Box Definition and 1000 Threads

Hi, I'm trying to prove a wave equation of particle in a box situation. In many solutions, they used a equation like Eq = Asin(kx)+Bcos(kx). Instead, I want to prove using Eq = Aexp(ikx) + Bexp(-ikx). So, this is my solution. However, the original (well-known) solution is without i. (psi =...

Apparently the answer is to have the jumper over the bucket. Am I wrong in thinking that the jumper transfers heat to the ice cream, why does it not do so? A similar question elsewhere was "Colin claims to have built a refrigerator alternative which works without any power supply. It is a box...

Given a force of tension with a string attached to the front of the box, do we take the force as acting with an angle to the centre of the mass of phi or theta? Explain please?

If I have a trolley and an object on top traveling at constant speed, the force on the object in the horizontal direction must be zero. In this case do we count there being no frictional force, or is it because the kinetic friction backwards and the static friction forwards sums up to zero? Is...

Does cardboard absorb or reflect UV from indirect sunlight? does it go through the cardboard and hit the plastic and rubber items inside the shoe box with UV?

hey guys need to know the way to find the solution to the problem. Consider a truck which is traveled in a speed of 60km per hour. A package weighs 50 kg is placed inside the truck with side supports to arrest the movement in x and y direction. But the top movement (z axis) is not arrested...

For the given problem, I know that the quantized energy for the particles in a 1D box is given by - E(n) = n^2 h^2/ (8mL^2) Here m = mass of electron L = Length of the box = a Now, since there are 8 electrons, but only 2 can occupy one energy level, so I used n^2 = (1)^2 + (2)^2 = 1 + 4 = 5...

For calculating minimum E, I have n = 1, L = 2a & ψ = 2. But I am not getting how to exactly find its value. Please help me !

https://apcentral.collegeboard.org/pdf/ap-2020exam-sample-questions-physics-c-mechanics.pdf For 1 b) how did they get that equation? Is it wrong?

I solved it using parallelogram law if vector addition but didn't got the correct answer.why? Is their any other way to add velocity vectors. How to do this problem

The eigen wavelengths λn(WL) of EM radiation in box are 2d/n where d is the size of the box. If I put a photon in a box with WL>2d via an optic cable trough a hole it must reflect on the perfect mirror walls and be a running wave. Maybe it is possible to decompose it as a set of eigenmodes of...

From the probability density plot why it is max at the centre of the box...e.g probability to find the particle per unit le gth is max. at the centre of the box??why not at any other position??

A chocolate company produces triangular chocolate bars. The length of the chocolate bar is x cm, and its cross section is an isosceles triangle. The length of the base side of the cross section is 3 cm, the height is h cm, and the two base angles are 50 degrees. Moreover, the company uses a...

I would like to know the considerations needed to find the tipping of a box. It is given μk=0.2 and the box is 50kg There are actually 2 ways of solving the problem: 1. To consider the moment about the centre of mass of the box, given that the normal force on the box will be redistributed...

I need help .I did not A) E < V0 for T =? (passing coefficient ) B) E = V0 for T = ? C ) E > V0 for T =? A

I'm trying to relate an analogy from Brian Greene about entropy microstates/macrostates to the real world. In the analogy, you have 100 coins that you flip. The microstate is which particular coins landed heads up. The macrostate is the total number of coins that are heads up. So a low entropy...

I first find the force of friction to be (2)(9.8)cos(65)(.22), then I find the pull of gravity to be (2)(9.8)sin(65). The full equation I set up to be: 0 = kx + force of friction minus the pull of gravity This gives me the wrong answer, 0.44 . My free-body diagram is that kx and force of...

Regarding the first part, I proceeded as: nx ny nz 4 0 0 => E1 = 16C 0 4 0 => E2 = 16C 0 0 4 => E3 = 16C 3 1 0 => E4 = 10C 3 0 1 => E5 = 10C 0 3 1 => E6 = 10C 1 3 0 => E7 = 10C 0 1 3 => E8 = 10C 1...

I have been trying a couple of problems with forces and i am not getting the answer, I don't understand what i am doing wrong. Can someone please guide me through this question

Consider the light sensor in a modern camera. Light can give energy to electrons and populate the numerous "boxes" of our light sensor with extra electrons. Those boxes will temporally store the electrons till they are counted. I would like to understand this process with my "Bohmian" glasses...

Hi everyone, this is my first message after presentation so please be merciful if the notation is somewhat messy. Here's my attempt at a solution: As for points 1) and 2) I used the definition of partition function $$Z = \frac{1}{h^{3N}} \int e^{-\beta \mathcal{H}} d^3p d^3q$$ and the fact that...

T = 2π * √(2/300), T = .513 seconds. If I divide it by 4/3, I get a final answer of .385 seconds of touch. I know the box isn't attached for the entire oscillation, so T has to be divided. To me, it makes sense to divide it by 4/3 (when the box falls, the spring is compressed, hits...

Hi, this is my try: I would appreciate any confirmation or correction . -- Thanks

I first wrote down that 55% = Eout/Ein I also know that W = (Facos20)(4) and I substitute it into the first equation 55% = Eout/[(Facos20)(4)] But I'm missing two variables here. Did i forget something or is the question missing some information?

Firstly, since there is no condition for the z axis in the definition of the potential can I assume that V(x,y,z) = .5mw^2z^2 when 0<x<a, 0<y<a AND -inf<z<inf? If so then drawing the potential I can see that the particle is trapped within a box with infinite height (if z is the...

I have read about many hot box apparatus made by guarded hot box method. My question is why do people do not make one where the hot side consists of a heated metal plate directly in contact with the material to be tested. For those who do not know about what a hot box apparatus is - It is a box...

Homework Statement: A box of mass M=30 kg sits on a ramp which is tilted at angle 13 degrees. The coefficients of static and kinetic friction between the box and the ramp are both 0.12. The box is connected to a spring of spring constant k=9 Newtons per meter. Initially, the box is held in...

Here is my attempt at a solution. The thing I am not sure about is the final result of the Shrodinger equation and the n-values that are offered? Did I make a math mistake? Thank you so much for reading through this!

Good morning, I have a system that consists of a huge number of boxes, it is not important to know how many, each containing a binary number: In every cell, the probability that there is a '1' is p, so the probability that there is a '0' is equal to (1-p). What I do is take them in groups of N...

We have a 2D box (billiard table) which have size of Width = 600 and Height = 300. We have two identical ball a radius of 20. Also the balls decelerate with a rate of 5 m/s^2. The problem is to find the position of the ball after 10 second. ( The balls may have collide) from math import...

Problem Statement: I am having trouble deriving the expression from the initial equations. (Calculate the emptying time considering Volume conservation) Relevant Equations: Q=A*sqrt(b(H-h(t)) And we have dh/dt =Q/S (conservation equation) and we have to obtain h/H = 1-(1-t/te)^2 with te=...

A steel washer is suspended inside an empty shipping crate from a light string attached to the top of the crate. The crate slides down a long ramp that is inclined at an angle of 37° above the horizontal. The crate has mass 180 kg. You are sitting inside the crate(with a flashlight); your mass...

unsure what process to tackle it.

My friend gave me a box of essential oils. It seems pretty wasteful to throw them out (and it's a gift), but I have no idea what to do with them. Scented soaps or perfumes would be a fun project, but I don't have the other ingredients to do that. So, I'm taking suggestions. (And what do I do...

I was reading the following article: https://en.wikipedia.org/wiki/Fictitious_force When I came across this passage: "This led Albert Einstein to wonder whether gravity was a fictitious force as well. He noted that a freefalling observer in a closed box would not be able to detect the force of...

Problem Statement: What is the minim Force F necessary to make the crate start moving up the incline? Relevant Equations: F_push=mgsin(ø)+F_f F_f= µ_s mgcos(ø) My values m = 80kg ø = 20 Fø = 15 static friction = 0,5 constant friction = 0,4 F _push = 80kg * 9.8 m/s^2 *sin(20) + 0,5 * 80kg *...

The multiplicity of states for a particle in a box is proportional to the product of the volume of the box and the surface area of momentum space. $$ \Omega = V_{volume}V_{momentum}$$ The surface area in momentum space is given by the equation: $$p^{2}_{x}+ {p}^{2}_{y}+{p}^{2}_{z} =...

In this problem I am supposed to treat the shelf as a weak perturbation. However it doesn't give us what the perturbed state H' is. At the step V(x) = Vo, but that is all that is given and isn't needed to determine H'. This isn't in a weak magnetic field so I wouldn't you use H'=qEx and then...

Area = 1 x 0.5= 0.5 1st moment of area = 0.5 x (0.5/2) = 0.125 m total force = p x g x 1 moment = 1000 x 9.81 x 0.125 = 1226.25N Force = 1226.25 im pretty sure all that is right i think the second moment = Ix = bh^3 / 3 = 1 x 0.5^3 / 3 = 0.0416 then 2nd moment of area / 1st moment of area...

Hello Got a following problem. 300N Box on a frictionless inclined plane. The plane itself is in the Z-direction. Box is held by a rope AB and a force in the direction Z. Determine the tension in the rope and the force F. The answers to this problem are 104N and 215NMy question is where do i...

Please find the attached drawing showing detail of my requirement. I need to lift a box on a wood table, which opens its lid while its lifted. I am able to make the box lifts upwards. Now my requirement is to get a proper solution to smoothly open the lid whole the box is lifted. The lifting...

I am having difficulties understanding this concept. Particle in a box (as far as i understood) shows that the electrons or particles need a certain about of potential energy to escape the one-dimentional potential well. I think its pretty similar to the concept of the electons and ionising...

I'm reading this Document : https://www.mathworks.com/help/physmod/sps/examples/current-transformer-saturation.html#d117e16073 In this document, it said : "Open the CT dialog box and observe how the CT parameters are specified" How to open CT dialog box in simulink ? Thanks for your help

I am trying to understand ergodic theory, i.e. how simple systems reach equilibrium. I consider a classical particle in a 2D (or 3D) box. Funnily, I have never seen this example in books (probably due to lack of knowledge). Instead, in QM, the particle in a box is a prototypical example. My...

Is there any experiments that validate the results of particle in a box with infinite or finite potential. Thanks

I have question, how can I solve problem of particle in rigid box when one of the wall gets completely destroyed? At time t = 0 the right wall of box gets completely destroyed, left wall is still here( ψ(0) = 0 ), also at t = 0 we know that particle is in ground state. How can I search for...

Homework Statement A thermally insulated, rigid vessel is divided into two equal compartments. One contains steam at 100 bar and 400 degrees Celcius, and the other is evacuated. The partition is removed. Calculate the resulting pressure and temperature. (Please let me know if this is the wrong...

Homework Statement A sealed, thermally insulated tank of volume 2 m^3 has a safe working pressure of 4 bar. At 20 degrees Celcius, 10% of the volume is occupied by water, the remainder by water vapour. Calculate how much heat can be added without exceeding the safe working pressure. This...