Box Definition and 1000 Threads

Homework Statement How to solve question no. 35? Homework EquationsThe Attempt at a Solution Since the particle is spinless, spin = 0 , this means that the particle is a boson. Applying Bose - Einstein distribution function, ## f(E) = \frac1 { e^{\beta ( E - \mu)} -1}## I can get the value of...

Homework Statement A 100 kg box is to be held up by two support braces attached to a wall. One of the support braces makes a 27 degree angle with the wall and the other brace makes a 65 degree angle with the wall. Find the force in each of the support braces that will hold the box up...

Hi guys badly needed your help, i need to rotate the engine assy. with a mass of 500 kg using a steering wheel so i need to define what is the right gearbox, please be noted that it will be manually rotated by a person see attached drawing for your reference I'm hoping for your quick...

Homework Statement A force is applied to an initially stationary block of mass 2.65 kg that sits on a horizontal floor as shown. The 81.0 N force is applied at θ = 50° angle to the vertical. The coefficients of friction between the floor and the block are μs = 0.895 and μk = 0.665. What is the...

If I had a box with a bunch of particles in superpositions in it, what would I find if I found the mass of the box? First: Is it possible to have have box like this? If not what about theoretically. Second: Does weighing the box collapse the superposition of the particles? Third: Could I, by...

Homework Statement A block of mass m=1.5kg is attached to a spring of constant k=590N/m. It is initially at rest on inclined plane of 21 degrees, and coefficient of kinetic friction between block and plane is MUk=.19. In initial position, where spring is compressed by d=.18m, mass is at lowest...

Homework Statement We have an inclined plane with a mass ##M## and an angle ##\alpha## and a box of mass ##m## over it. Everything is at the instant 0 (it's a problem of static, no dynamics). a) What's the acceleration in the component x of the box? b) What's the acceleration in the component y...

Hello! I hope I'm in the right place for this questions. In short, I'm a musical instrument builder. I'm looking at placing a piece of wood above a closed resonator box. The box (also made out of wood) will have a hole in the top that is centered under the piece of wood. I know the material that...

Homework Statement A ionized gas (overall neutral) is in a cylindrical box with radius ##R## and ##h<<R##, with is main axis along ##\hat{z}## (there is acceleration of gravity ##\vec{g}=-g \hat{z}##). The ions are points: some of mass ##M## and charge ##q>0## (heavy positive ions) and some of...

I have some questions about scalar field Lagrangians, using the box notation defined as \Box \equiv \frac{\partial^2}{\partial t^2} - \nabla^2 . It's a basic, perhaps silly issue, but somehow I've managed to sweep it under the rug for a long time. So, usually, the Lagrangian of a free scalar...

Homework Statement A box sits on an inclined plank of 1.2m length by 0.6m vertical. The coefficient of friction is 0.40. If it is held at the top and released, what will be the velocity at the end of the plank? Homework Equations a=Fnet/m , C^2=a^2+b^2, v^2=u^2+2as The Attempt at a Solution...

Not sure if I'm doing this right would love input Consider a box m=50kg which is being pulled on a rough, horizontal surface by a person using a rope . Assume that the person is applying a force of T=150N on the block , the rope makes an angle of 30 degrees with the horizontal and the...

Homework Statement A box is given with a L = 1.414w and W = w and a cut size = x. Find the general formula for the maximum volume. Homework Equations L = 1.414w - 2x W = w - 2x H = x The Attempt at a Solution V = x(1.414w - 2x)(w - 2x) V = 4x3 - 4.818x2w + 1.414w2 Apparently this isn't the...

Can someone check if I'm doing this problem correctly? Please tell me if I did anything wrong. 1. Homework Statement A 12 g bullet passes horizontally through a 15 cm tall, 20 cm long .5 kg block which is initially at rest on a 1 meter tall table’s edge. The bullet is initially moving 230 m s...

Hello guys, I programmed a physics simulation where a particle with some initial conditions bounces off the walls of a 2d container. The simulation also includes gravity in the y-coordinates. The aim of the project is to produce a visual animation and further on include more particles and...

Homework Statement The board shown below is being held in equilibrium in the vertical plane by three smooth rods at A, B, and C Determine the magnitudes of forces at A, B, and C in terms of the weight of the body, W. Homework Equations Moment = f*r Here's a diagram The Attempt at a...

Consider the particle in a box problem. The number of energy eigenbasis is 'countable' infinity. But the number of position eigenbasis is 'uncountable' infinity. x can take any value from the interval [0,L] Whichever basis I choose, shouldn't the dimensionality of the vector space be the same?

I think the answer is incomplete, because proving that ##\psi(x)## isn't stationary doesn't prove that the particle isn't localised, it doesn't prove that ##\psi(x)\neq0## at ##0<x<\frac{a}{2}## at some later time. ##\psi(x)## could always be changing on the left side of the box (say from a...

Consider a particle in the ground state of a infinite well with sides at ##x=0## and ##x=a##. The ground-state energy ##E_1=\frac{\hbar^2\pi^2}{2ma^2}##. The energy of the particle is entirely kinetic. Hence, ##E_1=\frac{p^2}{2m}##. Solving for ##p##, we get ##p=\pm\frac{\hbar\pi}{a}##. So the...

I have an "unidimensional" box with two identical particles in. My question is , Does it matter in which total spin state is my total function? I mean , if it is a singlet or triplet , one is antisymmetrical and the other is symmetrical, but I only integrate the function in the spatial...

A shipping box is filled with pastry boxes. Each pastry box measures 1 cubic foot. The shipping box is 3 feet high. The bottom layer of the shipping box can fit 6 pastry boxes. What is the volume of the shipping box? Do I simply multiply 1 by 3 by 6 to get 18 cubic feet?

Hey all I just want to test your ideas on a box that is used for a dog sport. Simple way of explaining is that a dog will run down the lane over jumps and will trigger a box that holds a ball. But this box that is made out of wood and has a face plate that will be hit by the dog as the face...

Homework Statement A box of mass m is set on a merry-go-round of radius r with a linear speed v. The friction coefficient between surfaces is μ. Homework Equations ac = v²/r The Attempt at a Solution I imagined this problem because I'm trying to understand more deeply circular motions. I have...

Homework Statement A non-uniform box sits on two scales as seen below. Scale A reads 10.2N, and scale B reads 19.4N. Question: How far from the left end of the box is the center of mass located? Homework Equations τccw=τcw τ=f*d(from pivot point) The Attempt at a Solution If I choose the...

On an exam we just took, we were asked to find the dimension of a set using the box counting technique. So choose an epsilon, and cover your object in boxes of side length epsilon, and count the minimum number of boxes required to cover the object. Then use a smaller epsilon and and count the...

Suppose we have a classical particle in box. The number of degrees of freedom is 6. The position of the particle and its momenta. Now if we want to calculate the entropy of the system as a function of the energy we only need to find a relation between all the possible states the particle can be...

Hi Guys, I am trying to calculate the load transferred on the beams and then to the four supports (two under each beam) from a cargo (in this case say a box) to be stored in a yard. I have to check the suitable beam to be used and the load transferred to each support. Thanks in advance. :)

Homework Statement Vo = 5m/s W to the left = 6N Ffriction = 2N F to the left = W - Friction = 4 N m = 1kg g = 10 m/s^2 Ramp length = 10m sin a = 3/5 cos a = 4/5 Homework Equations F = ma Vt ^2 = Vo^2 + 2as Vt = Vo + at The Attempt at a Solution Outside force (1) to cancel acceleration from...

How do we solve the particle in a box (infinite potential well) problem using matrix mechanics rather that using Schrodingers Equation? Schrodingers Equation for this particular problem is a simple partial differential equation and is easy for me to follow. The solution has the following...

Homework Statement There is a resonance box with one end cloesd and the other end open. The box reinforces the sound of the tuning fork. That sound has frequency of 440 Hz sound velocity is 340 m/s a.) What is the basis of the phenomenon in question? b.) define the shortest possible length of...

Homework Statement The box's measurements are 277*120*195mm. The lamp's power is 15W. Trying to figure out how long it will take to heat the box so that it reaches a given temperature. According to Wikipedia ρair=1,2kg/m3 and cp air=1004J*K-1*kg-1 Homework Equations ΔU=m*cp*ΔTemperature E=p*Δt...

So in isolating a system so that it is in superposition in a volume of space, why is it the inside of the box gains coherence and the outside doesn't? It seems to me either the inside and outside have non-symmetric properties, coherence is limited to a maxium volume or density of decoherent...

Can someone please help me solve this question below. 1. Homework Statement How much force is needed to push a 20 kg box across a floor at a constant speed of 0.5 m/s [forward] against a frictional resistance of 4 N? Homework Equations Fnet = m.a The Attempt at a Solution Since the velocity...

In this video,Prof.Leonard Susskind talks about Boltzmann box and the universe.He claims that we might live in a Boltzmann box,And explains why is time runs one way, etc. This video is taken 2013 and we are in 2017 , so what's the new ideas about it. Are we living in a Boltzmann box ? , Or...

i am making a custom size card box filled with stuff that i want to put on top of a shelf (the box is bigger than the shelf), assuming the weight of the object is distributed evenly in the card box, what percentage of the box surface area (bottom of the box) that i need to have on the surface of...

Homework Statement A 10 kg rubber box is resting on a concrete floor. A force of 200 N is then applied to this box in a horizontal direction. What is the magnitude of the friction force on the box? Homework Equations This is a question about applying Newton's laws so Fsmax = μs η and η = mg...

How would you find the friction of a box being pushed against a wall with a force of 200N and a weight of 100N?

Hi, I'm working on my thesis and I need to calibrate some gas sensors that I'm building. I need controlled conditions(temp, RH and a known gas concentration) in order to calibrate the sensors. I'd love to know some idea to make a sealed box in which I trace and vary those parameter. I've...

Homework Statement I have a red mystery box which contains a 20, 50, 100, and 200,000 ohm resistor (one of each and ONLY one.) There are three terminals on the box you can plug a voltmeter into... testing A-B I got 60k, testing A-C I got 140k, and testing B-C I get 120k ohms. So this is a bit...

Hey there, I am familiar with the mathematics of multi-particle systems, but have now moved on to trying to plot them. I was a little ambitious and thought I'd attempt to somehow plot energy eigenfunctions of two particles in a 2-D box. Obviously I immediately ran into the issue that there are...

1. The problem statement, all variables, and given/known data Suppose a block is suspended by two strings, one, T1, is anchored at 30 degrees to the horizon, the other, T2, at 60 degrees to the horizon. If the block weighs 100 kg, what is the tension in the two strings? Assume that: The...

Hello Everyone, For the particle in the 1D box of width ##L##, the time invariant Schrodinger equation is cast in the form of the Hamiltonian operator and automatically leads to the energy eigenfunctions $$\Psi(x) = \sqrt{\frac 2L} sin(n\pi x/L)$$ I know that these energy eigenfunctions...

Homework Statement I'm given that the energy of a particle in a rectangular box is the following: E =\frac{\hbar \pi^2}{2m}(\frac{n_x^2}{L_x^2}+\frac{n_y^2}{L_y^2}+\frac{n_z^2}{L_z^2}) I'm to show that if the length of the box is increased adiabatically and quasistatically from L_x to 8L_x...

I have minimal engineering knowledge. Air speed resistance is linear with surface area as is static pressure from a standing body. A box girder under pressure is not simple. The bone in a skull is a beam of 2 layers of cortex about 2mm thick with trabeculae connectors about 4mm. Surgical chisels...

Homework Statement Use the eigenfunction Ψ(x) =A'eikx + B'e-ikx rather than Ψ(x)=Asinkx + Bcoskx to apply the boundary conditions for the particle in a box. A. How do the boundary conditions restrict the acceptable choices for A’ and B’ and for k? B. Do these two functions give different...

Homework Statement Show that the possible resonance frequencies in a 3D box with side a are constant multiples of ##(l^2+m^2+n^2)^{1/2}##, where l, m and n are integers. Assume that the box with sides a is filled with a gas in which the speed of sound is constant. Hence show that the number of...

Homework Statement A 55.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300. A force of 156 N is applied to the box directed at an angle of 18.0 above the horizontal. Does the box move? Please help??The Attempt at a Solution 156...

Homework Statement A car (particle) with mass m = 1 t drives into a barrier with a height of 1 m and a thickness of 3 m. The kinetic energy shall be sufficient to get classically over a barrier with half of the height. Derive an equation for the tunnelling probability. What is the probability...

Hello, I am doing an experiment where I am using a UVC light (254 nm) to kill bacteria for a science fair project. Will putting the light bulb in a card board box be enough to make sure no light escapes? Should I use a reflective material on the inside of a box, like a foil? Thanks!

Homework Statement How much work is done by friction when a box with an apparent mass of 325kg moves horizontally across a floor with coefficient of friction of .33 and is pulled at 59.9 degree angle for 2.60 m? What is the force that is pulling the box? Homework Equations W=Fdcos@ (@= theta)...