String Definition and 1000 Threads

Homework Statement The fundamental frequency of vibration of a particular string is f. What would the fundamental frequency be if the length of the string were to be halved and the tension in it were to be increased by a factor of 4? Answer: 4 f 2. The attempt at a solution We have f = f1...

Homework Statement So, a string with length L and a mass of M is given tension T. Find the frequencies of the smallest three modes of transverse motion. Then compare with a massless string with the same tension and length, but there are 3 masses of M/3 equally spaced. So this is problem #1...

I heard that the LHC was supposed to do some testing on supersymmetry but i didn't hear anything from them and is string theory still possible or not.

Did string theory come about as a possible solution to quantum mechanic's "something being in several places at the same time" paradox so to speak? I am not a math-guy or pretend to know anything about physics. I m just curious. I was thinking that what appears as something being in multiple...

Maybe I'm thinking about this incorrectly, but I would assume that the wave loses energy after bouncing back and before hitting the wave moving in the opposite direction. Wouldn't this prevent a perfect null (if the amplitudes were different)?

hey hey :) So this is the code i came up with %% part 2 x=[1 2 3 4 5]; % 1 is freshman % 2 is softmore % 3 is junior % 4 is senior % >4 is super senior for i=1:5 s=input('number: '); switch s case 1 yearNumber='freshman'; case 2...

Homework Statement I am currently coding a program which reads a file and makes a graph based on the arrangement of the data in the file. The first line of the file stands for the number of vertices and the rest of the lines stand for the edges something like this: 3 1 2 2 3 3 4 In the first...

I came across the term "Misner string" in this paper: http://arxiv.org/abs/1509.07854 My understanding is that this originated in the study of spacetimes such as Taub-NUT. If I'm understanding correctly, this involves CTCs encircling the string. Misner's original interpretation of the string...

I'm Indian and I've heard stuff that it is difficult to get into a good PhD program in the US/UK for string theory because the competition is more fierce than other fields. Furthermore,the likelihood for getting academic positions is even tougher(added to the fact that I'm from a different...

Hello, I have a problem that seems to have beaten me. I want to make a cable-driven reduction system between a threaded rod (pinion) and a larger threaded cylinder. Because of string walking, the string between the two has to stay at all times straight, parallel to the ground so that...

Two 2.4-kg blocks are connected by a string draped over the edge of a slippery table, so that one block is on the table and the other is just hanging off the edge. A restraint holds the block on the table in place, and the string is 0.50 m long. After the restraint is removed, what speed does...

Homework Statement [/B] Your niece finds her father's watch. The light watch chain has a length of 48 cm, and the mass of the watch is 270 g. Your niece swings the watch in a vertical circle, maintaining the speed of the watch at 2.3 m/s. Find the tension in the chain when it makes an angle of...

On a test our teacher asked about a system composed of (string -> mass -> string -> mass) hanging, that began to oscillate up and down. We all considered weight (mg) when applying Newton's second law to find the associated differential equation. When we met our teacher again he said that we...

So my pulley system has 3 masses two of which are connected to a center mass on top of a table. No mass was given for any of the objects but of two masses hanging from the table, the one on the right is 2 times the mass on the left. I hope I haven't confused you but its like a three step diagram...

in transverse wave (traveling pulse) when a particle move down it has maximum velocity at equilibrium point , why it stop suddenly at this point?

Do you know where I can order a part that connects string to the ceiling? The part has to be rotate free with very tiny friction. Inside the part may be air filled or vacuum. There has to be no hard wired connection between the ceiling and the part. I would make one if I know how. Hope someone...

Is it possible to predict the damping coefficient of a string using a mathematical simulation that included the string's diameter, length, frequency (and therefore tension), material density, and elastic modulus (if not also its Poisson's ratio) as opposed to simply looking at the amplitudes of...

Is it possible to vibrate a string with electricity? I'm guessing an electro-magnet placed close to the string would be able to vibrate it. If the electro-magnet is used to vibrate the string, I'm guessing the electro-magnet should be pulsed at the fundamental resonate frequency of the string...

In the figure we see two blocks connected by a string and tied to a wall, with θ = 33°. The mass of the lower block is m = 0.9 kg; the mass of the upper block is 4.0 kg. Find the tension in the string that is tied to the wall. -I have the forces of Block A as Tension, Normal Force, and Gravity...

I have put together an equation whose purpose is: With a desired 'magnitude of static friction' ( μ_s ), 'fundamental frequency' ( f ), and 'tension' ( T ), initial conditions such as 'string breakover angle' ( Θ_0 ), 'nut-tuner distance' ( L_{h,0} ), and 'string diameter' ( d ), and...

Homework Statement A 10.0kg sphere is attached to the incline by a horizontal string. Determine the tension in the string. Homework Equations (F⃗ net)x=ΣFx=0 (F⃗ net)y=ΣFy=0 Στ=0 τ = (radial disance)(F) The Attempt at a Solution 1. I began by determining all the relevant forces associated...

Can the 5brane turn into a fundamental string?

Homework Statement [/B] This graph shows an infinite string on the x-axis. The middle part is deformed as shown. The string is released at time t=0 - give the analytical solution of the problem, i.e. find for t>0 - sketch the string displacement \xi(x) for a sequence of times t. (I'd like...

Homework Statement A particle of mass m is whirled on the end of a string of length R. The motion is in vertical plane in Earth's gravitational field . The instantaneous speed is v when the string makes angle Ө with the horizontal. Find the tension T in the string and the tangential...

A unknot is pretty much a circle or a 2-sphere, so is a closed string, maybe a bit more irregular but approximatly the same. Of course more is needed to identify the closed string as an unknot than the shape. I assume that it is not so, yet I have no reason to deny it. I hope you may give me a...

I have been following along the problem on SO(32) st. in Zwiebach's "A first course in String theory" and my question concerns this problem. I have no problem with the mathematics of SO(32), at least not at the simple level Zwiebach discusses it, rather the "why" behind a particular concept of...

Can someone explain string theory? and how it works please? I am really interested thanks :D

Hi, friendsi! My text of physics, Gettys', shows how the energy, both kynetic and potential, of a small element ##\Delta x## of a string, through which a wave (whose wave function is ##y:\mathbb{R}^2\to\mathbb{R}##, ##(x,t)\mapsto y(x,t)##) runs, is: ##\Delta E=\Big[...

http://arxiv.org/abs/1503.09158 Is this a legitimite thing? I've never heard of 4th color charge or quark-lepton unification.

Homework Statement This is the answer : For part d) of this question, I don't understand "stretching/extension reduces and velocity increases/height increases" . Homework Equations Hooke's Law: F=kx The Attempt at a Solution Ok, so if extension is reduce, then force reduces too. Then...

Hello, Before starting, I would like to apologize for any errors in the use of symbols. This is my first time :sorry:. I am studying the wonderful book of Barton Zwiebach, "A First Course in StringTheory". In chapter 02, I am experiencing for the first time with the mathematics of special...

Can the M theory/ string theory coexist with the penrose interpretation of quantum mechanics?

Homework Statement http://imgur.com/FZM5gqC,RlLeGmP#1 http://imgur.com/FZM5gqC,RlLeGmP#0 Homework Equations f^k_{AB} = \mu_k N_{AB} W_{f,i} = \int_{r_i}^{r_f} \vec{F} \cdot d\vec{r} E^{mech}_f = E^{mech}_i + W^{NC}_{f,i} U_{elastic} = \frac{1}{2} k x^2 The Attempt at a Solution Since the...

1. Homework Statement A 30-cm long string, with one end clamped and the other free to move transversely, is vibrating in its second harmonic. The wavelength of the constituent traveling waves is A -- 10 cm B -- 40 cm C -- 120 cm D -- 30 cm E -- 60 cm Homework Equations for second...

1. Homework Statement Two blocks of masses m1 = 3.7 kg and m2 = 3.3 kg are connected by a string as shown in the figure above. The horizontal surface is frictionless. A 15 N force directed at 18 degrees above the horizontal acts on m2. Determine the acceleration of the blocks and the tension in...

Strings are said to be one dimensional, due to the math. And I understand that there are problems in the math when they put the strings in 3 or 2 dimensions. According to string theory, lengths smaller than Planck length have no physical significance. Could it be that strings are 3...

Hello, I have the configuration as shown in attached picture. I know how to calculate string tension and measure frequency if the string is not moving. But what happens if the string is moving at a constant speed? Are there still standing waves? Can we still calculate the string tension? What if...

I get that tension in a mass-less string arises because of electrostatic forces which arise because atoms of the string are pulled apart. I also understand that it is equal and opposite in direction at all points because otherwise the string would accelerate infinitely. But what about the last...

By considering the superposition of two waves propagating through a string, one representing the original or incident wave and the other representing the wave reflected at the fixed end, if both ends of the string is fixed then the waves can reflected and travel back and forth. Standing wave can...

A wave pulse on a string moving from left to right towards a free end will reflect and propagates from right to left with the same speed and amplitude as the incident wave, and with the same polarity. My question is, why the slope and the vertical force must be zero at the free end? If the...

In deriving wave equation or power transmission of wave transmitted by a string, it is usually stated (with some assumptions) that the transverse force on a point of the string is proportional to the slope at that point. An example is given in p.20 of this notes...

Homework Statement the maximum force is F=F1 +F2 + T as shown in the textbook... I can't understand why the tension of spring is also = F1...Is it because of the writer assume the spring is directly attached to the part P (upper part of the block) ?? Homework EquationsThe Attempt at a Solution

(Note: The title would better describe the subject if written like this: "2 blocks on a horizontal frictionless surface connected by a massless string vs. pulley system")Hello, I have a problem regarding pulling two blocks of different masses connected by a string horizontally with opposing...

Homework Statement A string is connected to a box A mass M at its left end and a box B mass 2M at its right end. Boxes A and B start pulling in opposite directions at the same time with forces which are time dependent and described by functions F(t)=Ct for box A and F(t)=Dt for box B. Values of...

Homework Statement A chicken and rooster are fighting over a 1 kg string of spaghetti. The chicken pulls with 999 N and Rooster pulls with 1000 N. The net force is 1 N, so relative to the ground, will the spaghetti string accelerate at 1m/s^2 (considering both the chicken and rooster continue...

Let's say I go to the store and purchase a rope. On the package of string, it says that the string can only withstand 100 Newtons before the rope snaps. I go home and test the tension in the rope. I tell a friend to pull on the rope at 99 Newtons while I pull on the rope with 99 Newtons. Did...

Homework Statement a non uniform string of length L and mass M, has a variable linear density given by μ=kx where k is the distance measured from one side of the string and k is a costant. a) find that M=(kL2)/2 b) show that the time t required to a pulse generated from one side of the string...

What is the quantized form of the strings lagrangian?

Hey everyone, This may not be the right place to post this, so if an admin thinks a different section would be better suited, please move this thread. So I'm in the midst of my summer internship at Fermilab right now. I'm currently trying to plot some data for the beam intensity of the NuMI...

String theory is what I'm currently studying. The dominant form is the action formulation of it. A classical string Lagrangian is submitted and quantized to produce the equations of motion of a string. Is there a purely quantum formulation of string theory that doesn't start with a classical...