Box Definition and 1000 Threads

Homework Statement A 12 kg box is being held on a 23 degree frictionless incline. Find the box's equation once released. Homework Equations Net force=ma Fpull-Fparallel=ma The Attempt at a Solution 12kg x 9.8m/s = 117.6 N (Fpull-mgsin23)= ma sub. known values in...

Homework Statement A two-terminal “black box” is known to contain an inductor L, a capacitor C, and a resistor R. On connecting a 1.5 V battery, 1.5 mA flows. When an AC voltage of 1V RMS at 60 Hz is connected, 10 mA RMS flows. As the frequency increases at a fixed 1 V RMS, the current...

Homework Statement A 95-kg box is sliding along a level floor with a vi of 15m/s. a) how large of a constant frictional force is needed to stop to box in a distance of 15m? b)What is the coefficent of friction between the box and the floor. Homework Equations I tried to use...

Homework Statement How to find the uk of a box sliding down a hill with only an angle and acceleration Given: angle= 30 acceleration= 3.1 m/s2 Homework Equations 1. uk= fk/fn 2. f=ma The Attempt at a Solution i did the cosine of my angle but i am not sure that is the answer

Homework Statement A student pulls a box of books on a smooth horizontal floor with a force of 138 N in a direction of 23.9° above the horizontal. If the mass of the box and the books is 51.6 kg, what is the acceleration of the box? A constant force of 2.2 N is required to drag a 49.2 kg...

Homework Statement A box initially at rest at the top of a frictionless ramp is allowed to slide to the bottom. At the bottom its speed is 4 m/s. Next, the box is again slid down the ramp, but this time it does not start from rest. It has an initial speed of 3 m/s at the top. How fast is it...

Did the 'particle in a box' calculations come about when all those famous quantum physicists were forumlating the basics of quantum mechanics? It's the first thing taught in nearly all qm courses, but when was it first considered/published?

there is a box with wheels and man inside it.my teacher is said there is no way to man move the box while his inside. i said opposite. i know I am right but i can't prove. can you help me? sry for bad eng.(not my natural lang.)

Homework Statement A 13.25 kg box rest on a table. What is the weight of the box? Homework Equations I know this is really easy, but how would I do this? The Attempt at a Solution

I am with a search team who use Mobile Signal to guess the whereabout of missing persons. I was told that for 900MHz GSM Signal can go as far as 30km if weather permits. I know where the station "B" is, it is about 20km away from my current location "A". At "A", I can receive somewhat...

Homework Statement A 15.0 kg box is released on a 30 degree incline and accelerates down the incline at .30 m/s^2. Find the firctiopn force impeding its motion. What is the coefficient of kinetic friction? Homework Equations simga F = ma Force of friction = MU F_N The Attempt at a...

Basically this is easy stuff I'm doing but i'n not sure whether i made a mistake or my answer is actually correct physically. I'm solving the 1-dimensional TISE for a particle confined to a box -a<x<a. I found that the eigenfunctions for this particle in a box with periodic boundary...

Homework Statement Electron in a box has 2 sequential energy levels of 1.5 eV and 2.1 eV Calculate the spring constant Homework Equations E[n]=n^2*E[0] Therefore, 2.1/1.5 = 1.4 = (6^2)/(5^2) and the quantum levels are 5 and 6 E[0] = (h^2)(pi^2)/2(m)(L^2) The Attempt at a Solution...

Homework Statement A box is floating in a liquid. It is pushed down then released to oscillate. How do I determine the period of this oscillation? No idea where to go with this one. Homework Equations The Attempt at a Solution

Homework Statement A box has 10 bass, 6 are black and 4 are white. Three balls are removed from the box, color unknown. Find the probability that a fourth ball removed will be white. Homework Equations The Attempt at a Solution I got: \frac{4}{10} * \frac{3}{9} * \frac{2}{8} * \frac{1}{7}...

Virtual Machines: Do you have one ? Xen,VMware, Virtual Box Hi ... all ...Do you have a virtual machine ? (XEN, VMware, VirtualBox, or any other ...) ... please give more info on how you are using it ? I''m trying to find out what are the different ways to use them ?... how are people...

If you were to put 1 atom every element in its elemental form in a box, what would be the resulting compounds? 1.) I know it's probably impossible. 2.) I don't mean highly radioactive elements (transuranium metals, francium, radon, astatine, etc.) 3.) I'm really only talking about some of...

Homework Statement Determine the dimensions of a rectangular box, open at the top, having volume 4 m3, and requiring the least amount of material for its construction. Use the second partials test. (Hint: Take advantage of the symmetry of the problem.) Homework Equations The...

Homework Statement http://img7.imageshack.us/img7/1826/43544187.jpg Homework Equations The Attempt at a Solution whats wrong with my answers? everything looks right to me... :S

I need help with this problem please. Finding the max volume of a box with an open lid. Using a 20 in by 20 inch sheet of cardboard and cutting out the corners. Equations i been using: Volume: Length*Width*height Area: L*W Perimeter: 2L+2W Can someone help me get started

If Einstein's box (http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html ) is full of phonons instead of photons, the momentum is Mv=E/c' and time is t=L/c' where c' is the velocity of a phonon. The result should now be E=mc'^2 rather than E=mc^2. E=mc^2 is tenable to photons...

Einstein proposed a very simple derivation to E=mc^2 in 1940s which is well-known as Einstein’s box and a brief introduction is in http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html . If this event occurs in media instead of vacuum, the light speed should be u=c/n rather than c...

Homework Statement A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.18 and the push imparts an initial speed of 4.1 m/s? Homework Equations MG of the object = mass * 9.8 Friction = mg * 0.18 The...

Homework Statement I believe this is a pretty standard question. A particle is initially in the ground state of a box of length L. Suddenly, the box expands symmetrically to twice its size, without disturbing the wavefunction. Show that the probability of finding the particle in the ground...

Homework Statement When a hydrogen atom undergoes a transition from the n=2 state to the n=1 level, a photon with \lambda=122nm is emitted. a)If the atom is modeled as an electron in a one-dimensional box, what is the width of the box in order for the n=2 to n=1 transition to correspond...

1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...

1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...

a box of mass 12-kg slides at a speed of 10m/s across a smooth level floor, where it enters a rough portion 3 m in length. in the rough portion, the box experiences a horizontal frictional force of 72N. a) How much work is done by the frictional force? b) what is the velocity of the box...

Homework Statement A box of mass m2 = 3.5kg rests on a frictionless horizontal shelf and is attached by strings to boxes of masses m1 = 1.5 kg and m3 = 2.5kg, which hang freely as shown in the figure. The system is initially at rest. After it is released, find A) the tension in each string and...

[SOLVED] Elastic and gravitational potential energy First off, long time lurker here on his first post. Your forum seems absolutely brilliant, so I hope you can help me :) Homework Statement A box on an elastic string is dropped down an incline and proceeds to slide the distance L before...

Guys,, how can i rotate a big metallic box,, what should i use ! what is its name in english ?? rotating cylinder? rotating discs? what's the name of the thing? anyone got me ?

Homework Statement Consider a particle in a 1-D box with impenetrable walls at x=0 and x=L. Then the eigen function for this problem is of the form, \Psi(x) = \sqrt{2/L}sin(n\pi\ x/L) This is always of odd parity. The question which is troubling me is that, in this case...

Homework Statement A book with cover dimensions 5in x 7in is to be placed symmetrically in a diamond shaped gift box. What is the smallest possible area of the box? Explain how you know your answer is minimal. Homework Equations n/a The Attempt at a Solution i don't know how to...

Homework Statement A net force of 4N to the right is applied to a box of 6kg while moving it a distance of 3m to the right. (1)How much work is done on the box? (2)What if the force is applied at a 30 degree angle above horizontal? Homework Equations (1) W=Fdcos(angle) (2)...

Homework Statement Elevator cabs A and B are connected by a short cable and can be pulled upward or lowered by the cable above cab A. Cab A has mass 1700 kg; cab B has mass 1300 kg. A 12.0 kg box of catnip lies on the floor of cab A. The tension in the cable connecting the cabs is 1.91×10^4...

In Misner-Thorne-Wheeler Gravitation, Chapter 4, Page 92, Box 4.1, at section 4, there is a formula for the contraction of a p-form and a p-vector. Now, it states that the contraction of a p-form basis with a p-vector basis gives the antisymmetrizer symbol, \left\langle {\omega ^{i_1 } \wedge...

I have a massless and perfectly reflecting sphere or a box. Inside I have 0.5kg of matter + 0.5kg of antimatter. Far away from this sphere I have a small test body. I detects a gravity from mass of 1kg. Now matter and antimatter annihilate. As nothing happens outside, the test body is...

Homework Statement a) A cubical box is to be built so that it holds 125 cm3. How precisely should the edge be made so that the volume will be corrected to within 3 cm3? The Attempt at a Solution I am not sure even what this is asking exactly could someone decode if they have seen a...

Below is an excerpt from Quantum Enigma: Physics Encounters Consciousness. I have a few questions following the text. The text goes on to describe that by opening holes in the boxes, the wave function leaks out of both boxes and falls on a screen to which an atom will stick, resulting in...

1. As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the...

I'm trying to figure this out. Suppose a box is on a conveyor belt, and the conveyor belt is moving faster and faster to the right, so that static friction has already been overcome. This means that relative to the conveyor belt, the box is accelerating to the left. But what is the net force...

Homework Statement How much work do we do when we pull a wooden block with a mass m = 1 kg and we displace it for ∆x= 1 m. The object is being pulled on a rough surface with a coefficient of friction µ_k = 0.1. We are pulling the object with a string; the angle between the string and the...

Hi... I'm reading about "Particle in a box", and I really can't seem to figure out what "Energy Levels" actually means. The thing in my book is a bit slacky, so I'm not quite sure that I understand. So could anyone maybe explain to me what the "Energy Levels" in "Particle in a box" is ...

Homework Statement A stockroom worker pushes a box with mass 11.1 kg on a horizontal surface with a constant speed of 3.80 m/s. The coefficient of kinetic friction between the box and the surface is 0.170. Homework Equations F=ma w=mg What horizontal force must be applied by the...

Homework Statement In a physics lab experiment, a 6.25 kg box is pushed across a flat table by a horizontal force F If the box is moving at a constant speed of 0.400 m/s and the coefficient of kinetic friction is 0.120, what is the magnitude of F? What is the magnitude of F if the...

Homework Statement A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0o on either side of the vertical direction. What is the tension in each cable? Homework Equations Force = mass(acceleration) Weight = mass(gravity) The Attempt at a...

Homework Statement A m = 2.7 kg wood box slides down a vertical wood wall while you push on it at a θ = 35° angle. What magnitude of force should you apply to cause the box to slide down at a constant speed? Homework Equations The Attempt at a Solution I got 64.5766 N for the...

Homework Statement Students at an engineering contest use a compressed-air cannon to shoot a softball at a box being hoisted straight up at 10m/s by a crane. The cannon, tilted upward at a 30 degree angle, is 100m from the box and fires by remote control the instant the box leaves the ground...

hello, consider a man falling from a roof with a heavy box in his hands. what should he do with the box?

If you are inside a box that is spinning, can u detect its motion? At first i was thinking you can't the same way as if the box is moving forward. However, I was thinking that moving in a straight line involves one vector while spinning creates different ones so that you CAN detect...