What is Strings: Definition and 548 Discussions

Adagio for Strings is a work by Samuel Barber, arguably his best known, arranged for string orchestra from the second movement of his String Quartet, Op. 11.
Barber finished the arrangement in 1936, the same year that he wrote the quartet. It was performed for the first time on November 5, 1938, by Arturo Toscanini conducting the NBC Symphony Orchestra in a radio broadcast from NBC Studio 8H. Toscanini also played the piece on his South American tour with the NBC Symphony in 1940.
Its reception was generally positive, with Alexander J. Morin writing that Adagio for Strings is "full of pathos and cathartic passion" and that it "rarely leaves a dry eye". The music is the setting for Barber's 1967 choral arrangement of Agnus Dei. Adagio for Strings has been featured in many TV shows and movies.

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  1. tom.stoer

    A critical look at strings - Carlo Rovelli

    http://arxiv.org/abs/1108.0868 A critical look at strings Authors: Carlo Rovelli (Submitted on 3 Aug 2011) Abstract: This is an invited contribution to the Special Issue of "Foundations of Physics" titled "Forty Years Of String Theory: Reflecting On the Foundations". I have been asked to assess...
  2. haushofer

    Static gauge for strings in curved background

    Hi, I have a question about the static gauge in string theory, in which one sets \tau = X^0 I understand that in the usual approach for strings in a flat target space, after the gauge fixing of the worldsheet metric gamma, \gamma_{\alpha\beta} = \eta_{\alpha\beta} one...
  3. F

    Force - boxes connected by strings

    Homework Statement Three boxes are connected by strings of constant length. (A--B--C--> F) An applied force F acts horizontal in the positive x direction. mc=5kg, mb=2mc, ma=2mb. The coefficients of static and kinetic friction are 0.2 and 0.1 respectively and are the same for each box. The...
  4. T

    Comp Sci How Does Java Treat Strings Like Primitive Data Types?

    "String" in java.. Homework Statement its a bit conceptual question. there is a string class which we use to store strings of letters. 1) but we don't create a reference to it,nor we instantiate it. 2) not even a method is invoked mean in printing, we just mention name of string class. 3)...
  5. W

    Calculating Beat Frequencies in Identical Strings with Varying Lengths

    Two strings which are fixed at both ends are identical except that one is 0.65 cm longer than the other. Waves on both of these string propagate with a speed of 34.9 m/sec and the fundamental frequency of the shorter string is 220 Hz. a) What is frequency of the beat that would result if...
  6. S

    Exploring Vibrating Strings and Branes for String Theory Testing

    How do we describe vibrating strinGs and branes? Is this connected with vibration of circular or quadratic membrane and PDE Helmholtz equation and how? How to test string theory in experiments?
  7. C

    Strings can vibrate, but do they move?

    I am trying to find out if my general understanding of the strings in string theory is correct. The strings can vibrate along different nodes to create the particles. Do the strings themselves ever wander around as a whole string, or would they be considered to be locked in place like pieces...
  8. N

    Conference Non-Commutative Geometry, Strings and Gravity

    A Conference in Tours on May 25-27 2011 organized by Prof. Ali Chamseddine and Prof. Michael Volkov and supported by the STUDIUM. The purpose of the STUDIUM CONFERENCE A conference to discuss recent developments in Noncommutative Geometry, Strings and Gravity among leaders in the three...
  9. B

    Is the number of strings constant?

    Hi, Can someone please tell me if current versions of string theory assume (or perhaps result in) a conservation of the number of strings in the universe? Just like conservation of matter and energy. If my lunch is made up of tiny vibrating strings, was it the same strings that existed...
  10. K

    'Levels of Reality' on the order of Strings

    Please forgive my lay understanding of String Theory, but when contemplating it, I am drawn to two questions; one at a level 'above' string theory and the other 'deeper'. I will begin with the former. As is my limited understanding, strings, according to restrictions placed upon them by the...
  11. cepheid

    Passing Strings as Arguments to Functions in C

    Hey everyone! If I have a function that takes a pointer to char (i.e. char array) as an argument, can I pass a "string literal" (I think that is the right term) as an argument to that function, even if that string hasn't previously been declared anywhere? For example: void myfunc(char...
  12. ChristinaJ

    Mathematica Mathematica - Label plot ticks using strings

    All, I have a ListSurfacePlot3D graphic and wish to label the tick marks using strings. For example if I have X={x1,x2,x3} I would like to label each tick mark at that point with a string, i.e. x1="a", x2="b" etc. I would also like to know how to take a list of strings and distribute them...
  13. X

    Pulley, Strings, Friction [Please]{Mechanics}

    Pulley, Strings, Friction [Please..]{Mechanics}[not Solved] Homework Statement 1) I am really confused about how tension is same on both sides of pulley. Also, how do friction of pulley affect tension in string? 2) Also want to know how tension provides torque to pulley since tension in...
  14. Z

    Vibrating strings and potential energy

    I read that the middle point of a string fixed between two rigid supports set in its fundamental mode of vibration has no potential energy. I would like to know the reason behind it. At the max displacement from the mean position, it must have max. potential energy.
  15. R

    Strings Double Slit Experiment

    If electrons are strings (in string theory), what happened to the string between emission at the double slit experiment and detection on the screen after it passes thru the 2 slits? Does the string splitted and joined again after the slits? Before string theory, we just say particle...
  16. L

    Mass attached to two opposing strings

    Homework Statement http://faculty.mint.ua.edu/~pleclair/ph125/Misc/PH105_exam2_1Nov_soln.pdf Similar to question two on this site. Except I'm looking for the velocity as the ball crosses the origin. Homework Equations Listed in the question. The Attempt at a Solution I got the...
  17. E

    Closed Strings and Virasoro algebra

    Hey guys, i just started taking a course on ST and so far we discuss the closed string following Green, Schwarz, Witten. I don't see the point of constructing the Virasoro algebra (formula 2.1.85 in GSW) if the corresponding generators are zero due to the constraints. Or to put it differently...
  18. R

    Strings as described in Superstring theory

    Are these 'strings' the size of planks constant? Nothing can obtain a size smaller than planks constant...right? What I am trying to figure out is if saying strings were the size of planks constant were a good approximation if the size of them
  19. L

    Are strings the key to understanding energy in string theory?

    Can anyone explanin to me how are strings related with energy, is enrgy created frmo strings or energy is something uncreated?
  20. C

    Three blocks connected by strings

    Homework Statement Three identical blocks, each of mass 0.6 kg, are connected by light strings. Assume that they lie on a frictionless, horizontal surface and are observed to have an acceleration of 4.0 m/s2 under the action of a force F. Homework Equations Calculate F and two tension...
  21. H

    Finding Frequencies in Two Strings Stuck Together

    Homework Statement Two strings have different lengths (L1 = 3.920 m and L2 = 1.960 m) and linear densities (mL1 = 2.64E-1 kg/m and mL2 = 6.60E-2 kg/m), as the drawing below shows. |........| |........| |----------------------------------| |........| |........| (Okay, only the "-"s...
  22. mccoy1

    Potential energy of two masses connected by 3 identical strings

    Hi fellows, 'Two particles of mass m are connected by three identical springs of relaxed length l and constrained to move longitudinally. What is the potential energy when the two masses are displaced from their equilibrium positions? What I know: let k = force constant of the strings, x1 and...
  23. M

    Exploring MSc Particles, Strings & Cosmology at Durham

    Hi folks, I'm a 3rd year student doing a BSc in Mathematics and Physics (in Scotland) and I was wondering if anyone could share with me their experiences of the MSc particles, strings and cosmology at Durham (previously MSc elementary particle theory) or any of the other similar courses at...
  24. P

    Tension of strings and gravity force help

    Homework Statement Q= 2800N G= 10m/s^2 s=35m t=10s __________ Fst=? (st-String tension) Can anyone help me with this, i have a test tomorrow And if anyone can give me the formula for the Tension force i'd be really grateful.
  25. D

    Tears in spacetime shielded by strings

    Hi all, Alright so while reading through some stuff, I came across something peciluar, string/M-theory state that rips in spacetime are a natural phenomenon and happen all the time. "Edward Witten showed that strings, which have spatial extant, can travel while encircling the tear as it...
  26. Z

    A crazy idea about strings and energy

    the question is could a STRING be a very long object with high energy wrapped into the size of the atom ?? the idea is if we could unroll an string would it deliver some kind of its energy ? for example if we have some kind of Einstein equation but for string in the sense that Energy E...
  27. M

    Solving Tension on Strings in Diagram

    Homework Statement Considering the following diagram: http://img545.imageshack.us/img545/6301/physx1.jpg AC is a force being exerted on chords AB and AE of magnitude 600N. Chord AE is attached to to surface FD. Chord B is attached to a second surface of which no information is...
  28. D

    Calibi-yau manifolds affecting the size of strings

    Hi all, I am rather new here but I think I am posting in the right place, if not my apologies :) Alright so I've been working on calibi-yau manifolds for some time now and string theory (let's take a generic approach here and not worry about which version) states that the shape of the manifold...
  29. C

    Does the poincare conjecture disprove the shape of strings in string theory

    Considering that the smallest particles in nature are supposed to be strings, which are donut and line shapes. And the poincare conjecture says the simplest shape in nature is a sphere. wouldn't it make sense that the true fundamental particles are sphere shaped and that if they combine to form...
  30. M

    Cold Guitar - Strings go Sharp

    So if I leave my steel strung guitar overnight in my cold basement, it goes out of tune on the sharp side. Now if I want to manually tune my guitar sharp, I have to tighten the strings = i.e. put energy into the system and do work. So where does the energy come from to do this in a cold...
  31. S

    String Theory - Winding Strings

    The answers will probably be "it ain't as simple as that" but here's trying, anyway. 1. Is current thinking that strings have to wind "around" something? If so, must the compactified space have at least one hole? 2. With just a single hole, presumably there can be just one topologically...
  32. G

    Acceleration of strings in two pulley systems

    Hi anyone, I'm confused about the magnitudes of the acceleration of the two objects here: It's been awhile since I try to find the answer on internet, I've found numbers of different answers, so I'd like to know if anyone could help me.. In my imagination, if the bigger object moves by...
  33. nomadreid

    Closed and open strings in M-theory

    Given my limited background in Physics, I am restricted to the popular literature on M-theory. After going through this literature (including articles from the very helpful "annotated list of useful literature for String Theory" posted in this rubric of the Forum), I am still puzzled by the...
  34. H

    Classical gravity, Supergravity and strings

    So the following questions were posed in an another thread by Pallen, and I thought i'd give an attempt at answering them, since they tend to show up over and over again. " 1) It is not clear that GR and QFT must be considered in conflict that must be resolved somehow. I've seen a growing...
  35. P

    2 vibrating strings and harmonics questions

    Homework Statement Two ukulele strings, of equal length and mass are tuned so that the first string, when it vibrates at twice its fundamental frequency, has the same frequency as the second string when it vibrates at three times its fundamental frequency. The tension of the first string is...
  36. F

    Comp Sci Reversing a Number Without Strings

    Create a program in which the digits returned are reversed such as if 234 was the input the output is 432. import java.util.*; public class Test{ public static void main(String[] args){ String revNum =""; int rem = 0; int n...
  37. T

    Charged Spheres Placed in an Electric Field, Suspended by Strings

    Homework Statement Two small spheres, each of mass 4.00g, are suspended by light strings 15cm in length. A uniform electric field is applied in the x direction. The spheres have charges equal to -7*10^-8 C and +7*10^-8 C. Determine the electric field that enables the spheres to be in...
  38. H

    Slide Block Problem With Strings

    Three blocks on a frictionless surface are connected by massless strings, with M1 = 1.30kg, M2 = 2.20kg, and M3 = 3.40kg. Due to the force F acting on M3, the system accelerates to the right. Given that T1 is 4.10Newtons, calculate T2. M1 = 1.30 kg M2 = 2.20 kg M3 = 3.40 kg and T1 =...
  39. B

    How Much Work is Required to Stretch a Series of Strings?

    Homework Statement Given the constants k_1 and k_2 and distance x, determine how much work is required to stretch the spring x from equilibrium position. Homework Equations W=\frac{1}{2}kx^2 The Attempt at a Solution All I need to determine is what my value is going to be for k...
  40. tony873004

    Calculating Mass of Light Fixture from Cable Tensions

    Homework Statement The figure shows a light fixture suspended from the ceiling. If the tension in cable 1 is 34N and the tension in cable 2 is 24N, what is the mass of the light fixture? Homework Equations Image http://orbitsimulator.com/misc/IMG00034-20101024-1557.jpg The Attempt...
  41. M

    What is the distance between strings and how are they spread across space?

    Hi, I would like to know what is the distance between strings (or average distance) ? and also in what manner are the strings spread across space? are they spread evenly ? can i find the exact amount of strings in any given location? thanks
  42. K

    Quasar Alignment to Cosmic Strings

    A very interesting but speculative paper was published in the Physical Review and arXiv recently about the possibility of the former existence of Cosmic Strings at the point of Electroweak energies. Robert Poltis and Dejan Stojkovic http://prl.aps.org/abstract/PRL/v105/i16/e161301...
  43. C

    Determining tension in strings

    Homework Statement An object of mass 100kg is hanging from a ceiling by means of 2 strings. The 1st string (t1) makes an angle of 55 degree with the horizontal-right. The scond string 9T-2) makes an angle of 25 degree with horizontal left. Calculate tension in the first string (T1)...
  44. S

    Why strings and not zero dimensional fundumental particles?

    Im aware that there has been some difficulties in zero dimensional particle calculations, which I suppose gave way to string theory which explains gravity. But i would like to have some more input on the exact problems when dealing with zero dimensional particles and why strings were added. Are...
  45. R

    2 differently weighted, charged balls hanging from strings that connect at common pt

    Homework Statement 2 small spheres of charge "q" suspended from strings of length "l" are connected at a common point. one sphere has mass m, the other 2m. Assume angles theta_1 and theta_2 that strings make with vertical are small. (a) how are theta_1 and theta_2 related? (b) show that the...
  46. Spinnor

    Strings still usefull in 4D spacetime?

    Can the strings of string theory live in only 4D spacetime? Do we get anything interesting or useful? What do we lose? Thanks for any ideas or help!
  47. C

    Tension with two strings and angles

    Can someone help me with this problem? I am stuck. So far I have:net Force (x) = T1cos30 - T2cos(θ) = 0 net Force (y) = T1sin30 + T2sin(θ) - 120N - 400N = 0 From equation 1 ---> cosθ = (T1cos30)/T2I attached a picture of the problem. Not...
  48. T

    A problem of strings, pulleys and weights

    Homework Statement The fig has three masses m1 , m2 , m3 .. all of which are unequal. Find relation between masses so that m3 remains stationary. ( pulleys , strings are frictionless and massless) The Attempt at a Solution I thought if mass on both side are equal then the system...
  49. R

    C: Pointers, Strings & Compiler Warnings

    In C, why do you have to define a pointer type? For a 32 bit computer, the address is 4 bytes long no matter what, so it shouldn't matter if the pointer is to a char or an int, yet I get a compiler warning when I use a char pointer to point to the address of an int. Also, I don't quite...
  50. T

    Forces in Equilibrium - Tension in Strings

    Homework Statement [PLAIN]http://img62.imageshack.us/img62/2120/derppz.jpg Need to find T1 + T2I can do it when the two masses are connected to each other, I was just wondering how I'd do it now there is another 5kg in the middle? Also if the acceleration is already given as 2m/s to the...
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