Box Definition and 1000 Threads

Homework Statement A cuboid of constant density, height h and length of bottom side=L is in the train. Determine the minimal necessary acceleration (of the train) needed for the cuboid to fall. There is no slipping. (that's all that is stated in the text) Homework Equations not...

Homework Statement A box is being pulled up a ramp with a force F. The ramp has a 30 degree incline with the horizontal. write the sum of the forces in the x direction and y direction. Make the x and y coordinate system be parallel and perpendicular with the ramp. The Attempt at a...

Homework Statement A 800 N box was pushed up an incline plane of length 4.0m (measured along the incline) to a window ledge 2.0m above ground level. This process required that 3200J of work be done. What was the average frictional force along the plane? Homework Equations W=Fd...

Homework Statement A horizontal 25 N pushing force acts on a 10 kg crate moving up a ramp. The ramp is inclined at 37 degrees above the horizontal. How much work is done by this force in moving the crate a distance of 15m along the ramp? Homework Equations W = Fd The Attempt at...

A 8 kg box slides d = 4.4 m down the frictionless ramp shown in Figure CP10.69, then collides with a spring whose spring constant is 250 N/m. At what compression of the spring does the box have its maximum velocity? i know that .5kx^2+.5mv^2=mg(d+x)sin theta...

Hello, my name is Eugene, i am glad i found a forum for people who love math. I was reading a book on mathematical puzzles recently, and there was one which i couldn't solve, mostly because i am not a very clever guy. Perhaps you will have some ideas? The area of the puzzle is non...

1. What is U(x)psin(x) in the interval 0 < x < L? (less than or equal to) 2. In previous problems I had found the following: Second deriv. of psi(x) = -(n*pi/L)2*C*sin(n*pi*x/L) U(x)*psin(x) = 0 3. From the above and the Shrodinger equation, I added U(x) = 0 to the second...

Hi guys, I got this thought in my head. If I have a box of mass x, being pulled towards East and the angle \theta, then force applied to the box in order to move it on the surface with friction coefficient \mu has to be in such a way: My question is... wouldn't N be: Or, N...

I know what this is SUPPOSED to do, but I have no diagram to show me how to hook up the *counts* 36 pins. Image attached. Is there any hope for me, doc?

1. A proton is confined within an atomic nucleus of diameter 3.80 fm. Estimate the smallest range of speeds you might find for a proton in the nucleus. 2. Uncertainty Principle 3. 3.80fm * mv = h/2 Soliving for h, using mass of proton = 1.67*10-27kg, I obtain v = 5.22*107. Then...

Homework Statement In the ABC msgbox I would like the variable 'score' to appear after 'Your score was'. How do I do this? Homework Equations %tells the user their overall tv knowledge score=A+B+C; title1='Your TV Knowledge'; if ((A+B+C)<=24)&&((A+B+C)>=18) ABC=msgbox('You are a...

Hi all, I'm trying to wire an 8 way fuse box for use as a power distribution block, but I'm having trouble with wiring the power properly. See the attachment for the circuit diagram. As you can see, the entire V+ side is tied together. Last year we used a fuse box that already had that...

Homework Statement consider butadiene H_2 C = CH-CH=cH_2 and assume for simplicity that \pi electrons move on a straight line (one -dimensional box) whose length l can be estimated as equal to two C=C bond lengths (2*1.35 angstrom) , plus one C-C lengths. Butadiene has four \pi...

I am having a problem with my understanding. I could be incorrect, but I think that the magnetic field emitted from a magnet is consistent and doesn't weaken at points further away. Then could someone explain how magnet force weakens with distance. I would also like to know the math so here is a...

2 electrons in box, "hard" walls, total energy E. Say we place 2 electrons inside an empty 1m cubed box with very "hard" walls, the electrons can penetrate only a very small distance into the walls of the box. Let us say that any photons produced by the scattering of the two electrons stay in...

Hi everyone! I'm new to online math forums. I wonder if anyone can give me a hand on this - it would be greatly appreciated. Thank you in advance! Dave Homework Statement If a box with a square base and an open top is to have a volume of 160 cubic feet, find the dimensions of the box having...

Hello all, I came across what I think is a very interesting question the other day; How would you treat a particle trapped in a square well that had one finite wall and one infinite wall? Say for E[SUB]n[SUB]~(n*pi*(h-bar))2/(2m(L+2d)2) would you replace the 2d by 1d? As you can only find the...

Okay, so say that I stack three boxes, one on top of another. There is friction between all surface, including the bottom box and the ground. If I apply a force to the center box only, is there any set of circumstances under which the top box will slip? I know that if the applied force is...

Hello I'm designing a box for 6 PCBs. It will fly on stratospheric balloon. Do you know a solution of mounting PCBs to box walls, which will provide strong and stable connection? I was thinking about slots in internal walls, but that can be not enough. I found interesting solution...

Is there a "black box recorder" at the LHC? To explain the question further: are there real-time records of exactly what's going on and/or voice recorders, analogous to what there are in commercial jets? If there were to be a major catastrophe at the LHC, they would need to know precisely what...

Homework Statement A 10 kg box is being pushed up a slippery ramp as shown in Figure 2.1. The coefficient of friction between the box and the ramp is just μ = 0.1. (a) What force does the man need to apply to the box to keep it traveling up the ramp at a steady speed?Homework Equations I have...

Homework Statement A platform moves up and down in SHM, with amplitude 0.035 m. Resting on top of the platform is a block of wood. What is the shortest period of motion for the platform so that the block will remain in constant contact with it? Homework Equations...

Homework Statement Ok I know this question is really easy but for some reason I got it wrong. You are given a piece of sheet metal that is twice as long as it is wide and has an area of 800m^2. Find the dimensions of the rectangular box that would contain a maximum volume if it were...

I am posting this because I am sure there are plenty of other folks out there who have elderly parent's or relative's who want to use a PC, and are not all that savvy with them. When they run into problems, getting competent help can be expensive, and time consuming, not to mention...

Homework Statement A small mass m is in a box of mass M that is attached to a vertical spring of stiffness constant k. When displaced from its equilibrium position y0 to y1 and released, it executes simple harmonic motion. Calculate the reaction between m and M as a function of time. Does the...

Homework Statement A 16.0kg box slides 4.0m down the frictionless ramp shown in the figure, then collides with a spring whose spring constant is 240N/m. Figure Attached It is a two part question, I got neither and don't understand why. a)What is the maximum compression of the...

I have an issue I'm not quite sure how to approach. A customer is requesting that we prove that our battery pack chassis will not burst or deform if additional gases are introduced inside the enclosed box (the batteries could vent). The chassis is assumed to be a sealed .05" thick 5052 AL...

Homework Statement Find the volume of the largest rectangular box in the first octant with three faces in the coordinate planes and one vertex in the plane x + y + 4z = 4 Homework Equations Volume of a box with L being the length of a diagonal in that box = L3/(3sqrt3) Shortest...

I need some scientific assistance. A woman at work had the misfortune of a box falling and hitting her head. Fortunately she was fine, the box was not heavy and she had no injuries. Two years later i have a solicitors letter demanding money for fictitious injuries. Is it possible to get an...

Homework Statement A child drags a 20kg box across a lawn for 10m anfd along a sidewalk for 30m; the coefficient of friction is 0.25 for the first part of the trip and 0.55 for the second part. If the child always pulls horizontally, how much work does the child do on the box...

Homework Statement You push down on a box at an angle 15° below the horizontal with a force of 650 N. If the box is on a horizontal surface and the coefficient of static friction is 0.7, what is the heaviest box you will be able to move? Homework Equations F=ma The Attempt at a...

SOLVED (Example 6.15 from Modern Physics 3e- Serway) Homework Statement Compute the average position <x> for the particle in a box assuming it is in the ground stateHomework Equations |\Psi|^2=(2/L)\sin^2{(\pi x/L)} <x> = \int^{x_0+L}_{x_0}x|\Psi|^2dx The Attempt at a Solution...

Homework Statement A particle is in an infinite square well extending from x = 0 to x = a. Its state is a linear combination of the two lowest energy states. Psi(x, t) = A(2 Psi1(x, t) + Psi2(x, t)) a) If a measurement of energy is made what are the possible results of the measurement...

Homework Statement a constant force Fa of magnitude 85.0 N is applied to a 4.0 kg shoe box at angle φ = 53.0°, causing the box to move up a frictionless ramp at constant speed. How much work is done on the box by Fa when the box has moved through vertical distance h = 0.45 m? heres the...

[b]1. http://img10.imageshack.us/img10/8602/232cw.jpg /b][/URL] Homework Equations http://img199.imageshack.us/img199/484/232ag.jpg sorry about the insert pictures, i don't know how to type up the eqns easily The Attempt at a Solution Now I know that outside the box the schrodinger equation...

[url]tEJhnvX36hc&NR=1[/youtube] This is very amazing!

Hanging box -- radius, length, mass, speed Homework Statement You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.490 kg suspended from the ceiling of the bus by a string of length 1.79 m is found to hang at rest relative to the bus...

Video: http://www.cbsnews.com/video/watch/?id=6228923n http://techcrunch.com/2010/02/22/bloom-energy-boxes/ I don't understand how it works. You still need fuel to use it, so what problem does it solve?

Did anyone see the 60 minutes piece on the Bloom Box that was on last night? Do you guys think that this is a viable option in the alternative energy? Do you think that this could actually power all of our homes in the next decade or so? Link to the report...

Homework Statement Show that for a particle in a one dimensional box of length L, the probability of observing a value of p_x (recall \hat{p}_x is Hermitian and that \Psi is not an eigenfunction of \hat{p}_x) between p and dp is: \frac{4|N|^2 s^2}{L(s^2-b^2)^2}[1-(-1)^n \cos(bL)]dp where...

Homework Statement You and your friend Peter are putting new shingles on a roof pitched at 23degree . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.4 m away, asks you for the box of nails. Rather than carry the 2.3 kg box of nails...

Homework Statement Assume that the particle in the box is perturbed by a potential V_{1}(x) = x . Calculate the energy shift of the ground state and the first excited state in first-order perturbation theory. Homework Equations Unperturbed wave functions for the particle given by...

Newton's forces on a box! Homework Statement Two 45 N forces and a 90 N force act on a hanging box as shown in the picture below. Will the box experience acceleration? 1. Yes; upward. 2. No; it is balanced. 3. Unable to determine without the angle. 4. Yes; downward. Homework...

1. A rope is attached to a block. The rope pulls on the block with a force of 225 N, at an angle of 30 degrees to the horizontal (this force is equal to the tension in the rope). What is the x-component of the force on the block due to the rope? What is the y-component of the force on the...

Homework Statement A block has a mass of 20kg is at rest on the floor. This block is then pushed by a horizontal force of 8N across the floor. The final speed is 2 m/s. Determine the distance the box was pushed. Homework Equations Fnet=ma d=(t)(s) a=(chand in velocity)/(change in time)...

Homework Statement a 18.5 kg box is slid up a 5.6 m long ramp that makes an angle of 33 degrees with the floor. What is the gravitational potential energy of the box relative to the floor? m = 18.5 kg d = 5.6 m http://musr.physics.ubc.ca/~jess/symbols/Theta.gif = 33° PEg = ?Homework Equations...

I have a heat source inside a steel box. I know the outside ambient air temp and the amount of heat the source puts of. How do I calculate the internal air temp of the box?

A 23 kg box hangs from a rope. What is the tension in the rope if the following are true? a)The box is at rest? b)The box moves up at a steady 5.0 m/s? c)The box has Vy = 5.0 m/s and is speeding up at 5.0 m/s^2? d)The box has Vy = 5.0 m/s and is slowing down at 5.0 m/s^2 I have...

Homework Statement Consider the vector field \vec F=\frac{\vec r}{r^3} with \vec r =x\hat{i} +y\hat{j} +z\hat{k} Compute the flux of F out of the box 1\leq x \leq 2, 0\leq y \leq 1, 0\leq z \leq 1 Homework Equations I can't use the Gauss divergence theorem since the divergence of...

Homework Statement Determine the probability of finding a particle in a 1-D box of size L in a region of size 0.01L at the locations x = 0, 0.25L, 0.5L, 0.75L and L when it is in its ground state. As percentages Homework Equations \Psi(x)=\sqrt{\frac{2}{L}}sin(\frac{nxPI}{L})...