bird Box meme if you like. I prefer marginal insanity as a better label. Sounds like...
  8. I

    I Particle in a box, boundary co-ordinate change

    If you have a particle in a 1-d box with a finite potential when ##0 < x < L ## and an infinite potential outside this region, then the normalised wavefunction used to describe said particle is ## \psi (x) = \sqrt{\frac{2}{L}}\sin(\frac{n\pi x}{L})##. However, if you had say instead a finite...
  9. A

    Physics — Net work on a box being pulled…

    Homework Statement How to calculate the net work Homework Equations A 5 kg box is pulled with a force F = 100 N for 5 m long inclined plane. The height of the inclined plane is 4 m and angle of inclination is 53^ a) What is a work done by force F? b) What is the work done normal force N? c)...
  10. T

    Two moving objects - box and cart

    Homework Statement We have a cart (It is very long) and a box on it.They are at first stationary but at ##t=0##, cart begins to move with ##v## such that: ##v = \alpha t^\beta ; t\leq t_0## and ##\dot v = c; t>t_0 ## where ##\alpha ,\beta ,c## are constants. At the time ##t1 (t_1<t_0)## the...
  11. H

    Design Gearbox #3: Get Help & Expert Advice

    Please help. I am design number 3.
  12. thariya

    A Quantization of the electric field inside a box

    Hello all, The second quantization of a general electromagnetic field assumes the energy density integration to be performed inside a box in 3D space. Someone mentioned to me recently that the physical significance of the actual volume used is that it should be chosen based on the detector used...
  13. K

    What is the smell from the new plastic storage box

    It's a tool storage box, probably made of PP (According to the label) When its lid opened, quite an obvious (but not very strong) smell coming out ,what it could be? vaporized form of plastic?
  14. A

    MHB Finding Squares in a Square Box: n > 1

    Determine all integers n> 1, for which in the square box of dimensions (n x n) you can enter different squares of integers, so that the sum of numbers in each row and in each column of the array is a square of an integer, and all the 2n sums are different.
  15. J

    Sizing a motor to spin a box which weighs about 600lbs

    Not sure if this is better suited for the electrical engineers or mechanical but I figured id post it up here to start. I am looking to size a motor that will spin a box which weighs about 600lbs. The motor needs to be in line with the boxes rotational axis. It needs to be able to rotate 360...
  16. YMMMA

    Describe what happens to a box attached to a pulley + spring

    Homework Statement The figure below shows a block attached to a pulley and a string. 1) which quantity has essentially the same nonzero value at all three points? 2) which quantity changes direction at point Z? 3)which quantity is zero at point Y?Homework Equations Restoring force = -kx...
  17. M

    Find the pressure put into a box by a hand-squeezed pump

    Homework Statement A spherical hand-held pump with a radius r is used to pump air into a cube with a length L. The pump and cube are connected together by rubber tubing. Express the pressure stored in the box as a function of the number of times the pump is fully squeezed. Imagine the...
  18. K

    Heat Buildup in Complete Insulation Box

    Supposed you have a box of size 1 square foot and the insulation is 100% efficient.. meaning there is no transfer of any heat outside.. and you put a lamp with glass surface temperature of say 50 Celsius (155 Fahrenheit). Would the air temperature in the box keep increasing... can it reach 1000...
  19. J

    Position wave function of energy eigenstates in 1D box

    Homework Statement Consider a particle which is confined in a one-dimensional box of size L, so that the position space wave function ψ(x) has to vanish at x = 0 and x = L. The energy operator is H = p2/2m + V (x), where the potential is V (x) = 0 for 0 < x < L, and V (x) = ∞ otherwise. Find...
  20. zehkari

    What is the minimum force at this angle that will move the box?

    Homework Statement [/B] 2. Homework Equations Fs = Nμ W = mg Fy = Fsin(θ) Fx = Fcos(θ) The Attempt at a Solution [/B] Hello all at PhysicsForums, I have a question on angled force and static friction. From my attempt below, I think I have found the maximum force required and would need...
  21. D

    Archimedes' principle -- Which box will sink first as we add coins....

    There are five empty box contains with the same weight. The upper side of each boxes are removed. These boxes are floating in a pool of water. Then to each box we put coins slowly one by one. Assuming the box does not tilt. Determine which of the following size of the box (p x l x t) can be...
  22. G

    Truck carrying a box, friction problem

    Homework Statement A truck (mass M) is carrying a box (mass m) in its flatbed, traveling along a straight, level road at speed v, when the driver sees a deer in the road a distance d ahead. The driver slams on the brakes to cause the truck to skid to a stop. The coefficient of kinetic friction...
  23. S

    Box on a conveyor belt (friction)

    Homework Statement A 10kg crate is placed on a horizontal conveyor belt. Draw a free-body diagram showing all the forces on the crate if the conveyer belt is speeding up.Homework Equations Its mastering physics says to "Draw the force vectors with their tails at the dot. The orientation of...
  24. TechTree

    Auto/Motor Finding a Drum for Motor Shaft to Lift 5kg Box

    Hello, I'm trying to use this gearbox motor as a winch to lift up a small box (5kg), however it needs to have some sort of drum that's mounted to the motor shaft to wrap the string around. Although I'm unable to find anything suitable that I could use. Is there already something that exists that...
  25. Fabrizio Vassallo

    Weight of a box with a flying bird

    Hello! This is my first post here, and I look forward to many more! This is a sort of riddle I was told today, and left me full of doubts. So, the 'puzzle' was the following: " There's a man carrying behind his truck an enclosed trailer full of birds inside it. All the birds are standing on...
  26. B

    B Photon Gas in a Box w/ Heat Conductor

    If I have a box evacuated of air with 5 of the sides mirors and one side a heat conductor. will the photon gas inside have photons that get absorbed by the heat conductor and re-emitted when the photons strike the heat conductor
  27. Migi Alarcon

    Find the weight of a box sliding on a floor....

    Homework Statement A force of 180 N is required to slide a loaded box along a horizontal floor. If the coefficient of friction is 0.32, what is the weight of the box? The Attempt at a Solution I'm not knowledgeable about any solutions able to retrieve the correct answer since the mass of the...
  28. A

    Friction problem (pushing a box)

    Homework Statement A person is pushing a box. The net external force on the 60 kg box is stated to be 90 N. If the force of friction opposing the motion is 30 N, what is the acceleration of the box? Homework Equations This seems to be a pretty easy, straightforward problem, but I'm confused...
  29. J

    Exploring the Effects of Magnetic Fields on Metal Boxes: What Happens Inside?

    Homework Statement Homework EquationsThe Attempt at a Solution I have honestly no idea about this concept . Book doesn't mention anything about this . This looks similar to Faraday cage in electrostatics . But I don't understand how this works in case of magnetic fields . Is this related to...
  30. oobgular

    Pressure in the corners of a box

    I have a fairly simple physics question, which I probably should know, but somehow I have never encountered it before. Suppose you have a pressurized cube, filled to a high uniform pressure P. Will the force from the pressure be larger at the edges and corners of the box? At the corner...
  31. isukatphysics69

    Find max distance box on hingedbeam can be before rope snaps

    Homework Statement Homework Equations torque = force * distance The Attempt at a Solution Torque forces : TForceTensionRopeY - TBOX - TBEAM = 0 Net forces Y: ∑FY = FTensionRopeY + FHingeY - WBEAM - WBOX = 0 Net forces X: ∑FX = FHingeX - FTensionRopeX = 0 This is my first torque problem...
  32. isukatphysics69

    Find the work done by the spring force on a box

    Homework Statement Homework EquationsThe Attempt at a Solution Wspring = ∫-k*xdx limits of integration are 12 and 0 So [0 - .12^2/2]*172 = -1.24J of force Getting 1.8/2 points for this anser
  33. Giulio Prisco

    I Einstein-Bohr "photon box" debate and general relativity

    I see this has been already discussed but the old threads are closed. EPR before EPR: a 1930 Einstein-Bohr thought experiment revisited "In this example, Einstein presents a paradox in QM suggesting that QM is inconsistent, while Bohr attempts to save consistency of QM by combining QM with the...
  34. K

    Calculating the frictional forces on a sliding box on a ramp

    Homework Statement We kick a box upwards a ramp. The box slides upwards, then slides backwards again. We ignore the air drag and other factors. We only look at the gravity, normal forces and friction forces. Forces on the box when it's moving upwards: Weight of the box is 0.123 KGs. Angle...
  35. D

    Mde decomposition of quantum field in a box

    Homework Statement I am considering the Klein Gordon Equation in a box with Dirichlet conditions (i.e., ##\hat{\phi}(x,t)|_{boundary} = 0 ##). 1-D functions that obey the Dirichlet condition on interval ##[0,L]## are of the form below (using the discrete Fourier sine transform) $$f(x) =...
  36. P

    A Compute Normal Forces on Box Sides via Stress-Energy Tensor

    Suppose one has a box moving through flat space-time with a stress energy tensor ##T^{ab}## that's non-zero inside the box and zero outside the box. How does one compute the normal forces on the faces of the box associated with it's motion? I am assuming that the normal forces are measured...
  37. FranciscoSili

    Partition Function of N particles in an assymetrical box

    Homework Statement Consider a gas sufficiently diluted containing N identical molecules of mass m in a box of dimensions Lx, Ly, Lz. Calculate the probability of finding the molecules in any of their quantum states. Calculate the energy of each quantum state εr, as a function of the quantum...
  38. BlackJ

    Need help on a work problem -- Pushing a shoe box up a ramp

    Homework Statement A constant force (Fa) of magnitude 82.0 N is applied to a 3.00 kg shoe box at an angle of 53.0 degrees, causing the box to move up a frictionless ramp at a constant speed. How much work is done on the box by Fa when the box has moved through a vertical distance h = 0.150 m...
  39. Aleoa

    I Perfect gas in a box with a piston

    We have a perfect gas in a closed box. On the top of the box there is a piston. We know that the molecules of the gas exert a pressure on the piston. Now let us put twice as many molecules in this tank, so as to double the density, and let them have the same speed, i.e., the same temperature. At...
  40. isukatphysics69

    Box lifted off the ground by a tension force at a 32 degree angle

    1. Homework Statement The magnitude of the force F is slowly increased. The direction of the force remains the same. What is the magnitude of the force F at the moment the block looses contact with the floor? Homework Equations fnet=m*a[/B]The Attempt at a Solution fnety =...
  41. K

    I Thought experiment: Photons in a box

    Consider a box whose walls are mirrors. Suppose we trap a bunch (yes, it's vague) of photons inside the box. They will not escape, or assume that a major part of them will not escape the box. Now suppose we have a way of decreasing the size of the box at our will, but possibly obeying the laws...
  42. K

    Probability Problem -- pulling colored balls from a box randomly

    Homework Statement Bob had a box containing 9 green balls and 1 white ball. A Bob's friend removed one ball from the box without telling Bob what was its color. Now what's the probability for Bob picking up one green ball from the box? Homework Equations [/B] Not aware of "formulas", I just...
  43. S

    Can viruses be stored in a box without decaying?

    I see no reason why it can't be done, can't find any information on it in google. I think of a virus like a lego piece, it does what it does due to its shape and material. I couldn't find anything in regards to a virus's self decay. If you shelve it in a container that isolates it away from EM...
  44. M

    Light Bulb in a Box: Velocity Change After Release of Photon?

    Homework Statement [/B] A box is traveling with a certain velocity in space. Inside the box is a light bulb, which is capable of releasing one photon of light. The light bulb harnesses the energy from the box; it does not require an outside power source but instead uses the energy on the...
  45. Pushoam

    Particle in a box quantum mechanics

    Homework Statement Homework EquationsThe Attempt at a Solution ## E \propto n^2 ## ## \frac { \Delta E} E = \frac { 2n +1} {n^2} ## In the limit of large quantum number, ## \frac { \Delta E} E = \frac { 2} {n} ##, option (a).
  46. Pushoam

    Force exerted by a particle in a box on the boundary

    Homework Statement Homework EquationsThe Attempt at a Solution The energy eigen - value of a particle in a box is given by ## E_n = \frac { n^2 h^2}{8mL^2} ## . Now, applying classical mechanics , ## \frac { p^2}{2m} = \frac { n^2 h^2}{8mL^2} ## . ## p \propto \frac { 1} L ## , So...
  47. T

    Particle in a box question in classical mechaincs

    Hi guys, I am having an issue with what my lecture is saying in these slides, I have attched my slides below. Here is my issue. I am very confused by the ##E<\Delta ## Beacuse I can't see how this has any momentum as it would produce an imagery number. And ye say that ##E<\Delta ## cannot...
  48. A

    I How long would it take for gas to leak out of a space box?

    I could not find an easy or believable source on this question on the internet. Anyway, if I had a box (volume V) in space full of gas (density N) and a hole suddenly appeared, how long would it take all of the air to completely leave the box out into space? I would assume the air would be at...
  49. M

    Newton's Third Law: Acceleration of box and worker

    Homework Statement On a horizontal frictionless floor, a worker of weight 0.900 kN pushes horizontally with a force of 0.200 kN on a box weighing 1.80 kN. As a result of this push, which statement could be true? A ) The box will not move because the push is less than its weight. B ) The worker...
  50. D

    Thermodynamics: box with a moving wall

    I have a doubt regarding the answer, a box separated by a movable wall has two compartments filled by a monotonic gas .Initially the volumes are equal but the pressure are 3P and P respectively .When the wall is allowed to move the final pressure is...
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