Strings Definition and 523 Threads

I am required to use getline() and sscanf() somewhere in my function to read standard input and store it into arrays. I have input like this: 10/10/08 12:00 A1:2.31:1:P 2B:1.98:2:g 2b:1.82:3:b the first line is the time, which i used strcpy to copy it to an array called time[] the...

This is a general question... Given a pulley system that consists of one pulley and 2 strings--each with a mass hanging from it. One mass is 3kg, the other is 4kg. In class we concluded that the tension on each string was equal--why?

A mass of 6 kg is hanging from a string, named string 3. The top of this string is connected to to other strings, string one which goes straight to the left to connect with a wall, and string two which connects to the ceiling making a 40 degree angle between the ceiling and the string. The...

[b]1. problem one 3.1 kg paint bucket is hangin by a massless cord from another 3.1 kg paint bucket, also hanging by a massless cord. if the buckets are at rest, what is the tension in each cord? If the two buckets are pulled upwards with an acceleration of 1.9 m/s^2 by the upper cord...

I have got a question i am having a lot of trouble with. The question is that three strings on unequal lengths are used to support a mass of 50g. All of these strings are used to support the weight. Two of these strings cannot be in the same plane as the other string. Determine the tension...

Homework Statement The 4.00kg block in the figure (Intro 1 figure) is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in the diagram and the tension in the upper string is 82.0 N. Homework...

Hey Guys, I am currently reading Brian Greene's The Elegant Universe which introduces many of the basic ideas behind string theory. While reading it i am constantly reminded of the skepticism with which many people regard string theory and it makes me wonder whether the book is biased or...

Homework Statement A bird feeder of large mass is hung from a tree limb, as the drawing shows. A cord attached to the bottom of the feeder has been left dangling free. A child pulls on the dangling cord. The dangling cord is cut from the same source as the cord attached to the limb. Is the...

So, what are the theories' predictions which are going to be tested on LHC? And if they won't be found, Does it mean they will be refuted or not?

Homework Statement Three strings, in the horizontal plane, meet in a knot and are pulled with three forces such that the knot is held stationary. The tension in string 1 is T1 = 2.9 N. The angle between strings 1 and 2 is q12 = 130° and the angle between strings 1 and 3 is q13 = 120° with...

To prove that some function is limited we use |an|\leq K (n \in \mathbb{N}) where K = max { |m| , |M| } What this last part mean K = max { |m| , |M| } ? Thank you.

Is there any general formula for strings? For example: what is the formula of this string -1,3,-5,7,-9,...? Thanks.

mass m suspended by a pair of vertical ropes attached to the ceiling what are the rope tensions if they comprise a V shape each at an angle theta with the ceiling? i have played with this problem for a while and i can't seem to find what the relevant equations are really only first time...

I've just read in the first pages of The Elegant Universe that Greene believes that all fundamental laws should be contained in the microscopic domain, all other laws are derived. Is it really so evident that the laws of thermodynamics are derived and not fundamental? The second law, is it...

The fundamental part of string theory is that particles are in fact made up of vibrating strings. So this means that the lowest form of unit is a vibrating string? It goes like this Human - made up of atoms - atoms made up of subatoms (electrons, protons and neutrons)- quarks. And then...

Astronauts in space cannot weigh themselves by standing on a bathroom scale. Instead, they determine their mass by oscillating on a large spring. Suppose an astronaut attaches one end of a large spring to her belt and the other end to a hook on the wall of the space capsule. A fellow astronaut...

Consider this real situation: Light from a far-background galaxy is observed to be lensed by a closer massive galaxy. Individual photons that graze the closer galaxy travel to the observer along various geodesic paths, as prescibed by GR. Now consider a very hypothetical situation. Suppose a...

I posted link to the Strings 2008 speaker lineup at the Announcements sticky. We can do some digging and get prepared for what is to be expected. there are eight one-hour overview talks, and nearly 30 half-hour specialized research talks. All the talks are plenary--all in the same...

Say you have 2 masses connected by a massless string, and another massless string is connected to the rightmost mass. A tension force T acts along this rightmost string, resulting in the string connecting the 2 masses to become taunt. In these cases, you can treat the 2 masses as one mass...

My final exam is tuesday and I am having an extremely extremely hard time grasping arrays and strings. I just can't visualize how they work and I am stuck on how to get my printOwnedShares function to work properly in a project that will help me study for the final. This is what I have worked on...

Two masses are connected by a string and are hanging from the ceiling of an elevator like this: [string 1] | [4kg mass] | [string 2] | [6kg mass] Show the tension of each string in the following situations: i) Stationary ii) Moving up at 3m/s iii) Moving down at...

Homework Statement A 1.0kg ball is attached to a vertical rod by two strings. Each string is 1.0m long, and they are attached to the rod a distance of 1.0m apart. The rod-ball-strings setup is rotating about the axis of the rod. As it rotates the strings are taut and form an equilateral...

Could the string theory be interpreted as low-energy theory of elementary particles? As is known, the theory of strings has many interesting and important possibilities, but it cannot be verified because of the Planckian scale. Does arise the question: is it possible to construct the theory...

Could someone tell about the physical meaning of these SO(32) groups in superstring theory? I am under the impression that it is a symmetry of the quantum superstring, but that it is not a symmetry of any underlying classical model, is it? Because if it is so, it is very different of the GUT...

c++ strings help! Homework Statement Create a C++ program that would ask the user for a username and password. Password field should be masked. If the user exceeded three errors, a string will be seen on the screen which says “ERROR” and exits the program. username: ayen_lee...

Just a couple of Questions: for the wave function y(x,t) = A / (x-vt)^2+b ------> What is the importance of 'b' and what is its meaning? A Uniform Circular Hoop of string of mass m and radius r is rotating in the absence of gravity. Its tangential speed is Vo. Its length is...

Homework Statement Two wires are tied to the 360 g sphere shown in Figure CP7.61. The sphere revolves in a hori*zontal circle at a constant speed of 6.5 m/s. What is the tension in each of the wires? Homework Equations I can't figure how to find the tension. With so little given i dnt...

[SOLVED] Tension in Strings HELP thanks!--very simple. Homework Statement A 16 kg object hangs in equilibrium from a string with a total length of L=5m and a linear mass density of u= 0.0010 kg/m. The string is wrapped around two light, frictionless pulleys that are separated by a distance...

Homework Statement A rigid uniform horizontal bar of mass m1 = 85.00 kg and length L = 5.300 m is supported by two vertical massless strings. String A is attached at a distance d = 1.500 m from the left end of the bar and is connected to the top plate. String B is attached to the left end of...

Can someone please explain to me why string theories with open strings must also have closed strings? I've read it is due to conservation of energy, an open string not attached to a closed string will lose it's energy off an end. Does this mean all D-branes must be made from closed strings? I...

controversial new study indicates that there are traces of vast cosmic strings left over in radiation from the early universe. If indeed confirmed to be real, these cosmic strings would offer an unprecedented window into the extreme physics of origins of the universe. The idea is that snags...

Hey, what are the laws of vibrating strings? I can't find it in my college physics books! Help please!

Homework Statement A ball of mass 1.21 kg is attached to a rotating shaft by two strings, putting the ball into circular motion. Tension on the upper string is 35N. (The length of the strings is 1.6m) a) draw a free body diagram for forces acting on the ball. b) determine the tension in...

Homework Statement Two pendula are suspended on 70cm strings connected at the same point on a ceiling. The mass on the left is 45g and is held so the string makes an angle of 10 degrees with the vertical. The mass on the right is 65g and is held in the opposite direction so the string makes...

Homework Statement Two copper wires, one 1.0 mm in diameter and 1.0 m long, the other 2.0 mm in diameter and 2.0 m long, are joined together end-to-end and hung vertically. In order to tension this compound wire, a block is suspended from it. It is found that a transverse pulse takes 50...

One of the things that LHC will experimentally search for are supersymmetric partners of the Standard-Model particles. Maybe it will found them, maybe it will not. But what if it will? The existence of supersymmetry does not imply the existence of superstrings. However, string theory is...

Homework Statement A ball of mass 0.765 kg is tied to the end of a string of length 1.59 m and swung in a vertical circle. During one complete circle, starting anywhere, calculate the total work done on the ball by the tension in the string. During one complete circle, starting...

help me! Homework Statement Three blocks on a frictionless surface are connected by massless strings, with M1 = 1.80 kg, M2 = 2.80 kg, and M3 = 3.70 kg. Due to the force F acting on M3, as shown, the system accelerates to the right. Given that T1 is 2.70 N, calculate T2 Homework...

Hi all. It's been quite a while since I've been here, but I was reminded this morning about my childhood when a friend of mine and I got a hold of a spool of string that was purported to have been 5 miles in length. Thinking about it I think it was probably more like some 5000 feet in length...

4096 colours!? http://motls.blogspot.com/2007/08/answering-few-string-related-questions.html

Penrose proved that a more than 4-dimensional spacetime would be unstable.. does this mean that String theory is completely wrong?? (since this only works on 11 dimensions). Also without offending nobody's beliefs .. .what're the proofs for the existence of String theory ??, its math elegance...

From what I gather string theory states that everything is made of tiny vibrating strings or bands. But what force or energy causes these strings to constantly vibrate?

Hi all, I asked about this on the academic and career guidance forum but didn't get any useful replies. Which of these maths subjects (all at fourth year level) would you recommend for someone interested in the subjects listed in the title? What would you say is missing from this list...

In http://xxx.lanl.gov/abs/0705.3542 strings are derived from an attempt to formulate a more fundamental view of quantum mechanics, based on Bohmian interpretation of quantum mechanics. Such a more fundamental view is motivated by some foundational problems of quantum field theory (QFT), such...

[SOLVED] Mass per Unit Length of Violin Strings Homework Statement Each string on a violin is tuned to a frequency 1.5 times that of its neighbor. If all the strings are to be placed under the same tension, what must be the mass per unit length of each string relative to that of the lowest...

Dark energy is said to be a property of space that stretches a volume of space in all directions.If space is made of strings, do individual strings expand in all directions? And since the universe is changing its expansion rate, do strings obey some law like Hooke's Law:force (tension) is...

What exactly are hash functions and how do you use them to create a random string? What other ways are there to create random strings.

Hi everybody I’m currently making/coding my own guitar synthesiser and I are interested in creating a 'bend' playing effect. By modifying the tension of guitar strings I presume I will be able to change the rate in which sounds travels in these strings. From playing guitar myself I thought...

When a pendulum is moving will the length of the string that the bob is attached to appear to be contracted?I have this doubt as the string is sometimes in direction of motion and at one point absolutely not in the direction of motion

I am asking is light as it is related to particles could be (wave/particle theory) could be composed of strings. http://www.geocities.com/physicsquestion2007 Has anyone seen any publications or authors who support this idea? Chris Walters