Box Definition and 1000 Threads

Homework Statement The screwengineer Pelle has a box with 16 black screws and 16 white screws. a. In how many ways can he pick an even(at least 2) amount of screws from the box? b. Pelle randomly chooses one of the alternatives in (a), what's the chance that gets as many white as black...

I'm going to finish my undergrad in about 3 semesters, and I've come to realize through school and internships that if I have to do any programmming for a full-time job upon graduation, I will go insane. So my question is this, and the answer may be a simple 'no, that's ridiculous'. Are there...

Lorentzian contraction of a box increases the pressure inside? I have been doing some research on gravity, and I am having a very hard time with the following example I found in a book entitled Gravity From the Ground Up by Bernard Schutz. It sounds like a 3rd grader explaining...

Imagine a perfectly reflecting box with a homogenous distribution of photons within it with total energy E (not entirely sure how close to possible this is, but don't worry about that). I would have thought this box's gravitational field would be very much like the combination of the the box's...

Homework Statement V(x) = 0 if \frac{-L}{2}<x<\frac{L}{2} and \infty otherwise. Is the wave function \Psi = (2/L)^{1/2} (sin (\pix/L) an acceptable solution to this? Explain Homework Equations H\Psi= E\Psi , normalization: 1 = \int wavefunction^{2}dx The Attempt at a Solution...

Homework Statement A 250N force is directed horizontally to push a 29kg box up a plane that is inclined at 27 degrees to the horizontal. the box moves up the plane at a constant speed. Determine the magnitude of the normal force, and the coefficient of kinetic friction. g=9.8m/s^2 a(y) =...

Homework Statement use the Aufbau process to determine the ground state electronic configuration for the 2D sqare well if it contains 4 electrons. what is the multiplicity of the ground state electronic configuration? what is the energy of this 2 D 4 electrons system? and is the system...

Hello friends I have a problem.please give me the answer. Two blocks of masses 6kg and 4kg connected by a rope are resting on frictionless floor.If an instantaneous force of 60N is applied to 6kg block for only a second.Then what is the acceleration of the first and second block.Is the...

Homework Statement Mass of box: 27.0 kg mass of bucket attached to pulley: 25.0 kg incline:35 degrees static friction:.650 kinetic friciton: .490 Okay, there is a box on an incline. The box is attached to a pulley. A bucket is attached to the other end of the pulley. The bucket is going...

Dear All I have approximately 300liters of water that I would like to house in a box. However I would like to check up on my water every now and again so I would like to make it out of clear perspex/acrylic. I could make it out of glass, but perspex is cheaper and easier for me to handle...

hello I need to informations about soliton. I know that soliton is a wave box with constant amplitude and velocity. but this datas cannot answer my requirement. piease help me fast.

Homework Statement determine the magnitude of the frictional force acting on the box on the plane Homework Equations f=ma The Attempt at a Solution no clue. help ??

Homework Statement I already have the solution to the problem. Just need some help deciphering the logic behind it. There are V balls, which are identical except for their color. N of them are blue and V-N are red. We place the balls inside a box so that V/2 balls are on each side...

not sure if this is posted, so imagine i have a 3- dimensional cube. let's say its about 10m x 10m x 10m in volume. this cube is empty on the inside but its inner surface is covered with mirrors. normal plane mirrors all around the walls, like tiles but instead mirrors. so what happens if i...

Homework Statement A spring with a force constant of 225 N/m is resting on a friction-less surface and mounted against a wall horizontally. A 1.5 kg box is pushed against the spring and compresses it 12 cm (0.12m) from equilibrium. When released the spring pushes the box across the...

Homework Statement A ball was thrown into a box. Determine Ek, P, and throwing speed when the: mass of softball = 172.7g mass of packed box = 2,043.5g and the box moved from 0 cm to 2cm. and the spring scale that remained parallel to the floor was Ff=8N. Homework Equations Ff=\muFn Velocity...

Homework Statement A rope attached to a 19.0kg wood sled pulls the sled up a 22.0 degree snow-covered hill. A 11.0 kg wood box rides on top of the sled. Homework Equations I have no what the equation may be, I was just doing some research and came across this website plus others and...

Homework Statement A rope is 10.0 m long and is attached at points A and B, which are at the same elevation 6.0 m apart. If a 50.0 kg mass is attached to the rope 4.0 m away from point A, what is the tension in the two segments of the rope? Homework Equations W = ma ƩFy = 0 = T1 + T2 - W...

Homework Statement A block with mass m = 3.57 kg is attached to a spring with spring constant k = 165.7 N/m and negligible mass. The coefficient of kinetic friction between the block and the table is µk = 0.239. The box is displaced from its equilibrium position to the left by 0.216 m. If the...

Hey, all. I've got a project that I need to do for work, but I'm not sure where to start. I need to design and build a box that will run on and put out 24 VDC, but also be able to put out +/- 10 VDC. The current does not go above 2 amps. It will also need to have test points to monitor the...

So. This annoying project attack's again. I have to create a box to catch an unadulterated egg at the base of my school balconies. Starting at 18 ft. I have no clue were to even start! worse part, its due very soon and my 'group' refuses to help. I do not know what to do. my only limits are the...

Homework Statement A box of mass m with an initial velocity of v0 slides down a plane, inclined at θ with respect to the horizontal. The coefficient of kinetic friction is μ. The box stops after sliding a distance x. How much work is done by friction? Homework Equations...

If I understand the Black Box Theory correctly, I should be able to put a set of musical patterns into the black box. This will give me predictable outcomes based on data entered. The more patterns the more predictable the outcome. Am I close?

Homework Statement An airtight box, having a lid of area 80 cm2, is partially evacuated. Atmospheric pressure is 1.01 105 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was: Homework Equations The Attempt at a Solution I figure that the...

Homework Statement Hello, its been a long time since I've worked with statics or dynamics in college and now find myself in the workfield trying to figure out a current problem! What I am looking for is how much force is needed to tip a box. The box i have has dimensions of: Length=400in...

Here's the question: Two boxes are placed on top of one another. The top box has a weight of 20 N and the bottom box has a weight of 50 N. You can neglect friction between the bottom box and the floor, but uS = 0.5 and uK = 0.4. You can assume g = 10m/s^2. Both boxes are initially at rest...

Homework Statement a crate with mass m rests on a horizontal floor. a woman pushes down at an angle of theta below the horizontalon the frace with a force F, the coefficient of kinetic friction is Uk. a) what magnitude of force F is required to keep the crate moving at a constant velocity...

Hi, I apologize if this question has been asked before or if it is dumb, but... I'm trying to learn some supersymmetry and have been working through Wess and Bagger. However, I have become confused in chapter 9, when they calculate the propagators of a free chiral superfield theory. My...

ok this was a problem in my book and the answer apparently is 29N. I have the diagram and pictures below. I know that the pivot point will be the edge of the block that is touching the outside of the wheel. When the wheel is in equilibrium the sum of the torque will=zero so i can set up the...

Is it okay to compare box plots with different number of data (number of n)? Thank you very much.

Homework Statement A 3.10 box is moving to the right with speed 8.50 on a horizontal, frictionless surface. At t=0, a horizontal force is applied to the box. The force is directed to the left and has magnitude F(t)= (6.00 N/s^2)t^2 What distance does the box move from its position at...

Hi everybody. I'm beginning my first course on quantum physics, and our professor introduced the box normalization for plane waves. My question is: why do we need to impose conditions on the borders? I haven't been able to find any explanation on the internet, as every text I found just...

Homework Statement We have been examining a one-dimensional infinite square well where the infinite walls are located at -b and +b. The energy levels in this quantum system are non-degenerate, that is for each energy there is only one wave function. Let us place an infinite potential step...

Homework Statement A box is sliding up an incline that makes an angle of 17.0° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.180. The initial speed of the box at the bottom of the incline is 1.30 m/s. How far does the...

Homework Statement The airlines accept a box if length + width + height <= 62. If h is fixed, show that the maximum volume (62-w-h)wh is V = h(31 - h/2)^2. The Attempt at a Solution Well, I multipied: V(h) = (62-w-h)wh V(h) = 62wh - w^2h - wh^2 dv/dt = 62w - w^2 - 2w = 60w - w^2 0 = 60w...

Homework Statement A 2kg box is at the top of an inclined plane that is 10m long. The inclined plane makes an angle of 30° with the ground. The μk of the ramp is 0.36 and the μk of the flat ground at the end of the ramp is 0.50. How far does the box travel along the flat ground until it stops...

Homework Statement use the variational method to approximate the ground state energy of the particle in a one-dimentional box using the normalized trial wavefunction ∅(x)=Nx^{k}(a-x)^{k} where k is the parameter. Demonstrate why we choose the positive number rather than the negative...

"A loaded penguin sled weighing 69 N rests on a plane inclined at angle θ = 22° to the horizontal. Between the sled and the plane, the coefficient of static friction is 0.25, and the coefficient of kinetic friction is 0.20. (a) What is the minimum magnitude of the force , parallel to the...

"box of primes" over l V X a l ^2 Homework Statement Find B, and t for these space curves (t = torsion) r(t) = (3sint)i + (3cost)j + 4tk Homework Equations Ok, so in my textbook i have two different equations to find the answer to this. the "box of primes" over l V X a l ^2...

Homework Statement A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 130.0 N at an angle of 15.0° above the horizontal. The box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and...

Sorry for not using the proper post format. I'm typing on my phone and the post template doesn't show up. Question: a box is sitting in the back of a truck which accelerates forward when a traffic light turns green. Which of the following statements is correct if the boxdoes not slip? The...

I have very little background in physics and I only have basic calculus under my belt... but I can't seem to get this thought out of my head. There is no mathematical proofs here, no experimental evidence, not even any real evidence for theory, however I'd like to hear your thoughts on the...

Homework Statement I am supposed to show, using a classical argument, that the speed "v" of a particle in an infinite 1-D potential well is v= (nh)/(2mL) Homework Equations The Attempt at a Solution Doesn't the particle just reflect back and forth against the walls of the...

Homework Statement Show that the probability of obtaining En for a particle in a box with wave function \Psi(x) = \sqrt{\frac{30}{L^{5}}}(x)(L-x) for 0 < x < L and \Psi(x) = 0 for everywhere else is given by |cn|2 = 240/(n6\pi6)[1-(-1)n]2Homework Equations cn = \int\psi^{*}_{n}\Psi(x)dx...

Suppose a box is sitting, motionless, on an inclined plane which makes an angle \theta with the horizontal. If I'm not mistaken, if one writes out Newton's law in the y direction (if +y is up), one gets N \cos \theta - mg = 0; i.e., N = mg \sec \theta. However, if you ROTATE the coordinate...

Homework Statement Vector V = <x2yz2, xy3z> 0<=x <=a 0 <= y <= b 0<= z <= c Homework Equations \intV \bullet \hat{n}dS In our case, this amounts \int\intV(either x or y component) dot \hat{i} or \hat{j} dA. The Attempt at a Solution Okay, I have tried to break apart the...

Homework Statement I can't figure out how to start to find the components of these vectors! (see attached) It seems like there's not enough info :( What am I missing?! Homework Equations The Attempt at a Solution

I am teaching myself quantum mechanics and have just read the particle in a box explanation, which is the first derivation of a theoretical reason why only discrete energy levels are possible within certain bound scenarios. In Shankar, the argument uses a requirement that the wave function...

In my book of formulas I have a formula for energy in different states, particle in box. E_n = \frac{n^2 \pi^2 \hbar^2}{2ma^2} So I should get Joule or something here right. A quick look at the formula. E_n = \frac{n^2 \pi^2 \hbar^2 [Js]}{2m[kg]a^2 [m^2]} \frac{ [Js]^2}{[kg]* [m^2]}...

Homework Statement A 10kg Box is being pushed up a 3m long hill at the angle of 30 degrees. A constant force is being applied to the box parallel to the ramp. The box starts from rest. For questions a and b we can assume no friction. a) If you were to get the box to the top of the hill in...