Box Definition and 1000 Threads

Homework Statement What force one need to push the box with mass ##m_1## for the box with mass ##m_2## to jump when the force disappears? Homework Equations Newton's second law. The Attempt at a Solution System, when the force is applied: System, when the force disappears: ##F## is the...

Homework Statement Homework EquationsThe Attempt at a Solution a) The schrödinger equation $$i \hbar \frac {\partial \Psi}{\partial t} = - \frac {\hbar^{2}}{2m} \nabla^{2} \psi + V \psi $$ For the case ##0 \le x,y,z \le a##, ##V = 0## $$i \hbar \frac {\partial \Psi}{\partial t} = - \frac...

I just want to know the correct mathematical workings of why the box will tip over when distance x of the normal force from the center line is b/2. what I know is when $\sum M$ about the point of application of the normal force is zero, the box will not tip over. so, mathematically...

I am trying to calculate the density of energy states in a two dimensional box. The way my professor did this is by first calculating the amount of states with their energy less than some energy e and taking its derivative with respect to e. In order to see how many energy states there are with...

kreil submitted a new PF Insights post Visualizing the 2-D Particle in a Box Continue reading the Original PF Insights Post.

Homework Statement There are two forces on the 2.43 kg box in the overhead view of the figure but only one is shown. For F1 = 20.0 N, a = 11.4 m/s2, and θ = 33.0°, find the second force (a) in unit-vector notation and as (b) a magnitude and (c) a direction. (State the direction as a negative...

Hi 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. My attempt at a solution. I diagrammed the problem as in the file uploaded. To figure out the horizontal...

Lets suppose we have an object but we cannot tell anything about it.Energy,speed anything you can imagine.If there's no speed or energy,Is this means we can't tell object situation in physics Is that possible.Cause we have a object but we cannot describe the situation of it (I mean using...

Suppose you have a box with 10 balls, the 4 are red, the 5 are blue and the 1 is white. The probability of dragging each ball is 0.4~,~0.5~,~0.1 respectively. Now if I ask what is the probability of getting 3 balls in the order: red -> blue -> white, what is the right answer if balls are...

I was asked to draw a free body diagram to derive the equation tan θ = µs for the following situation: A box sliding down an inclined plane. My FBD has 3 forces - gravitational forces pointing downward (horizontally) <-- longest vector - normal force perpendicular to the box - frictional...

Homework Statement [/B] A uniform magnetic field exists in a cubic volume of space with a 50-mm side length. If the magnetic energy stored in this volume is 19J , what is the magnetic field magnitude? (This is all the information I got. Been a bad week for since it just seem information for my...

Suppose someone gives you a rectangular sheet of length a and width b (so b ≤ a). You make a topless box by cutting out a square with length x out of each corner and folding up the sides. How should you cut the sheet so as to maximize the volume of your box?

Imagine you have two boxes, each with a photon of equal frequency inside the boxes. The boxes, however, have different side lengths (yet, the boxes on their own are equal in mass). Wavelength of photon << Length of Box A < Length of Box B I've seen that a photon increases the mass of the...

Homework Statement weight of the box 10 kg on table at rest. Homework Equations deternmine weight of box and normal reaction acting on it. also determine w and Fn if force 40N pushes down the box. The Attempt at a Solution s i did like w=mg =NORMAL REACTION(R) and 40=10 * acceleration due to...

Homework Statement Homework EquationsThe Attempt at a Solution a) for ##0 \le x,y,z \le a##, the potential is zero. Therefore, the 3d schrödinger equation is $$ - \frac {\hbar^{2}}{2m} \nabla^{2} \psi = E \psi $$ Is it okay to write 3 equations $$ - \frac {\hbar^{2}}{2m} \frac {\partial^{2}...

Homework Statement A crate of mass 9.2 kg is pulled up a rough incline with an initial speed of 1.52 m/s. The pulling force is 110 N parallel to the incline, which makes an angle of 20.6° with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 4.94 m. (e)...

Homework Statement A ramp with an angle given by ø (from the horizon) and a box of mass represented by "m" with a given µ=0.55 between the ramp and the box, find the minimum (critical) ø for which the box will begin to move down the ramp. Wether µ is kinetic or static is not given in the...

Homework Statement Homework EquationsThe Attempt at a Solution Since this is discrete, I know the probability is equal to ##|a_{n}|^{2}##, hence the probability of observing ##E_{1}##, ##P(E_{1}) = \frac {9}{25}##, and ##P(E_{2}) = \frac {16}{25}##. However, I just sort of remembered this...

Hi, I have a problem understanding the particle in a box (V=0 inside, V=∞ outside), how is it possible that momentum can vary continuously while the energy spectrum is discrete? Aren't they related by E=p2/2m? What I am missing? Thanks!

Hello, In my problem I need to We are advised to create the Cooper pair box Hamiltonian in a matrix form in the charge basis for charge states from 0 to 5. Here is the Hamiltonian we are given H=E_C(n-n_g)^2 \left|n\right\rangle\left\langle...

I am not sure whether this question should go in Quantum Physics, Computers, or Linear Algebra. I am willing to see it moved if appropriate. In Nielsen and Chuang's "Quantum Computation and Quantum Information", in explaining quantum parallelism in section 1.4.2 (as a preparation for Deutsch's...

Homework Statement Homework Equations Fs = μ FN The Attempt at a Solution Ok, so I drew a free body diagram and tilted it 90 degrees so that Fg of the small box points right and Fstatic points left. Fg = 4.7 kg x 9.8m/s2 = 46 N we want Fs to equal 46 N , correct? so we use the formula Fs...

Homework Statement The 2.0 kg wood box in the figure slides down a vertical wood wall while you push on it at a 45 ∘angle. https://session.masteringphysics.com/problemAsset/1070374/4/06.P51.jpg Homework Equations ΣFY = FPY - mg The Attempt at a Solution I know that since there is a constant...

All that is visible to the human eye is that which can be seen at the furthest limits of the Cosmos, which began with the Big Bang. So then, what could exist from that point on? What space or material is the expanding Universe encroaching into, and either pushing it away, or transforming it into...

A box is 8 ft high, 4 ft deep, and 6 ft wide and weighs 270 lb. A worker pushes on the box at a location along the width and 5 ft above the floor. The coefficient of friction between the box and the floor is .53. 1) Determine what value of the pushing force, P, will cause sliding. 2) Determine...

So if you were to slide a box-like object down a straight ramp with a single gradient (its literally just an incline no curve). And you attempt to model it accurately would this be correct? Given the DE ma=mg-kv where a=dv/dt, mg=force of gravity, kv= force of friction Anyway my main question...

Homework Statement Homework Equations F = ma; f = µN The Attempt at a Solution Let F' be the action-reaction force between box m and box M f be the friction on small box m For small box m: F' = ma f - mg = 0 µF' - mg = 0 since f = µF' µma - mg = 0 since F' = ma a = g...

Homework Statement http://imgur.com/VwoDF58 Homework Equations How would I calculate the velocity the box gets off the ramp? I believe I need to use Vf = Vo + 2 a x a is gravity so it is -9.8, correct? but what do i put in as x? 5, which is the length of the ramp, or 4, the base, or 3 the...

Homework Statement We're given an unnormalized state function ψ(x) of an electron in a 1 dimensional box of length pi. The state function is a polynomial. We're asked to find the probability that a measurement of its energy would find it in the lowest possible energy state. Homework Equations...

Homework Statement You are helping your friend move, using a ramp to move boxes from the ground to the moving truck. You give a 26kg box a shove so it moves at 1.4mhttps://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngs at the bottom of the ramp. The angle that the ramp makes...

Homework Statement If a one-dimensional box is 1 nm long, what is the probability of finding the particle between the following limits? (a) x = 0 nm and x = 0.05 nm (b) x = 0.55 nm and x = 0.65 nm Homework Equations ψ = (2/L)½ sin(πx/L) The Attempt at a Solution (I do chemistry and I'm really...

How many energy eigenstates can "fit" inside a one-dimension box of length L?

Homework Statement A box of books that weighs 40N is dragged at a speed of 1.5 m/s across a rough floor. If the coefficient of friction between the floor and the box is 0.20, what is the rate at which heat energy is dissipated? Homework Equations Friction: f=μN Work: W=F*d Power: P=W/t The...

Homework Statement If the electric field is constant in direction (horizontal in the x direction) but its magnitude decreases from E1 to E2, determine the flux through a cubical box of side length L if four of the sides of the box are parallel to the field. Homework Equations ∫EdA = flux The...

Homework Statement A 1.0 kg box on a horizontal frictionless surface is accelerated by attaching a 1.5 kg mass as shown in the diagram. What is the magnitude of acceleration of the box?(Remember, both boxes accelerate.) Homework Equations F = ma The Attempt at a Solution I drew a free body...

Homework Statement Homework Equations ##F_{net} = ma## The Attempt at a Solution If ##m_2## accelerates, then the force on this box is ##m_1g## and its acceleration is ##\frac{m_1g}{m_2}##. If I disregard the presence of ##m_1## for a minute, I'll have to push on ##M## with a force such...

Hi i want to know how to make a 3D metal box whose length, width, and height i can change. For example, i have a box of 3 m x 3 m x 3 m. i should be able to extend any dimension by a maximum of 1 meter i.e 4 meter (say). I want to use this to store items whose size is unknown, but the limits of...

Ok I know this should be easy but it's been a few years since my physics lessons at college and I'm stumped. I work in packaging. I'm working on a tool that will tell me if a box will fall over when it is subjected to an edge drop test. That means that a block is placed under one edge of a box...

Homework Statement A UPS delivery man pushes a 5kg box (A) along a smooth surface where the coefficient of kinetic friction, [µ][/k], is equal to 0.20. The box slides for 1.5m before colliding with a 3kg box (B). The boxes then move together as one unit on a rough surface with [µ][/k]= 0.9 for...

Hi, I'm working on a problem that requires me to calculate thermal energy (kT) at different temperatures and compare those values to the lowest state energy of a particle in box (1D) of varying lengths. I've calculated the ground-state energies of the electron in all of these different sized...

Homework Statement Okay, so I am given an acceleration that I need to accelerate a box-thingy, along with a weight inside. Friction is included. I need to come up with a mass that is connected through a pulley to the box. This mass has to accelerate the box at the given acceleration. I am not...

Homework Statement A particle in two-dimensional infinite potential well $$ H=\frac{p^2}{2m}+\left\{\begin{matrix} 0, & |x|<\frac{a}{2}\text{ and }|y|<\frac{a}{2}\\ \infty , & \text{otherwise} \end{matrix}\right.$$ a) Find eigenfunctions and their energies. Also describe the degeneration of...

Im trying to construct a regular grid in a rectangular box in 3 dimensional space heres what i have to work with: x has a range between xmin and xmax y has a range beween ymin and ymax z has a range between zmin and zmax the total number of points is limited to a specific number n i want the...

Hi guys! Suppose there's a particle in a box, initially in its ground state. Suppose that one chooses a system of coordinates such that the potential V(x) is 0 from 0 to L. Suppose that one suddenly perturbate the system at a particular time so that V(x) becomes 0 from 0 to 2L. I've calculated...

Homework Statement A particle in a box of width 2a is in a state \psi=\frac{1}{\sqrt{2a}} for |x| less than or equal to a and 0 for |x| greater than a. What is the probability of finding the particle in [-b, b] inside the box? What is the probability of finding the particle with momentum p...

I've noticed that the example of a particle in a box is heavily used even for physical situations where there is no obvious box: for example when finding the degeneracy pressure in a neutron star one calculates the fermi-energy from a 3D-particle in a box. So I wondered: is there any good...

Hi, What are the convergent sequences in the box topology on R^ω?Are they the eventually constant only? Thank's in advance

Hi all, I'm new here, and I hope I'm doing this right. I mean posting where I should. Feel free to let me know. ;-) First, I'm a biologist but I'm a scientist and I'm interested in magnets recently. I read that magnetic field attract oxygen liquid (all over you tube) and also gaseous since...

Homework Statement A 500lb box is being pushed up a ramp which is sloped at 10 deg. The center of mass of the box is at the geometric center of the shown area. If the static coefficient of friction is 0.35 and the kinetic coefficient of friction is 0.28, what is the force P that will cause the...