Box Definition and 1000 Threads

Homework Statement Man pushes a box that is 11.2 kg on a horizontal surface at a constant speed of 3.5 m/s2. Where μ is .20 a)What is the horizontal force rthat teh man must apply to maintain teh motion b)If the force of part a is removed, how far does the box slide before coming to rest...

Homework Statement Newtons third law tells that if you push a box with 15N force, it pushes back on you with 15N force. How can you ever accelerate this box if it always pushes back with the same force you exert on it? explain briefly

Static Equilibrium/Torque--Calculating the force required to tip a box Homework Statement A uniform crate with a mass of 13.2 kg rests on a floor with a coefficient of static friction equal to 0.536. The crate is a uniform cube with sides 1.21 m in length. (a) What horizontal force applied...

Homework Statement Calculate the probability that an electron will be found (a) between x = 0.1 and 0.2 nm, (b) between 4.9 and 5.2 nm in a box of length L = 10 nm when its wavefunction is psi = (2/L)^1/2 sin(2*pi*x/L). Homework Equations As far as I know, only the normalization equation...

2 boxes are stacked vertically, box A on top with box B below. Mass of box A is 15kg. Mass of box B is 30kg. There is friction between all surfaces; static coefficient of 0.40, and kinetic coefficient of 0.35. The blocks are stationary when the constant force F is applied to box B (bottom box)...

Homework Statement A box is placed on an inclined plane of angle \theta. There is no fiction between the box and the plane nor between the inclined plane and the floor. The mass of the box is m_1 and the mass of the inclined plane is m_2 . Find the acceleration of the box and that of...

Homework Statement We have a 2-dimensional box with only one side at a potential V0. The other 3 sides are grounded. The box is a square with top and bottom at y=a/2 and –a/2 and sides at x=±a/2. Find V(x,y) (it should contain cos and sinh). Homework Equations The Attempt at a...

Hey all, I was wondering about a box that is sliding down what is basically a half pipe. There are 3 ramps, and I can get the correct sliding on the first ramp, but I can't figure out how to make it move to the next ramp. I am posting my physics code if anyone is interested...

Homework Statement A 75 kg box slides down a 25 degree ramp with an acceleration of 3.60 m/s/s Find the coefficient of kinetic friction (I'll use "uk") between the box and the ramp. Find the acceleration for a 175 kg box. Homework Equations F=ma Fg= mXg (g=9.81 m/s/s in my...

Homework Statement A 24 kg box is being pushed across the floor by a constant force ‹ 107, 0, 0 › N. The coefficient of kinetic friction for the table and box is 0.18. At t = 8.0 s the box is at location ‹ 11, 2, −4 › m, traveling with velocity ‹ 5, 0, 0 › m/s. What is its position and...

1. this is for a particle in a box (infinite potential well): For the wave functions calculate (as a function of n) \Deltax \Deltap \Deltax\Deltap Homework Equations h = h bar below u+n(x)=(1/\sqrt{a} )cos((n-1/2)(pi)x/a) u-n(x)=(1/sqrt{a})sin(n(pi)x/a) E-n=h2/(2m)(n(pi)/a)2...

Hello people, I just joined up and I have just started to learn Physics by myself. I had originally taken Physics in high school but even though I did not get good marks I really enjoyed the concepts. I am now 28 and have completed a Honours BA in Geography and a Masters in Education. I want to...

Hello, I have constructed a Faraday box with alluminium sheets having holes on them. The problem is that the mains supply field is not canceled within this box. The box is about 50cmx50cm and hosts a number of electrodes and an electrical drive that moves these system of electrodes. I...

Hi, Cant understand this at all, even modeled the set up with lego but still can't fathom it! I can't see how the arm can rotate with locking something. Cheers

Homework Statement A box of mass 20.00kg placed on a frictionless surface is pulled by two horizontal forces in the plane of the floor, as shown below. Determine the following quantities. a) acceleration vector. b) magnitude of resultant acceleration and its angle with the x-axis...

[SIZE="2"]hello i want buy gearbox for increase the speed i know that worm gearbox cannot use for increase the speed..just for reduce speed what is the type of gearbox can i use for increasing the speed there is gearbox types - Bevel Gearbox - Helical Gearbox - Planetary Gearbox - Sequential...

Homework Statement A rectangular box at rest in S' has sides a'=2m, b'=2m, c'=4m. The side c' is parallel to z' axis of S'; the side b' forms an angle 45deg with x' axis of S'. S' moves with v=0.5c with respec to S, along its x axis. Find the volume of the box in S and S'. Homework...

Hi, This is my first equation that I need to solve and both my textbook and professor have not shown me how to do it. I'm in chemistry and there isn't a prerequisite for calculus so I was wondering if I could be shown a way to solve this problem without doing calculus but if there isn't a way...

Homework Statement Ok this is from a summer assignment that I had for calculus yet it's not calculus but it was graded by my calculus teacher so maybe there's something she knows that I don't from a calculus standpoint that allowed her to mark me wrong for this so here we go... Write a...

If I have a heat source on for a one hour period inside an adiabatically sealed box, such as a 10,000 watt light bulb turned on for an hour, and simultaneously I have a fan on that constantly circulates the air inside the box, would a temperature probe measure a lower temperature due to the...

Homework Statement A system of 20 neutrons are confined in the region 0<x<3L 0<y<L 0<z<2L With L=10^{-15}m If each eigenstate can accept 2 neutrons (corresponding to the 2 possible spin states) what is the total kinetic energy of the system? Homework Equations I found the...

Hi, I have been given the following problem; If an electron is confined to a 1-D potential well of infinite barrier height and width L, the normalized wavefunction Psi(x) of the electron in the various quantized states, n, is given as Psin(x)=(2/L)0.5 sin(n pi x / L). For the n=2 state...

Homework Statement 2 different types of components in a black box, which might be 2 of the following, resistor, capacitor or inductor. they can be in parallel or series. 2 tests: 1. DC voltage = 0.01 ohm 2. fixed 1V AC RMS to the input and f=10Hz, I=75mA f=100Hz, I=20.9mA...

Hello. I have recently been introduced to the concept of electrons as standing waves around the atomic nucleus. The explanation I read used the simulation of "a particle in a tube" to give a monodimensional interpretation of how the standing wave behaves. Within an atom, what serves as the...

Homework Statement You and a friend have just loaded a 200 kg crate filled with priceless art objects into the back of a 2000 kg truck. As you press down on the accelerator, force F(surface on truck) propels the truck forward. To keep things simple, call this Ft. What is the maximum...

Hey all: I am taking a Thermodynamics course and we are studying work and heat through surfaces (i.e. conduction, convection, and radiation). I was given an assignment and I am having trouble arriving at the correct answer. I have scanned the question and the works I have so far. I hope...

A particle is moving in a 1D box with infinitely high walls. The potential is zero inside and infinite outside. What will happen if one of the walls is suddenly removed??

Homework Statement A box with a square base is to have an open top. The area of the material in the box is 60 sr in. What are the dimensions when the volume is maximized? Homework Equations The Attempt at a Solution A=x2+4xy V=x2y x2+4xy=60 4xy=60-x2 y=(60-x2)/4x Where do...

Our design lecturer require us to come out with a black box which can differentiate between raw egg and hard-boiled egg. On the black box, there should be one inlet and two outlets (one for raw, the other for hard-boiled).Dimension constraints of the black box is 500mm x 500mm x 500mm. The power...

From Box 3.3, p. 85: Since S^{\alpha}_{\phantom{\alpha}\beta\gamma} = S(\omega^\alpha, e_\beta, e_\gamma) and since [SIZE="4"]S=S^{\alpha}_{\phantom{\alpha}\beta\gamma}e_\alpha\otimes\omega^\beta\otimes\omega^\gamma is it then true that [SIZE="4"]S=S(\omega^\alpha, e_\beta...

It is said that if you add photons into a box and close it, the weight of the box will be increased. My question is: How? Photons are understood to be massless, which is what allows them to travel at c. But, when photons are absorbed by a material body, they do add mass to that body. Now...

In the thread for my post of "The Boys Puzzle", D H, a PF Mentor, wisely mentions the Monte Hall problem as an example of the type of puzzle that people have difficulty dealing with. That is indeed the case. For example, here is a slight modification of that Monte Hall puzzle that has been...

Hello everyone! To start things off, I apologize if this thread does not go here. Today I had a test on Energy (Potential, Kinetic, Elastic) and we had a question which asked us to find out the value of k for a spring. The question was centered around a box hanging from a ceiling via a spring...

I have a user-defined function that doesn't seem to work with NMinimum, FindMinimum, or any of the other optimization commands. I think this is due to the fact that the function uses elliptic integrals and matricies to obtain an output. It has multiple variables, but I want to keep them all...

There is a perfect box with with no gaps or cracks, with mirrors on the interior walls of the box. There is also a light bulb which can emit light but reflects any that goes upon it (with a super two-way mirrored surface, perhaps?). If one switches the lightbulb on, then there is light in the...

If you could build a box with a reflective inside that no light could escape. If somehow you put a laser in the box and fired the beam and then shut off the laser what would happen? Would the beam continued to bounce off of the insides of the box or would the beam dissipate somehow? If it does...

I'm new to the field of quantum mechanics and I have got this basic doubt. The position of the particle in a box is defined by the sine curve. Any position on a sine curve requires 2 coordinates to get the location of the particle having the highest probability at any point of time. But why...

Homework Statement A man picks up a 10kg box, and holds it at a height of 1m above the horizontal ground as he walks to a ramp, and then carries the box up the ramp to a height of 4m, and then down the ramp as shown, finally placing it on the ground at F. Describe the work done at each...

Hi everybody,i'm worried about some calculation. I have to write down the amplitude for the neutral Kaon oscillation. There are two Box diagrams which are depicted here: http://upload.wikimedia.org/wikipedia/de/9/92/FeynmanKaon.png The two diagrams come along with a combinatorical factor of...

Homework Statement A particle is moving in a one dimensional box of infinite height of width 10 Angstroms. Calculate the probability of finding the particle within an interval of 1 Angstrom at the centre of the box, when it is in its state of least energy. Homework Equations \psi...

Homework Statement A 100kg box is placed on a ramp. As part of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15 degrees. What is the coefficient of static friction between the box and the ramp? Homework Equations Fn = mg-Fsin15 The...

Homework Statement The diagram shows a box that has six faces .The top and bottom faces are square . THe other faces are all identical. What is the volume of the box ? Homework Equations The Attempt at a Solution

You need to move a 500 N box across the floor. You pull on the box with a rope which is also horizontal. The floor is not frictionless. You move the box so that it moves with a constant v of 3m/s by applying a 200 N force. Coefficient of Friction? Also, same question except pull the...

Why does clear tape (used to tape up cardboard boxes) become increasingly harder to tear along the axis that it is stretched? It seems that after a certain amount of deformation, it becomes nearly impossible to tear. This seems to be different then just the restoring force (as opposed to...

I have built these before, but have forgotten how I did it. I am making a battery box with four 12v batteries (7.5 Ah each). I will have only one pair of output terminals, one + and one -. Inside will be a switch to toggle between 12 and 24v. I do remember that in the 12v position all batteries...

So I am taking intro to stats and probability and I am having trouble understanding something that may be quite difficult to explain in counting. Let me start by telling you what i understand The choose function i.e (6 C 2) will take six elements and create a SET of 15 TUPLE's, in which...

The owner of a warehouse ask an engineer to design a ramp which will reduce the force necessary to lift boxes to the top of a 1/2 m step. If there is only room enough for a 4 m ramp, what is the maximum factor by which the lifting force could be reduced? I am not sure how to find the...

Can i use box muller transform to generate a distribution with two different sigma (i.e. sigma_x and sigma_y)? I want to generate a random gaussian angle (C) relative to z axis on circle plane, then set the angle relative to the x, A and y axis, B, wrt to the original angle. However, I want...

What is box normalizing and why is it important in quantum mechanical problems such as the black body radiation?

Homework Statement A student pulled a box of books weighing 68kg by a rope at an angle of 58 degrees above the horizontal plane of the floor. The floor has a coefficient of kinetic friction of µk=.27. What is the acceleration of the box of books? Homework Equations ∑F = ma Force...