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. R

    What is the velocity of the block pulled by strings

    Homework Statement :[/B]In the arrangement shown in the figure, the two ends P and Q of the light unstrechable string move downward with uniform speed u as shown. The upward speed of the mass m is v. Then which of the following is correct: A) v cos60°=u B) 2v cos60=u C) v =2ucos60 D) v= u...
  2. D

    Python Extract all the text between the repeated unique strings in a large file

    How do I use Python to extract all text that comes between a recurring set of unique strings? Example: ABC;the red dragon;123, ABC;the blue dragons;123 ABC;the black dwarf;123, ABC;the gray elves;123 ABC;fantasy characters;123, ABC;winged balrogs;123 I want to parse through a large text file...
  3. H

    Rubber strings pulled and realeased -- find the max height

    Homework Statement Homework EquationsThe Attempt at a Solution I tried to find constant k f = k ##\Delta##x 1/2 * 9,8 = k * 0,1 k = 49 N/m is rubber string the same as spring? Ep + EK at 0,1 meter = Ek + EP at 0,3 m 1/2 k x^2 + 0 = 1/2 k x^2 + 1/2 mv^2 v^2 = 2*49(0,08) v = 7*0,4 = 2,8...
  4. C

    Tension in 4 strings suspending object at 4 different points

    Homework Statement A grid made of ropes is suspended by its four corners with strings tied to four different points on a building. Three of which are fixed and fourth is attached to a pulley which is in turn fixed to the building. Given data : Grid mass is 25 kilogram suspended at a height of...
  5. I

    Does the placement of weight affect tension in 3D?

    If you have a rectangular box connected on 3 sides with strings, and you hold all the strings together at a point, with your hand; then you put a weight in the center of the box, which is open, would the tension on the strings differ than if you put the weight at a corner. Please describe it to...
  6. M

    Tensions of Strings (HW Check)

    Homework Statement In Figure 5, the two strings attached to the mass are fixed to the ceiling and the wall, respectively. Determine the tensions in the strings. Figure: http://i.imgur.com/jbTo1Nnh.jpg Homework Equations Please look below. The Attempt at a Solution Ceiling ##= 37^o## Wall ##=...
  7. I

    Counting strings of alphabets 0,1,2 and 3

    Homework Statement Consider the collection of all strings of length 10 made up from the alphabet 0, 1, 2 and 3. How many of these strings have weight 3? How many have weight 4? How many have even weight ? Homework Equations Combinations formulae The Attempt at a Solution Let me explain what...
  8. G

    Confused about tension in strings

    Hello! I'm just having trouble understanding the logic about tension in strings. m = 5[kg] v = 2.8 [m/s] g = 10 [m/(s^2)] String in massless and air friction is negligible The question is what the tension in the string is when the ball is in the bottom position. My reasoning is that the...
  9. G

    Guitar Strings & Tuning Forks: Investigating Beats

    Homework Statement A guitar string with 0.60 m and 0.012 of mass vibrates with frequencies that are multiples of 109 Hz. Approaching to the string a tuning fork of 440 Hz we verify beats between the sound signals of the string and the tuning fork. Calculate the time interval between consecutive...
  10. K

    I Weak gravity conjecture and strings vs loops

    “If the weak gravity conjecture is right, loop quantum gravity is definitely wrong,” said Nima Arkani-Hamed, a professor at the Institute for Advanced Study who co-discovered the weak gravity conjecture. source...
  11. J

    Cosmology Book on Black Holes, Strings, AdS/CFT

    Hello, I would really like a book like Susskind's "An Introduction To Black Holes, Information And The String Theory Revolution: The Holographic Universe" but not so condensed. If you have anything to suggest please do so. Also, if you know of any book that contains any part of the above book in...
  12. binbagsss

    Strings, Virasoro Operators & constraints, mass of state

    Homework Statement Question: (With the following definitions here: - Consider ##L_0|x>=0## to show that ##m^2=\frac{1}{\alpha'}## - Consider ##L_1|x>=0 ## to conclude that ## 1+A-2B=0##- where ##d## is the dimension of the space ##d=\eta^{uv}\eta_{uv}## For the L1 operator I am able to get...
  13. binbagsss

    Strings, Virasoro Operators&constraints, commutator algrebra

    Homework Statement [/B] Question: (With the following definitions here: ) - Consider ##L_0|x>=0## to show that ##m^2=\frac{1}{\alpha'}## - Consider ##L_1|x>=0 ## to conclude that ## 1+A-2B=0## - where ##d## is the dimension of the space ##d=\eta^{uv}\eta_{uv}## For the L1 operator I am...
  14. binbagsss

    Strings - Visaro operators - basically commutator algebra

    Homework Statement Question: (With the following definitions here: ) - Consider ##L_0|x>=0## to show that ##m^2=\frac{1}{\alpha'}## - Consider ##L_1|x>=0 ## to conclude that ## 1+A-2B=0## - Consider ##L_2|x>=0 ## to conclude that ##d-4A-2B=0## - where ##d## is the dimension of the space...
  15. doktorwho

    How to dynamically allocate an array of strings

    I was supposed to write a program that has a while loop in which two people, person1 and person2 input a string. The program runs the loop until one of the people inputs "it's over". At that time the program should exit and print out the correspodance between these two people while they were in...
  16. doktorwho

    Help with pointers and strings in C

    Homework Statement I have to create a program that dynamically allocates a string and uses up no extra space (The string takes up as much space as it needs to),checks if entered string is 'please stop this', if it is then the prgogram exits and if it isn't then it continues, it makes a copy of...
  17. I

    B What exists between Strings in String Theory?

    Hello, I am new to this. As I understand it, the difference between the quantum field theory and string theory is that in the former, physical field is considered as the fundamental reality, while in the latter it is believed that everything comes out of strings. My question is, by everything do...
  18. Ayenyen

    What is the tension in the strings when the slender bar begins oscillating

    Homework Statement There is a uniform slender bar which is suspended by two light inextensible strings and hangs in equilibrium. (if the mass and length of the bar are m and 2b ) Now, someone slightly knocks one end to make the bar rotate around the vertical axis with initial angular velocity...
  19. E

    Java Recursively sorting an array of strings w/o aux. parameter

    One of my professor's assignments is proving particularly tricky for me. It reads: "Write the method public static void sort(String[] a) that sorts the array a in increasing order. The method must be a short recursive program. Do not use quicksort or merge sort. It should be a lot...
  20. D

    I Are Strings the Key to Understanding the Dimensions of Our Universe?

    If strings are one dimensional objects and they make up every particle that we know of then there is no second or third dimension. There are only one dimensional objects that seem like they are three dimensional objects because they spin as they move through space.
  21. EthanVandals

    A Box is suspended by two strings, what is the tension?

    1. The problem statement, all variables, and given/known data Suppose a block is suspended by two strings, one, T1, is anchored at 30 degrees to the horizon, the other, T2, at 60 degrees to the horizon. If the block weighs 100 kg, what is the tension in the two strings? Assume that: The...
  22. K_Physics

    Standing Waves On Strings: Harmonic and Frequency Problem

    Homework Statement String A is stretched between two clamps separated by distance L. String B, with the same linear density and under the same tension as string A. String B is stretched between two clamps separated by distance 4L. Consider the first eight harmonics of string B. For which of...
  23. N

    A Can strings increase length without changing their energy?

    For a string in string theory, Energy = string tension * length So I'm wondering if it can increase its length with increasing its energy.
  24. M

    A Why are open strings vectors or scalars, or massive?

    In string theory, if we have NN BCs along ##X^i, i = 1, \ldots, n-1## and DD BCs along ##X^a, a = n, \ldots, 25## then you get, from ##\alpha^{i,a}_{-1}|0,p\rangle ##, ##n## massless vectors and ##24-n## massless scalars. I understand that for the first excited level, ##M^2=0## and so we have...
  25. N

    How to know if all the strings have the same tension or not

  26. Mr Davis 97

    How many strings of four letters have x in them

    Homework Statement How many strings of four lowercase letters have x in them? Homework EquationsThe Attempt at a Solution It seems that there are two ways of doing this. First, there are four ways to choose where the x goes, and then there are 25^3 number of ways to choose what the other...
  27. G

    Finding maximum height of a string before it goes slack

    Homework Statement A mass m is suspended by a light elastic string. When the mass remains at rest it is at a point 0, which is a distance a + b below the point from which the string is suspended from the ceiling, where a is the natural length of the string. The mass is pulled down a distance h...
  28. zoobyshoe

    The Rubber Band Theory of Bow Strings

    When I was 6 or 7 I decided to make a bow and arrow one day. I had never seen or handled one in real life, but it was intuitively obvious to me from TV that they way to do this was to tie the ends of a stretched rubber band to the ends of a stick. This would have worked, after a fashion...
  29. N

    Tension Force between two rotating masses on strings

    Homework Statement Two balls with masses m1=0.3 kg and m2=0.7 kg are connected by massless strings with lengths L1=0.2 m and L2=0.26 m, as shown. The arrangement of strings and masses rotates at constant angular frequency ω=57.6 radians/s around a fixed pivot point. Find the two tensions...
  30. Hamal_Arietis

    What is the ratio of lengths for two vibrating strings with a beat frequency?

    Homework Statement Two strings are stretched tautly parallel to each other. The length of one is L1 and the length of the other is L2(>L1). When both are simultaneously made to undergo fundamental vibration, beats can be heard at a frequency n. The waves in both strings travel at the same...
  31. B

    B Digit insertion into infinite strings behind the decimal?

    This is about the legitimacy of a possible operation. Take 0.999999... The operation is defined like this: 1) identify the insertion position with respect to the decimal. in this example we choose "3" as in the third position, 0.999999... 2) from the insertion position, inclusive, to the...
  32. S

    Schools Top schools in North America in strings and quantum gravity

    Hi, the question is obvious from the title. I am looking for the names of the top 30 schools in North America for research work in string theory and quantum gravity. Any feedback will be very helpful.
  33. J

    Incline angle for accelerating cart and Tensions in strings for a suspended mass

    Homework Statement Hi all, I have solved these problems just wanted to see if it's all ok problem 1: a trolley starts at the lowest point of a diagonal plane with a 20m/s speed. Its acceleration is 4m/s^2 going downhill, the trolley goes up then slows until it reaches 0 speed and then goes...
  34. G

    A Strings vs. point interactions in QFT?

    Hi all! I have a question regarding the principal difference between QFT and string theory according to popular accounts. It is said that QFT deals with point particles leading to the well-known infinities in calculating the transition amplitudes whereas in string theory the interaction is...
  35. W

    B Strings 2016 Videos: Unwatchable & Unresponsive

    Is it just me or are the videos at Strings 2016 unwatchable? They start and stop and continually seem to buffer, as if the bandwidth is not sufficient. The organizers did not respond to my email. I don't see a way to download and view offline, and I can't tell anything about the streams, e.g...
  36. P

    A Does String Theory have any equations yet? I chose not to....

    Back when I was studying at Princeton University, J.A. Wheeler introduced me to Ed Witten while we were having lunch at the Institute for Advanced Study (IAS). I knew Feynman’s and Wheeler’s views on “String Theory,” and I had looked into it a bit as a field of research, but I couldn’t seem to...
  37. V

    Two masses on strings crossing each other

    Homework Statement Homework EquationsThe Attempt at a Solution Suppose tension in the left string mAM be T1 and tension in the right string mBM be T2 .When the particles cross each other then the angle made by string mA and mB with vertical is α and that made by AM and BM be β . The speed...
  38. C

    B Space-Time & Strings: Current Thinking?

    I'm not a physicist so forgive me if this is a bad/stupid question, but i was just wondering what the current thinking was on a couple of things. (From what I understand space-time is a bit like a matrix which spreads out over the universe - and also gives us gravity etc?) 1. Does space time...
  39. defaultusername

    Is the Tension Force in an Atwood Machine Only Transmitted Between Blocks?

    Homework Statement When talking about an Atwood machine, a student states: Is the student correct or incorrect? Why? Homework Equations Tension = mg + ma The Attempt at a Solution This is how it is making sense in my mind, but correct me if I'm wrong. I am thinking that the student is...
  40. Q

    Combinatorics -- Counting Sets of Binary Strings

    Homework Statement Give combinatorial proofs of the identities below. Use the following structure for each proof. First, define an appropriate set S. Next, show that the left side of the equation counts the number of elements in S. Then show that, from another perspective, the right side of the...
  41. Marcin H

    Vibrating Strings: Determining Wave Speed From Eq of Best Fit

    Homework Statement From the equation of best fit, determine the wave speed, v, for your string. Homework Equations f=(v/2L)n The Attempt at a Solution So I am supposed to find the speed of a wave using that graph and data. Do I just take the slope and replace the (f/n) in the equation? I...
  42. D

    B Strings as Hoola Hoops: Exploring their Movement and Interactions

    Is this correct? Strings are one dimensional objects that form circles (hoola hoops) that flip in certain directions as they move through space. The strings can collide with other hoola hoops and break, then reform into other hoola hoops with different properties.
  43. Spinnor

    B Vibrating strings, quark strings more complicated?

    Do we know enough of string theory to say that because a quark is more complicated, in the sense that the quark experiences four forces verses three for the electron and two for a neutrino, that in terms of string vibrations quarks will have more complicated vibration patterns than electrons and...
  44. G

    FSM that only accepts strings w/ equal number of 1's and 0's

    Question: Suppose you have a finite state machine that accepts only strings with an equal number of zeros and ones. Show that you can then construct a finite state machine that accepts only strings of the form 0^n 1^n, i.e., an arbitrary finite number of zeros followed by the same number of...
  45. M

    MHB Sounds waves and guitar strings

    C=130Hz G=196Hz D=293Hz A=440 Hz The distance from the nut to the bridge is 58cm, the amplitude of the string vibration is 2.2mm Part A: What is the period (T) of the G string? Part B: What is the side to side velocity of the g string? (Think simple harmonic motion) Part C: The diameter of the...
  46. M

    MHB What is the Speed of the Wave on a Guitar's A String?

    C=130Hz G=196Hz D=293Hz A=440 Hz The distance from the nut to the bridge is 58cm, the amplitude of the string vibration is 2.2mm Question: How fast does the wave move across the A string?
  47. Qturtle

    Quantization of classical strings - a beginner's question

    Hey all. I've started to read and watch lectures on string theory. usually everyone starts with a classical relativistic particle action, and then goes to a classical relativistic string action. after they finish with the classical string they start the quantization process. my question is...
  48. S

    Calculation of Tensions on Strings that suspends an object

    Suppose an object of mass m is hung in a steady state by two strings. One string makes an angle 60 deg. at the point of contact with the object with the horizontal line. The other string makes 45 deg. To find the tensions in these strings (T1 and T2) we take all Horizontal Forces or their...
  49. bcrowell

    Video of guitar strings from inside guitar

    Several of my students have pointed me to this video: http://bit.ly/1N1IGR8 Apparently the guy put his cell phone inside his guitar and took a video. My initial reaction was that it looked fake, because the time scale of the movement of his thumb seemed mismatched to the time scale of the motion...
  50. J

    Tension problem with 2 strings, 1 mass

    Homework Statement So In this problem, I have two strings, one string pulls with pounds and is 30 degrees away from an imaginary line straight down of of the two strings and there are no variables or degrees given for the second string. The weight is 20 pounds. I have been looking at this...
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