Box Definition and 1000 Threads

Homework Statement f(x)=6x^2+9x-6 Where does this function intersect the x-axis (i.e. what are the roots or zeroes of f(x))? Solve by factoring using the Box Method. When I use the method that is shown on this website http://www.purplemath.com/modules/factquad2.htm for this...

So Tychonoff theorem states products of compact sets are compact in the product topology. is this true for the box topology? counterexample?

In order to get an appreciation for the time scales involved, think about a block that slides without friction down a ramp that is inclined at an angle q above the horizontal. Initially the block is at rest a distance s (measured along the plane) from the bottom. Click the button marked “DATA”...

Hey PF! Short First Post Intro: I've been a long time spectator here. I'm a junior undergrad physics major. PF has been a lot of fun, and tremendous help to me (like last winter I applied to many REU's). So thank you all! At the REU I'm in now, I'm learning linux. I'd love to hear any of...

Homework Statement Consider a three dimensional rectangular infinite potential well with sides of length L, 2L and 3L. What is the energy of the first excited state relative to the energy of the ground state? The second state? The third? The fourth? Homework Equations...

Hi guys, I am designing a mixing box for different gases. Here is my plan: I will use Acrylic panels with the dimension of 30cm x 30cm x30cm. Two 3/4 inch pipes feed inflows at flow rate of 1300 LPM in total. The outlet is an rectangular opening of 8cm x 8cm. How can I define the pressure inside...

Hi all, If one were to consider a classical particle in a box of length L in Minkowski space then clearly the time taken to go between the walls of the box is L/v with v velocity. In the GR case with some metric coefficients A(r) and B(r) (spherically symmetric system, say) it's clear that...

Homework Statement Stewart Calculus 6E: 4.7 #14 A rectangular storage container with an open top is to have a volume of 10m³. The length of it's base is twice the width. Material for the base costs $10 per square meter. Material for the sides cost $6 per square meter. Find the cost of...

Future of a particle in a box -- I'm fundamentally confused Homework Statement A particle is somewhere in the right half of a one-dimensional infinite potential well with sides at x=-a/2 and x=a/2. The particle's wave function is constant over x, i.e. \psi(x) = \sqrt{2/a} for 0<x<a/2...

Homework Statement How much work is required to empty a 2x1x1 ft box of water? Assume density of water is 62.5 lb/ft3. Homework Equations \int_a^b A(x)xdx A(x)=lw=2 The Attempt at a Solution 62.5\int_0^1 2xdx=125\left[ \frac{x^2}{2} \right]_0^1=62.5 Did I get it right?

So I built this really nice woofer box for my 6.5inch sub. All clear acrylic, and working on sealing and reinforcing the sides and back. My question is this: Given that I purchased a Dayton Audio 25W plate style woofer amplifier, is there any way I can hook this up so that I can plug a string...

Hi everyone. I am currently carrying out an experiment whereby I have a closed tank of water submerged in a larger tank. The water in the smaller box is heated and I am interested in the heat loss from the tank. I have done a rough theoretical calculation based on U values, where by I obtain...

This is Grade 12 Physics lab assigned to me : Bonus: Performing the lab+making a conclusion to answer the research question. I thought whole day but can't think of any research question with box of matches. Could anyone please help me out with this?

Homework Statement I just don't understand how to describe how, if a person pushes on a box and the box exerts an exactly equal but opposite force on the person that the person is still able to move the box... Homework Equations n/a The Attempt at a Solution n/a

[FONT="Arial"]Hey all! I am thinking of building a box in which the insides can be held a constant temperature. I would like to see if I can determine some parameters for the box. My first step is to determine heat loss through the box. I'm estimating that the largest difference in heat...

I have been thinking out of the box and I have come to the conclusion that something cannot exist without consuming something else. I know this sounds really wacky (for want of a better phrase :)) which is why I posted this in the Quantum forum, lol. We know plants consume nutrients and use...

Can electric fields can be completely shielded using a metal box or metal sphere, please clarify the concept.

Heat / Smoke / Pressure in a confined box?? I am a fireman with 15 years on the job. I am also an instructor at 2 different fire academies and within both my career agency as well as in my volunteer department. I often watch numerous videos and try to extract "teachable" moments. Recently I...

Another student was asking me about how to calculate L in a one-dimensional box, given that an electron with a wavelength of 418nm moves from energy-level n=2 to energy-level n=4. Using, ΔE = Ef - Ei, I can say that ΔE = E4 - E2 = ((42 - 22) * h2 ) / (8mL2) Rearranging for L is simple...

In the figure, the cylinder and pulley turn without friction about stationary horizontal axies. A rope of negligible mass is wrapped around the cylinder, passes over the pulley, and has a 3.00-kg box suspended from its free end. There is no slipping between the rope and the pulley surface. The...

Hi I do 3D modeling and lately i have been trying to make some more theoretic diagrams about the whole thing. Sometimes i try to go through ways where math and geometry are needed (or so i think) and my background is not up to it. I'll use this thread to post some initial questions per post...

Box counting dimension! please help! Hi all, I am working on a problem from Chaos theory, I have to find the box counting dimension of the set {0}U{n^-p} where n is an integer and p>0. I started this problem by considering p=1. So, the set looks like {0,1,1/2,1/3,...}. If I take intervals...

Homework Statement A box of volume .5m^3 contains air pressure 3*10^5 n/m^2, and air composition of 80% N2 and 20% O2. There is a small hole of area 1*10^6 m^2 in one face. The exterior of the box has air of the same composition and temperature but pressure of 1*10^5. How long will it...

Homework Statement A certain force moves a 4kg box from rest to a velocity of 6m/s in 3 seconds. If the coefficient of friction between the box and floor is 0.05, what is the magnitude of the force? m=4kg v0=0 v=6m/s t=3s μk=0.05 Homework Equations a=v/t F0=mg P=Ft P=mv The...

Homework Statement This is a two part problem. I think I am pretty close, but I'm quite understanding it. Which sucks because this is probably an extremely easy question.:frown: I have five particles in a box with S spin. I am to find the ground state of the five particles if they have...

Homework Statement for a wave function confined between x=0 and x=L find an expression for A in order that the wave function be normalized The Attempt at a Solution for a particle in a box between 0 and L the normalized wave function is integral of C2sin2(n\pix/L).dx = 1 using trig...

Homework Statement A 5.5kg box is attached to a spring which is attached to a wall. The box is subject to a force of 90N moving it from its equilibrium to a position 40cm away, the coefficient of kinetic friction is 0.300. a. what is the work done by the applied force over the 40 cm? b.what...

We did a lab with decade resistance boxes. We had to set up three boxes of the same resistance in parallel. However, I am confused as to how to connect the cords. We used an ammeter to measure the current and a dc voltage machine. Can someone please show a diagram on how to hook up the boxes...

Homework Statement First Problem: A cyclist coasts down a 3 degree hill at a constant speed of 2.2 m/s. When the cyclist pumps hard, they can descend the hill at 12.6 m/s. Using the same power, what is the speed the cyclist can climb uphill? The cyclist and bicycle weigh 70 kg. Assume that...

Homework Statement What are the factors that determines the thermal energy of a gas in a 3d object like a box Homework Equations The Attempt at a Solution I think thermal energy can be referred to as potential energy and also kinetic energy inside the box. If they are essentially...

excuse me,may someone list down all the gearbox components, i have some difficulties in finding all this..tq..

Homework Statement If there are 2 particles of mass m1 and m2 in a one dimensional box of width a, I'm trying to find 1)what values will be found if the energy is measured, and with what probability these values will take occur. and 2) what is the probability of finding particle 1 with mass...

If there are 2 particles of mass m1 and m2 in a one dimensional box of width a, I'm trying to find 1)what values will be found if the energy is measured, and with what probability these values will take occur. and 2) what is the probability of finding particle 1 with mass m1 in the interval...

The box weighs 400lb and the person can pull with 200 lb of force. Will this person be able to raise the box? What is the maximum weight he can life using the pulley system? Sorry i couldn't figure out how to start. Appreciate any help, Thanks!

Homework Statement A 2.40 kg block is dropped onto a spring and platform of negligible mass. The block is released a distance of 5.00 m above the platform. When the block is momentarily at rest, the spring is compressed by 25.0 cm. Find the speed of the block when the compression of the spring...

Homework Statement If you have seen the treatment of calculation of density of states using standing wave formalism in Modern Physics by Arthur Beiser, their are these observations of which i am not completely convinced, with wavelength fixed, he transforms wavelength into energy, using...

Help with box on sled slope problem! I've attempted this question and have re done the question about 3 times, getting the same answer. A rope attached to a 20kg wood sled pulls the sled up a 20 degree snow covered hill. A 10kg wood box rides on top of the sled. If the tension in the rope...

Homework Statement Show that the probability of finding a particle p=\Psi^2 is at max at x=xj where xj=(2j+1/2n)a where j=0,1,2,3...n-1 and a is width of well Homework Equations p(x) = (2/a)sin^2((n*pi*x)/a) The Attempt at a Solution Im so confused I don't know where to...

I know that work=force*distance. So here's a scenario for you. Suppose I hold a heavy box over my head. I keep holding it until I get very tired and cannot keep it up. Naturally the box then falls to the ground at my feet. At that moment, the Earth's gravitational field performs work on...

Homework Statement A block weighing 87.5 N rests on a plane inclined at 25.0o to the horizontal. A force is applied to the object at 50.0o to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively...

Homework Statement A box, whose weight is 182 kg, is drawn with constant speed 21 m along a horizontal concrete floor. The kinetic friction between the box and the floor is 0.58. (acceleration due to gravity, g = 9,81 m/s2). Homework Equations Calculate the work done when the box is drawn...

Homework Statement please see q attached.. Homework Equations The Attempt at a Solution Ok so I've shown that all the first order energy shifts are zero. I'm just not sure what the simple explanation for this is...? THanks!

Homework Statement Q.1Why when the particle's kinetic energy is smaller, the wave has longer wavelength and higher amplitude? Q.2 Why the length of box decrease in ground state? <All in attachment> Homework Equations The Attempt at a Solution Q.1 wavenumber k=...

Question: You and your friend Peter are putting new shingles on a roof pitched at 25 . You're sitting on the very top of the roof when Peter, who is at the edge of the roof directly below you, 5.5 away, asks you for the box of nails. Rather than carry the 2.0 box of nails down to Peter, you...

"a block of mass m is sliding on a frictionless incline of 30 degrees. this incline has mass m and it has no friction with the ground. compute the acceleration for both objects." I'm having some conceptual trouble with this problem as it's been a while since my physics course and I've had...

Homework Statement A 45.0 kg box is pulled with a force of 205 N by a rope held at an angle of 46.5° to the horizontal. The velocity of the box increases from 1.00 m/s to 1.50 m/s in 2.50 s. Calculate a) Net force acting horizontally on the box b) Frictional force on the box c)...

Homework Statement A 7.5 kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. a) If the box is being lifted at a constant speed of 2.0 m/s, what is the power delivered by the person pulling on the...

Homework Statement A 60 kg box is dragged along a rough but level floor by a rope at a 30o angle to the horizontal. The tension in the rope is 150 N, and the box is speeding up at 0.80 m/s2 (along the floor). (a) How large is the frictional force of the floor on the box? Homework...

Homework Statement Homework Equations Trigonometry Geometry - Intersection on a Line Physics - Newtons Laws The Attempt at a Solution I am just lost. I move the Cartesian coordinates to the incline of the free body diagram to begin.I know that the normal force is perpendicular...

Homework Statement A cubic cardboard box of side a = 0.440 m is placed so that its edges are parallel to the coordinate axes, as shown in the figure. There is NO net electric charge inside the box, but the space in and around the box is filled with a nonuniform electric field of the...