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

    Box of primes over l V X a l ^2

    "box of primes" over l V X a l ^2 Homework Statement Find B, and t for these space curves (t = torsion) r(t) = (3sint)i + (3cost)j + 4tk Homework Equations Ok, so in my textbook i have two different equations to find the answer to this. the "box of primes" over l V X a l ^2...
  2. W

    Pulling on a rope attached to a box: Newton's Laws and Incline Planes

    Homework Statement A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 130.0 N at an angle of 15.0° above the horizontal. The box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and...
  3. 5

    Friction acting on box not slipping in truck

    Sorry for not using the proper post format. I'm typing on my phone and the post template doesn't show up. Question: a box is sitting in the back of a truck which accelerates forward when a traffic light turns green. Which of the following statements is correct if the boxdoes not slip? The...
  4. T

    Abstractly thinking outside the box

    I have very little background in physics and I only have basic calculus under my belt... but I can't seem to get this thought out of my head. There is no mathematical proofs here, no experimental evidence, not even any real evidence for theory, however I'd like to hear your thoughts on the...
  5. W

    Classically determining velocity of particle in a box

    Homework Statement I am supposed to show, using a classical argument, that the speed "v" of a particle in an infinite 1-D potential well is v= (nh)/(2mL) Homework Equations The Attempt at a Solution Doesn't the particle just reflect back and forth against the walls of the...
  6. G

    Energy State Probability Particle in a Box

    Homework Statement Show that the probability of obtaining En for a particle in a box with wave function \Psi(x) = \sqrt{\frac{30}{L^{5}}}(x)(L-x) for 0 < x < L and \Psi(x) = 0 for everywhere else is given by |cn|2 = 240/(n6\pi6)[1-(-1)n]2Homework Equations cn = \int\psi^{*}_{n}\Psi(x)dx...
  7. A

    What Causes the Differences in Newton's Law on an Inclined Plane?

    Suppose a box is sitting, motionless, on an inclined plane which makes an angle \theta with the horizontal. If I'm not mistaken, if one writes out Newton's law in the y direction (if +y is up), one gets N \cos \theta - mg = 0; i.e., N = mg \sec \theta. However, if you ROTATE the coordinate...
  8. A

    What is the net flux through the box?

    Homework Statement Vector V = <x2yz2, xy3z> 0<=x <=a 0 <= y <= b 0<= z <= c Homework Equations \intV \bullet \hat{n}dS In our case, this amounts \int\intV(either x or y component) dot \hat{i} or \hat{j} dA. The Attempt at a Solution Okay, I have tried to break apart the...
  9. N

    Vector Components In Box Problem

    Homework Statement I can't figure out how to start to find the components of these vectors! (see attached) It seems like there's not enough info :( What am I missing?! Homework Equations The Attempt at a Solution
  10. andrewkirk

    Particle in a box - why must wave function be continuous?

    I am teaching myself quantum mechanics and have just read the particle in a box explanation, which is the first derivation of a theoretical reason why only discrete energy levels are possible within certain bound scenarios. In Shankar, the argument uses a requirement that the wave function...
  11. S

    Dirac particle in a spherical potential box

    Hello, I'm studyng relativistic quantum mechanics by the book Relativistic quantum mechanics. Wave equations - Greiner, W. and I'm trying to derive the energy eingenvalues for s1/2 states, so I have the equation that I uploaded with the name eq1.jpg. In the text the author says, "If we assume R0...
  12. L

    Particle in box - Getting confused by formula

    In my book of formulas I have a formula for energy in different states, particle in box. E_n = \frac{n^2 \pi^2 \hbar^2}{2ma^2} So I should get Joule or something here right. A quick look at the formula. E_n = \frac{n^2 \pi^2 \hbar^2 [Js]}{2m[kg]a^2 [m^2]} \frac{ [Js]^2}{[kg]* [m^2]}...
  13. C

    What Forces Are Needed to Move a Box Up a Hill with and Without Friction?

    Homework Statement A 10kg Box is being pushed up a 3m long hill at the angle of 30 degrees. A constant force is being applied to the box parallel to the ramp. The box starts from rest. For questions a and b we can assume no friction. a) If you were to get the box to the top of the hill in...
  14. N

    Solving Quadratic Equation Using Box Factoring

    Homework Statement f(x)=6x^2+9x-6 Where does this function intersect the x-axis (i.e. what are the roots or zeroes of f(x))? Solve by factoring using the Box Method. When I use the method that is shown on this website http://www.purplemath.com/modules/factquad2.htm for this...
  15. S

    Product of compact sets compact in box topology?

    So Tychonoff theorem states products of compact sets are compact in the product topology. is this true for the box topology? counterexample?
  16. F

    Box sliding down a ramp question

    In order to get an appreciation for the time scales involved, think about a block that slides without friction down a ramp that is inclined at an angle q above the horizontal. Initially the block is at rest a distance s (measured along the plane) from the bottom. Click the button marked “DATA”...
  17. J

    Have a (home-built) linux box? Let's discuss (I want to build my own)

    Hey PF! Short First Post Intro: I've been a long time spectator here. I'm a junior undergrad physics major. PF has been a lot of fun, and tremendous help to me (like last winter I applied to many REU's). So thank you all! At the REU I'm in now, I'm learning linux. I'd love to hear any of...
  18. K

    Relative energies inside a rectangular box

    Homework Statement Consider a three dimensional rectangular infinite potential well with sides of length L, 2L and 3L. What is the energy of the first excited state relative to the energy of the ground state? The second state? The third? The fourth? Homework Equations...
  19. J

    Design of a mixing box of different gases

    Hi guys, I am designing a mixing box for different gases. Here is my plan: I will use Acrylic panels with the dimension of 30cm x 30cm x30cm. Two 3/4 inch pipes feed inflows at flow rate of 1300 LPM in total. The outlet is an rectangular opening of 8cm x 8cm. How can I define the pressure inside...
  20. F

    Gravitational effects on particles orbit in a box

    Hi all, If one were to consider a classical particle in a box of length L in Minkowski space then clearly the time taken to go between the walls of the box is L/v with v velocity. In the GR case with some metric coefficients A(r) and B(r) (spherically symmetric system, say) it's clear that...
  21. QuarkCharmer

    Optimization of box, varied material cost.

    Homework Statement Stewart Calculus 6E: 4.7 #14 A rectangular storage container with an open top is to have a volume of 10m³. The length of it's base is twice the width. Material for the base costs $10 per square meter. Material for the sides cost $6 per square meter. Find the cost of...
  22. T

    Future of a particle in a box - I'm fundamentally confused

    Future of a particle in a box -- I'm fundamentally confused Homework Statement A particle is somewhere in the right half of a one-dimensional infinite potential well with sides at x=-a/2 and x=a/2. The particle's wave function is constant over x, i.e. \psi(x) = \sqrt{2/a} for 0<x<a/2...
  23. T

    Work: Emptying a 2x1x1 box of water.

    Homework Statement How much work is required to empty a 2x1x1 ft box of water? Assume density of water is 62.5 lb/ft3. Homework Equations \int_a^b A(x)xdx A(x)=lw=2 The Attempt at a Solution 62.5\int_0^1 2xdx=125\left[ \frac{x^2}{2} \right]_0^1=62.5 Did I get it right?
  24. M

    Upgrade Your Woofer Box: How to Add LED Lights for a Unique Musical Experience

    So I built this really nice woofer box for my 6.5inch sub. All clear acrylic, and working on sealing and reinforcing the sides and back. My question is this: Given that I purchased a Dayton Audio 25W plate style woofer amplifier, is there any way I can hook this up so that I can plug a string...
  25. C

    Heat Loss From a Closed Box - Experimental Help

    Hi everyone. I am currently carrying out an experiment whereby I have a closed tank of water submerged in a larger tank. The water in the smaller box is heated and I am interested in the heat loss from the tank. I have done a rough theoretical calculation based on U values, where by I obtain...
  26. G

    Grade 12 Physics Lab (Material = Box of Matches)

    This is Grade 12 Physics lab assigned to me : Bonus: Performing the lab+making a conclusion to answer the research question. I thought whole day but can't think of any research question with box of matches. Could anyone please help me out with this?
  27. M

    Newton's third law and a box push

    Homework Statement I just don't understand how to describe how, if a person pushes on a box and the box exerts an exactly equal but opposite force on the person that the person is still able to move the box... Homework Equations n/a The Attempt at a Solution n/a
  28. O

    Designing Process for a Temperature Controlled Box

    Hey all! I am thinking of building a box in which the insides can be held a constant temperature. I would like to see if I can determine some parameters for the box. My first step is to determine heat loss through the box. I'm estimating that the largest difference in heat will be 101°C...
  29. A

    Thinking Outside The Box About Existence.

    I have been thinking out of the box and I have come to the conclusion that something cannot exist without consuming something else. I know this sounds really wacky (for want of a better phrase :)) which is why I posted this in the Quantum forum, lol. We know plants consume nutrients and use...
  30. M

    Shielding from electric/magnetic field using a metal box

    Can electric fields can be completely shielded using a metal box or metal sphere, please clarify the concept.
  31. S

    Heat / Smoke / Pressure in a confined box?

    Heat / Smoke / Pressure in a confined box?? I am a fireman with 15 years on the job. I am also an instructor at 2 different fire academies and within both my career agency as well as in my volunteer department. I often watch numerous videos and try to extract "teachable" moments. Recently I...
  32. H

    Length of a one-dimensional box with an electron inside

    Another student was asking me about how to calculate L in a one-dimensional box, given that an electron with a wavelength of 418nm moves from energy-level n=2 to energy-level n=4. Using, ΔE = Ef - Ei, I can say that ΔE = E4 - E2 = ((42 - 22) * h2 ) / (8mL2) Rearranging for L is simple...
  33. P

    Finding Speed of Box and Angular Speeds of Cylinder & Disk

    In the figure, the cylinder and pulley turn without friction about stationary horizontal axies. A rope of negligible mass is wrapped around the cylinder, passes over the pulley, and has a 3.00-kg box suspended from its free end. There is no slipping between the rope and the pulley surface. The...
  34. P

    The 3D modeler, newbie and odd questions box

    Hi I do 3D modeling and lately i have been trying to make some more theoretic diagrams about the whole thing. Sometimes i try to go through ways where math and geometry are needed (or so i think) and my background is not up to it. I'll use this thread to post some initial questions per post...
  35. Y

    Hypothesis testing for multivariate processes(ljung box white noise test)

    hi guys, I'm trying to understand how the critical value of Q-statistics is calculated in multivariate ljung-box test. or even more simply, in the univariate ljung-box test. initially i used MATLAB for hypothesis testing, MATLAB as an output furnishes the critical values, but the modules in...
  36. M

    How to Calculate the Box Counting Dimension in Chaos Theory?

    Box counting dimension! please help! Hi all, I am working on a problem from Chaos theory, I have to find the box counting dimension of the set {0}U{n^-p} where n is an integer and p>0. I started this problem by considering p=1. So, the set looks like {0,1,1/2,1/3,...}. If I take intervals...
  37. K

    Statistical mechanics - diatomic particles leaving and entering a box

    Homework Statement A box of volume .5m^3 contains air pressure 3*10^5 n/m^2, and air composition of 80% N2 and 20% O2. There is a small hole of area 1*10^6 m^2 in one face. The exterior of the box has air of the same composition and temperature but pressure of 1*10^5. How long will it...
  38. K

    Statistical mechanics and thermodynamics problem - pressure from in a box

    Homework Statement A box of volume .5m^3 contains air pressure 3*10^5 n/m^2, and air composition of 80% N2 and 20% O2. There is a small hole of area 1*10^6 m^2 in one face. The exterior of the box has air of the same composition and temperature but pressure of 1*10^5. How long will it...
  39. B

    Fnet=P-Pc=24-117.6=-93.6NFind Force Needed to Move 4kg Box in 3s

    Homework Statement A certain force moves a 4kg box from rest to a velocity of 6m/s in 3 seconds. If the coefficient of friction between the box and floor is 0.05, what is the magnitude of the force? m=4kg v0=0 v=6m/s t=3s μk=0.05 Homework Equations a=v/t F0=mg P=Ft P=mv The...
  40. E

    Particles with Spin in a Box - Energy Levels

    Homework Statement This is a two part problem. I think I am pretty close, but I'm quite understanding it. Which sucks because this is probably an extremely easy question.:frown: I have five particles in a box with S spin. I am to find the ground state of the five particles if they have...
  41. P

    Particle in a box wave function

    Homework Statement for a wave function confined between x=0 and x=L find an expression for A in order that the wave function be normalized The Attempt at a Solution for a particle in a box between 0 and L the normalized wave function is integral of C2sin2(n\pix/L).dx = 1 using trig...
  42. 0

    Work, Force, Acceleration, and speed of a box attached to a spring

    Homework Statement A 5.5kg box is attached to a spring which is attached to a wall. The box is subject to a force of 90N moving it from its equilibrium to a position 40cm away, the coefficient of kinetic friction is 0.300. a. what is the work done by the applied force over the 40 cm? b.what...
  43. M

    How to Connect Decade Resistance Boxes in Parallel and Series?

    We did a lab with decade resistance boxes. We had to set up three boxes of the same resistance in parallel. However, I am confused as to how to connect the cords. We used an ammeter to measure the current and a dc voltage machine. Can someone please show a diagram on how to hook up the boxes...
  44. M

    Spring attached to a box; descending a hill problems

    Homework Statement First Problem: A cyclist coasts down a 3 degree hill at a constant speed of 2.2 m/s. When the cyclist pumps hard, they can descend the hill at 12.6 m/s. Using the same power, what is the speed the cyclist can climb uphill? The cyclist and bicycle weigh 70 kg. Assume that...
  45. A

    Thermal energy of a gas in a box

    Homework Statement What are the factors that determines the thermal energy of a gas in a 3d object like a box Homework Equations The Attempt at a Solution I think thermal energy can be referred to as potential energy and also kinetic energy inside the box. If they are essentially...
  46. Z

    What are the essential components of a basic two-stage spur gearbox?

    excuse me,may someone list down all the gearbox components, i have some difficulties in finding all this..tq..
  47. N

    What Are the Energy Values and Probabilities for Two Particles in a 1D Box?

    Homework Statement If there are 2 particles of mass m1 and m2 in a one dimensional box of width a, I'm trying to find 1)what values will be found if the energy is measured, and with what probability these values will take occur. and 2) what is the probability of finding particle 1 with mass...
  48. N

    2 particles in a 1-dimensional box

    If there are 2 particles of mass m1 and m2 in a one dimensional box of width a, I'm trying to find 1)what values will be found if the energy is measured, and with what probability these values will take occur. and 2) what is the probability of finding particle 1 with mass m1 in the interval...
  49. S

    The box weighs 400lb and the person can pull with 200 lb of force.

    The box weighs 400lb and the person can pull with 200 lb of force. Will this person be able to raise the box? What is the maximum weight he can life using the pulley system? Sorry i couldn't figure out how to start. Appreciate any help, Thanks!
  50. J

    Finding the speed of a dropped block using energy conservation

    Homework Statement A 2.40 kg block is dropped onto a spring and platform of negligible mass. The block is released a distance of 5.00 m above the platform. When the block is momentarily at rest, the spring is compressed by 25.0 cm. Find the speed of the block when the compression of the spring...
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