Vibrating Definition and 137 Threads

If you have a guitar string and you pluck it nothing happens. Not unless it is tensioned by pulling both ends tightly. In string and brane theory do the strings have something that keeps them tensioned? Or don't they need tension to maintain vibrating; unlike normal strings? Are they free...

The diagram accompanying this post shows a cylindrical column bored at right angles to a flat surface. Let’s say the material is a block of brass with a hole drilled in it. The arrow represents a fast moving stream of compressed air. As the air passes over the top of the column a high pitched...

I've heard molecules are constantly moving or vibrating. What is the mechanism behind this? Where does the energy come from, and go? Is it always a function of temperature/pressure?

My questions follow this short preface re: attached photos. Sometime ago in the mid 1960's, a friend had access to a linear accelerator. In the very late evening, we irradiated several plastic blocks of the dimensions ~10x10x2 cm. Individually, the plastic blocks were in a10 MeV electron...

Hello, I know this has already been asked (unfortunately without answer)... learning once again for an exam (quantum field theory) I can't figure out a feature of a very central quantity: the total energy of a vibrating string. Let's start at the string (field) wave equation...

Homework Statement This is a practical experiment. We have to find the factors effecting the period of a vibrating ruler. This entails finding first the period of a vibrating ruler. We have the equipment a ruler, a stopwatch, some stickytape and a pencil Homework Equations The...

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...

How can I calculate potential enegry? I have a interpretation about it, we should use the work that the string does. But there is deformation on dicplacement of the string. waiting for the any ideas.

When considering a vibrating silicon atom. I'm just not sure how to do the conversion o.O

Homework Statement The kinetic energy of a segment of length \Delta x and mass \Delta m of a vibrating string is given by \Delta K = \frac{1}{2} \Delta m (\frac{\partial y}{\partial t})^2 = \frac{1}{2} \mu (\frac{\partial y}{\partial t})^2 \Delta x , where \mu = \frac{\Delta m}{\Delta x}...

In school yesterday I was doing a practical and when I moved a small 1.5T block magnet near a rheostat the magnet started vibrating, why does it do this?

Homework Statement having my brain fried with some dynamics problems for uni and my lecturer is on holiday so I don't have anyone to ask. Currently working on un-dampened vibration and simple harmonic motion and I can work out basic questions such as a weight hanging on a spring but when it...

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

Homework Statement A vibrating string vibrates at 100Hz in oxygen.What is the frequency of its vibration in Hydrogen?[assume same temperature and pressure] Homework Equations The Attempt at a Solution Equating the velocities of sound gives 400Hz...But what pokes me is that the...

Homework Statement A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. Homework Equations I really am not sure how to approach this using an equation, tried to use...

Finding the vibrational motion of a rod. A uniform rod of length l is compressed from both ends so that its new length becomes l(1-2 \epsilon). The compression force is then removed and the rod is left to vibrate freely. Find the subsequent vibrational motion of the rod. What are the...

Hi, thank you for reading this. The question is; "A guitar string 60.0 cm in length, with a diameter of 1.40 mm and a tension of 289 N, emits a note with a frequency of 147 Hz. Find the frequency in each of the following situations" d) The string produces the third harmonic of the 147...

Hi. Im having some problems with conceptually understanding vibration. I understand that every object has its natural frequency at which it tends to vibrate when disturbed. What I am not fully understanding is how an object can have multiple natural frequencies. Why would an object vibrate...

1. A wave whose particles vibrate perpendicularly to the direction it is traveling is called transverse wave. Here is my question, in the mechanical waves, I am sort of confused with 'wave' and 'particles in the medium'? Which one is really vibrating? It is said that sine waves describe...

Homework Statement This question arises from partial differential equations work, but concerns introductory-level physics. The interpretation is of solutions representing the displacement (a function, u(x, t), of position and time) of a vibrating bar, fixed but hinged at each end. My...

If something hit the Earth billions of years ago and caused a molten blob to be released from it,and this blob settled into a spherical shape,after vibrating a lot,could the moon still be vibrating because of a formation process like this?

From what I've seen, standing waves (which are really cool looking) have nodes (no displacement) at either end. What would happen if antinodes were at the ends instead of nodes? What could you do to make this happen? hmmm...

Hi i need some help with a differential equations problem. The question is:- (w/g)y(double prime) + ky(single prime)+cy=F(t) w= the weight of the object attached to the spring g=32 k= damping factor c=spring constant F(t)= the external force on the system. A 64 pound weight is attached to...

Electro magnets / DC / metal wire / vibrating? Hi, just a very basic question: I just tried making my own electro magnet (copper coil, steel core, connected to a 12V 2A DC power source) and i noticed that when i hold a metal wire (or just anything that's normally attracted by magnets) in...

is the vibrating energy of a tuning fork the same as the oscillating energy of a tuning fork?

Simple Harmonic Motion-Finding the distance traveled by the vibrating object? Hi, I would really like to know if my solution to the following question is correct, I would really really really appreciate it. A hanging spring stretches by 35cm when an object of mass 450g is hung on it at rest...

A vibrating tuning fork is held above a column of air [...] The shortest length of an air column that produces resonance is L(1) - 0.25 m. The next length that produces resonsnace is L(2) - 0.80 m. 343 m/s is what I will use for sound. How can I find the original frequency of the tuning fork...

hey, i need some help for this question/ Question: A wave passes by two little decoy ducks which are vibraing in opposite phase. They are 1.5m apart. I've two possible wave lengths for this situation. So I am guessing you have to make up a frequency and velocity, so i was going to use...

Hello everyone, I'm a undergraduate student in the field of physics. I'm working toward a BS in Physics from University of North Carolina at Wilmington. I've been thinking about string modes of resonance lately and wonder if the theory allows strings to stop vibrating or change resonance...

Dear friends, I need some help with transversal waves, to be precise: the vibrating string. I’ve been given many mathematical representations of what can be a wave (e.g: 10(x^2-v^2*t^2) or this one, 5 Sinx cosv*t) I have to argue which of them can be a solution of the vibrating string...

Which of the following values would NOT be sufficient to determine the tension force in a string vibrating at its fundamental frequency? a. wavelength, mass, and freq. b. wave velocity, mass, and wave length c. masss, wave velocity, and string length d. string length, freq., mass e...

A string 3.2 m long and with a linear mass density of .008 kg/m is kept under tension so that traveling waves propagate at 48 m/s along the string. The ends of the string are clamped and the string vibrates in its third harmonic with an amplitude of 5.0 cm. How much energy is stored in this...

Hello, I need help or guidance. 1. What are the laws of vibrating string? Does it have something to do with f = (1 / 2L) (T / u)^1/2 where f is frequency, T is tension and u is mass per unit length of the string? 2. What method can I use to determine if the string has the same...

Once, again I find myself in need of a little help. Any hints/tips would be well appreciated. In the arrangement shown in (attachment), a mass m can be hund from a string (with a linear mass density of .002 kg/m) that passes over an ideal pulley. A string with a length of L=2 meters is...

Hello ^.^ Here is my question~~ " A vibrating string fixed at both ends displays a standing wave pattern. An example is shown in picture below. If an electron is confined to move in one dimension between two fixed walls, one of its allowed wave functions looks exactly like that in...

I am trying to understand the relationship between mass, tension and length in a vibrating string such as would be found on a violin or guitar. If the string has a uniform gauge throughout and is kept at a constant tension, then reducing the length by 1/2, for example, will cause the the pitch...

if I drop a vibrating 440 Hz tuning fork down the elevator shaft of a tall building and when I hear a freq. of 400 Hz, is it possible to determine how far has the tuning fork fallen? My friend said yes but I think no. Am i right?