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. S

    Particle in a Box: Max Probability at x=xj

    Homework Statement Show that the probability of finding a particle p=\Psi^2 is at max at x=xj where xj=(2j+1/2n)a where j=0,1,2,3...n-1 and a is width of well Homework Equations p(x) = (2/a)sin^2((n*pi*x)/a) The Attempt at a Solution Im so confused I don't know where to...
  2. F

    Is holding a box over my head work, or not?

    I know that work=force*distance. So here's a scenario for you. Suppose I hold a heavy box over my head. I keep holding it until I get very tired and cannot keep it up. Naturally the box then falls to the ground at my feet. At that moment, the Earth's gravitational field performs work on...
  3. M

    Finding F on a box on an inclined plane

    Homework Statement A block weighing 87.5 N rests on a plane inclined at 25.0o to the horizontal. A force is applied to the object at 50.0o to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively...
  4. C

    Calculating Work Done for a Box on Horizontal Floor

    Homework Statement A box, whose weight is 182 kg, is drawn with constant speed 21 m along a horizontal concrete floor. The kinetic friction between the box and the floor is 0.58. (acceleration due to gravity, g = 9,81 m/s2). Homework Equations Calculate the work done when the box is drawn...
  5. B

    Particle in a box with non-flat bottom

    Homework Statement please see q attached.. Homework Equations The Attempt at a Solution Ok so I've shown that all the first order energy shifts are zero. I'm just not sure what the simple explanation for this is...? THanks!
  6. T

    Wave in particle in 1 box with infinite potential energy

    Homework Statement Q.1Why when the particle's kinetic energy is smaller, the wave has longer wavelength and higher amplitude? Q.2 Why the length of box decrease in ground state? <All in attachment> Homework Equations The Attempt at a Solution Q.1 wavenumber k=...
  7. P

    How Fast Should You Push the Box of Nails Down the Roof?

    Question: You and your friend Peter are putting new shingles on a roof pitched at 25 . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.5 away, asks you for the box of nails. Rather than carry the 2.0 box of nails down to Peter, you...
  8. P

    Understanding Acceleration on a Moving Incline

    "a block of mass m is sliding on a frictionless incline of 30 degrees. this incline has mass m and it has no friction with the ground. compute the acceleration for both objects." I'm having some conceptual trouble with this problem as it's been a while since my physics course and I've had...
  9. A

    A box being pulled at an angle

    Homework Statement A 45.0 kg box is pulled with a force of 205 N by a rope held at an angle of 46.5° to the horizontal. The velocity of the box increases from 1.00 m/s to 1.50 m/s in 2.50 s. Calculate a) Net force acting horizontally on the box b) Frictional force on the box c)...
  10. J

    Lifting a 7.5 kg Box: Power Calculations

    Homework Statement A 7.5 kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. a) If the box is being lifted at a constant speed of 2.0 m/s, what is the power delivered by the person pulling on the...
  11. R

    Box dragged along floor at an angle, calculating normal and frictional force

    Homework Statement A 60 kg box is dragged along a rough but level floor by a rope at a 30o angle to the horizontal. The tension in the rope is 150 N, and the box is speeding up at 0.80 m/s2 (along the floor). (a) How large is the frictional force of the floor on the box? Homework...
  12. A

    Solve Box on an Incline with Trig, Geom & Newtons Laws

    Homework Statement Homework Equations Trigonometry Geometry - Intersection on a Line Physics - Newtons Laws The Attempt at a Solution I am just lost. I move the Cartesian coordinates to the incline of the free body diagram to begin.I know that the normal force is perpendicular...
  13. A

    How Is Electric Flux Calculated Through a Nonuniform Field in a Box?

    Homework Statement A cubic cardboard box of side a = 0.440 m is placed so that its edges are parallel to the coordinate axes, as shown in the figure. There is NO net electric charge inside the box, but the space in and around the box is filled with a nonuniform electric field of the...
  14. O

    What is the Engineer's Magic Box?

    I figured this is the best place for asking this question. My apologies for those that find it inappropriate. I am looking for an image of the engineer's magic box for a powerpoint :(. If it has a proper name, please tell me. See the attachment for my MS Paint representation.
  15. DaveC426913

    Troubleshooting Network Connection Issues on a New XP Computer

    Just got a new computer. Has nothing on it but XP. Plugged a network cable into it and into my router. The network port is directly into the back of my computer, not into an add-on slot or anything. System does not detect any hardware. It does nothing. Shouldn't it detect the network? If...
  16. C

    Particle in 3D Box: Relation between Ω(E) and E

    Homework Statement For a system consiting of a single particle of mass m in a box of volume L^3 (Lx = Ly = Lz = L) develop a relation between the number of accessible states, Ω(E) and E Homework Equations E = ((π^2ћ^2)/(2mL^2))(nx^2 +ny2 +nz2) The Attempt at a Solution nx^2 +...
  17. R

    Dated box of dates, incline ramp, find normal force

    Homework Statement A dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of θ to the horizontal. The figure below gives, as a function of time t, the component vx of the box's velocity along an x-axis that extends directly up the ramp. (The vertical axis...
  18. C

    Convergence in the product and box topology

    Hi. Can I have some help in answering the following questions? Thank you. Let {f_n} be a sequence of functions from N(set of natural numbers) to R(real nos.) where f_n (s)=1/n if 1<=s<=n f_n (s)=0 if s>n. Define f:N to R by f(s)=0 for every s>=1...
  19. S

    Degeneracy in a rectangular box

    A particle is confined inside a rectangular box with sides of length a,a, and 2a. What is the energy of the first excited state? Is this state degenerate? If so, determine how many different wave fuctions have this energy. The relevant equations are E=Ex+Ey+Ez =((hbar^2*pi^2)/2m)...
  20. kreil

    Analyzing a Particle in a Box with 2D Space

    Homework Statement A box containing a particle is divided into right and left compartments by a thin partition. We describe the position of the particle with a 2D space with basis states |R> and |L> according to whether the particle is in the right or left compartment. Thus, a generic state is...
  21. T

    Force Needed to Push a Box on an Inclined Plane

    Homework Statement A man is pushing a box on top of a plane that is inclined 20 degrees above the horizontal, with a distance of 10 m. The weight of the box is 20 kg and the coefficient of kinetic friction is 0.30. The velocity is constant. How much force is exerted by the man? Find the work...
  22. F

    Velocity of qm particle in a box

    Can I draw conclusions from the curvature of a wavefunction on the kin. energy of the particle? For instance, the lowest bound solution of a particle in the box is a half of sinus: Psi(x) = sin(pi*x/L) Since the second deriv. of a wavefunction is proportional to the kin. energy, this would...
  23. I

    Please help: Normal force for box on an inclined plane = mg/cos(theta)?

    Homework Statement A box sits on an inclined plane. Given its mass and the angle of the incline, what is the magnitude of the normal force? Homework Equations I don't know- my understanding is N=mgcos(theta), but my physics textbook says otherwise... The Attempt at a Solution My attempt at...
  24. E

    What is the flux through side B of the box?

    Homework Statement http://i885.photobucket.com/albums/ac52/HummusNFalafel/showmepl.jpg A empty cardboard box is placed in an electric field pointing upwards with a strength of 1200 N/C as shown above. The bottom of the box is tilted up by an angle Θ = 13° from the horizontal. Side A of the...
  25. W

    Schrodingers Cat is sbserved whilst in the box

    When the cat is poisoned in its box then isn't that an observation? So when we open the box after an hour and see it dead it is the 2nd observation? I cannot see what this thought experiment proves at all BECAUSE an 'observation' was done or not done on the cat before the lid was opened. Its...
  26. R

    Photon in a massless mirrored box

    Suppose we have a photon bouncing around in a massless mirrored box - does this system have inertial and/or gravitational mass? To be more realistic, if we have a massive black body cavity at some temperature above absolute zero, will the inertial and/or gravitational mass be equal to the mass...
  27. K

    What Is the Compression of the Spring When the Box Reaches Maximum Speed?

    A 17.0 kg box slides 4.0 m down the frictionless ramp shown in the figure, then collides with a spring whose spring constant is 190 N/m. Picture: http://session.masteringphysics.com/problemAsset/1000077659/2/knight_Figure_10_69.jpg We also know: a) What is the maximum compression of...
  28. V

    Weight of a Box between two fluids of different densities

    Homework Statement A box with a height L, and a cross sectional Area A is floating between two fluids of densities p1 and p2. Determine the mass of the box using ho, h1, h2, p1, p2, and A. Homework Equations F= pVg The Attempt at a Solution In the file attached I drew my free...
  29. S

    Studying Emissivity Effects on a Copper Box Experiment"

    Homework Statement The experiment we did was pretty basic, it was a copper box with five different metal rods (unlagged and of equal lengths and diameter) welded onto the bottom, on the bottom of each were pins stuck with petroleum jelly. Hot water was then added to the box and the order at...
  30. M

    Azimuthal and Particle in a box equations

    Homework Statement Mathematically, the Azimuthal equation is the same differential equation as the one for a particle in a box. But \Phi(\phi) for m_l = 0 , is a constant and is allowed, whereas such a constant wave function is not allowed for a particle in a box. What physics accounts for...
  31. H

    Particle in a 2D Box: Min Energy & Lowest Energies

    Homework Statement It can be shown that the allowed energies of a particle of mass m in a two dimensional square box of side L are E =h2(n2+m2)/8mL2 The energy depends on two quantum numbers, n and m, both of which must have an integer value 1, 2, 3... What is the minumum energy for a...
  32. Z

    Maximum Volume of a Box: How to Optimize Cardboard Usage for Chocolate Boxes

    Homework Statement Chocolate Box Company is going to make open-topped boxes out of 5 × 14-inch rectangles of cardboard by cutting squares out of the corners and folding up the sides. What is the largest volume box it can make this way? (Round your answer to the nearest tenth.)...
  33. M

    Solve Logic Box Question: Apples, Oranges, Apples & Oranges

    Homework Statement If there were three boxes, one box is made of apples, the other is made of organes, and the last is made of organes and apples. You are able to open only one box without looking in, and you are able to look at only one fruit inside the box. By looking at the fruit, how can...
  34. O

    Static frictions and moving boxes on top of a box

    Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/d77fab7d-ece6-4c9c-be65-bf41f94770fd Homework Equations I got the right answers doing the work shown, but I don't understand the logic of how I solved question 4. The Attempt at a Solution
  35. P

    Spring system inside an accelerating box

    Homework Statement A mass m is resting at equilibrium suspended from a vertical spring of natural length L and spring constant K inside a box. The box begins accelerating upward with acceleration a. How much closer does the equilibrium position of the mass move to the bottom of the box...
  36. M

    Solving Square Box Reactor Question: Flux General Equation

    Iam trying to work out question related to sequare box, my question is what the flux general equation for the sequare box? I work it out and found it is flux=Acos(pi*x/a)cos(pi*y/a)cos(pi*z/a) where a is side lenght, am i right
  37. S

    Axial vibration on gear box and motor

    I have a motor driving a gearbox. I had DE bearing of the gearbox replaced recently as pitting in the inner race was found. Before re coupling the two units, I had the motor vibration checked and found to have satisfactory vibration levels in horizontal, vertical and axial directions. After the...
  38. T

    Jumping in a Moving Box: Effects of Acceleration and Vacuum Conditions

    What if I am enclosed in a big box which initially has some air. It starts moving at a uniform speed of xKmph. Now suddenly , suppose the box becomes a vacuum. and I jump at the same instant. WHat happens? Will I land at the same place wrt to the box or will I smash the back? Now what about...
  39. N

    Two Bosons in a Box: Is it 2/3?

    Say we have a small box with two physically identical bosons in it. Is it true that if I partition the box in two equal parts, it's more likely (2/3 chance) I'll have both particles at the same side? (Note: classicaly there's "only" a 50% chance of them being together)
  40. H

    Wave Trapped in a Cubic Microwave Cavity: Calculating Lowest Frequency and Modes

    Homework Statement Consider a cubic microwave cavity one foot on a side. Call this length a for purposes of your calculation. Look for the lowest fre- quency a wave trapped in the cavity can have. How many different modes are there which have this frequency? Assume the surfaces of the cavity...
  41. C

    Parity - Particle In A Box (Infinite Potential)

    I am trying to work out the wavefunctions for a particle in a box between -a/2 and a/2.I have already gone through the solution for a box between 0 and a and got the solution \sqrt{\frac{2}{a}}sin(\frac{n\pi x}{a} )So I can see that for -a/2 to a/2 I have...
  42. A

    Which gearbox and coupling are suitable for reducing RPM in a generating unit?

    Hi, I have a elec generating unit. The shaft has a rpm of 15000. Need to reduce to 250-300rpm i.e. bring it down to generating elec at 50Hz. Could somebody suggest which gearbox is suitable for this application to reduce from high to low rpm. Also suggest which type of coupling has to be used...
  43. M

    Work-mechanical energy: box sliding

    Homework Statement In Figure 7-47a, a 1.7 N force is applied to a 5.6 kg block at a downward angle θ = 49° as the block moves rightward through 1.4 m across a frictionless floor. Find the speed vf of the block at the end of that distance if the block's initial velocity is (a) 0 and (b) 1.3...
  44. W

    Electron in a box, size of the box

    Homework Statement I have a test in my physics class on tuesday, and as a study guide, our professor gave us a sample test and the solutions. I worked through most of it, except for this one question. I don't understand his method to solving it, I was hoping you guys had a solution. I have...
  45. C

    Homework problem dealing with frictional forces when a box is inside of a truck

    Homework Statement A 30.0 kg packing case is initially at rest on the floor of a 1500 kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30 and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling...
  46. M

    Solving the Schrödinger Equation for Particle in a Box

    I have a problem: Let V0(x) denote the potential corresponding to the in nite square well (`box') extending from x = 0 to x = a . Let us replace it by the potential V (x) = 0 ; |x| \leq a/2 \infty; |x| \geq a/2 i want to fi nd the solutions of the Schrodinger equation associated...
  47. H

    Dropping the Ammunition Box: Physics Problem Explained

    Homework Statement A plane flying 125 m/s horizontally drops an amunition box. The box falls for 18.6 s before touching down on the ground. a) what height was dropped for the box. b)what is verticle velocity when it hits ground. c)how fast is traveling horizontally when hit ground...
  48. N

    What is the acceleration of the box?

    Help Please. :) Homework Statement A 20 KG box is dragged across a level floor with a force of 100 N. The force is applied at an angle of 40 degrees above the horizontal. If the coefficient of kinetic friction is .32, what is the acceleration of the box? Homework Equations ...Sorry...
  49. E

    Project: RF Transmitter in a metal box

    I have a question on my Junior Design project: My project will be going into a metal enclosure, but contains an RF transmitter with PCB antenna to allow it to be controlled from a USB port on a laptop. Our current plan is to make a 1"x1" glass opening to allow the signal to get out (2.4GHz, so...
  50. A

    Solving a Physics Problem: Net Work Done on a Box

    Homework Statement a box of mass 5.0 kg is accelerated from rest across a floor at a rate of 2.0m/s^2 for 7.0s. find the net work done on the box. Homework Equations f = ma w= fdcostheta The Attempt at a Solution f = ma f=10 w = fdcostheta w=10d w=10*v*t w=10*v*7...
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