Vibrations Definition and 216 Threads

Hi I have a problem in detecting whether string is vibrating or not. I'm going to conduct experiment which will investigate impact of different factors on time of decaying of guitar's string oscillations but I have no idea how to measure when oscillations stopped. Acoustic method doesn't work...

Hi people, I have a question which i hope you helpful guys/gals can help to shed light on. We all know when we strike one end of a solid metal rod with a hammer sideways (i.e. from left to right), longitudinal vibrations will be set up across the length of the rod. Textbooks and websites...

Homework Statement The disk, hvng a weight of 15kN, is pinned at it center O and supports the blck A that has a weight of 3 kN. If the belt which passes over the disk is not allowed to slip at its contacting surface, determine the natural period of vibration of the system. Homework...

Can EM waves falling on a solid contribute towards lattice vibrations? If yes, then i)when is the energy used in lattice vibrations, ii)when is it used in excitation of electron into higher energy level, and finally, iii)when is the energy utilized for slight vibration of the electron...

Homework Statement A mass m=4 is attached to both a spring, with spring constant k=37, and a dash-pot with damping constant c=4. The ball is started in motion with initial position x0=1 and initial velocity v0=8 . Determine the position function x(t). Homework Equations The...

Vibrations and waves 1) A 5 kg mass, m, rests on a frictionless, horizontal, wooden table top, and is attached to one end of a spring anchored at its other end . If the spring has a spring constant=13 N/cm and the mass is pulled back (in the positive direction ) 20 cm and released, to the...

1) A 5 kg mass, m, rests on a frictionless, horizontal, wooden table top, and is attached to one end of a spring anchored at its other end . If the spring has a spring constant=13 N/cm and the mass is pulled back (in the positive direction ) 20 cm and released, to the nearest tenth of a joule...

Waves and Sound Vibrations Question Urgent Please Help?? Homework Statement A mass suspended from the end of a spring vibrates up and down 25 times in 50s. What ar ethe frequency and period of the vibration. Homework Equations F = 1/T T = 2(pie)3.14(squrroot)L/g The Attempt at a...

Vibrations Assignment Please Help! Homework Statement A pendulum takes 0.5s to swing from its hgihest point to the equilibrium position. What is the frequency of the pendulum? Homework Equations f = 1/T The Attempt at a Solution So would it be this? f = 1/T f = 1/0.5 f = 2Hz

Frequency of a Car's Vibrations? Homework Statement When four people with a combined mass of 297 kg sit down in a car, they find that the car drops 2.8 cm lower on its springs. Then they get out of the car and bounce it up and down. What is the frequency of the car's vibration if its empty...

Homework Statement I'm trying to do some numerical stuff with vibrations of H20 and I'm working in mdyne, angstroms, atomic mass units, and angles are given in radians. What would the corresponding unit of time be when I calculate my normal mode frequencies? femtosecond, 10e-15?

Homework Statement Assume that the differential equation of a simple pendulum of length L is L\Theta'' + g\Theta=0 where g=GM/R^2 is the gravitational acceleration at the location of the pendulum. Two pendulums are of lengths L1 and L2 and when located at the respective distances R1 and...

This is for a vibrations course. A force F(t)=Focos(w*t) is applied to a point on a spring located 25% of its length from the fixed end (at the ceiling). I am trying to write out Newton's 2nd for the block. This requires that I find how much of F(t) is transmitted to the block. I am a little...

Homework Statement Tension is maintained in a string as in the figure. The observed wave speed is 26 m/s when the suspended mass is 3.2 kg .What is the mass per unit length of the string? The acceleration of gravity is 9.8 m/s2 . Answer in units of kg/m The Attempt at a Solution can...

Hello everyone, I am a junior Mechanical engineering student with a midterm in my Vibrations I class on Thursday. I've been studying but I'm having some issues really nailing the concepts fundamentally. I feel like I'm stuck in a rut of doing the problem like in the example, but not really...

Is it possible to determine the actual number of vibrations associated with a given photon? Do all photons from similar events have the exact same number of vibrations? For example, do all photons resulting from electrons dropping from the next to the lowest level to the lowest level in a...

Homework Statement A mass m is attached to a spring(massless) that is located inside a massless box. The box is falling under gravity. When the box starts to fall the spring is in it's equilibrium position and the box sticks to the ground when it hits it. -The box is a distance H from the...

I am looking at forced vibrations and I have come across this: (w_max)^2 = (w_0)^2 - (1/2)y^2 Now I am not entirely sure of what the (w_max) is. ANd where does this equation come from? It was simply stated without a derivation. THanks guys!:biggrin:

Hi, I don't understand how to go about solving a problem like this; A weight stretches a spring 3 inches. It is set in motion at a point 4 inches below it's equilibrium point with zero velocity. -Find the maximum amplitude -When does it reach (the first time) it's highest point -Find...

I appologize in advance if this problem will be awkwardly presented, but I'm a biologist, with no talent for physics or mathematics whatsoever. Here goes... At my institution, we are researching communication of certain bugs, which use low-frequency, substrate-borne vibrations as signals...

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) 30 cm C) 40 cm D) 60 cm E) 120 cm Homework Equations L =...

Homework Statement A standing wave is established in a 120-cm-long string fixed at both ends. The string vibrates in four segments when driven at 120Hz. (a) Determine the wavelength (b) What is the fundamental frequency of the string? Homework Equations (a) Lambda = 2L/n The...

When setting up this derivation one assumes a chain of identical atoms. The interatomic interaction between atoms is short ranged and so only affects neighbouring atoms (see Hook and Hall, "Solid State Physics" chapter 2.3.1). The potential V(r) is expanded as a taylor series about r = a to...

Homework Statement Translated from swedish so i hope i get it right... Observe vibrations along the axis of the bond in a hydrogen molecule (H2). For low temperatueres, by which factor does the rms value ("root-mean-square deviation") of these vibrations amplitude change if one of the...

Homework Statement A spring-mass system has a spring constant of 3 N/m. A mass of 2 kg is attached to the spring, and the motion takes place in a viscous fluid that offers a resistance numerically equal to the magnitude of the instantaneous velocity. If the system is driven by an externam...

[SOLVED] Sound waves and vibrations I read a post here on PF dated back in Nov 2003. 'Security' needed some help with his Physics exam... and what a coincidence! I'm also working on that same exam now. PF Admin 'chroot' helped him with the questions... and I got confused with some of his...

Homework Statement A guitar string is set in vibrations at a frequency of 437 Hz. How many vibrations did the guitar's string make while the sound propagated 235 m in the air? Homework Equations V = wavelegth x freq. The Attempt at a Solution I figured out that you do 437 Hz x...

Vibrations and Waves - please help! I'm having trouble with my physics homework. I can't seem to figure out which formula to use to solve a particular problem. "If a particle undergoes SHM with amplitude 0.25m, what is the total distance it travels in one period?" The formulas I have that...

somone could help me to know how to find the normal vibration coordinate of the A1 representation in terms of the coordinates x,y and z of each atomes ( given: we take the carbone atome as a center of the x,y and z axis ).

Homework Statement http://img240.imageshack.us/img240/790/imgso5.th.jpg A hoist mechanism is modeled as shown in the figure. The drum is driven through a gearbox, the mass and flexibility of which is modeled as shown. The load required to be lifted and the cable stifness are also given. Choose...

Homework Statement A 7 metre long string is stretched between 2 walls so that its ends are fixed. It is made to vibrate and it is found that the displacement, y is given by: y = 0.023sin(xpi)cos(0.714 pi t) where x and y are in metres and t is in milliseconds. a) to which harmonic, N, does...

Homework Statement Hello everyone, I'm a bit stuck on this particular problem and i was hoping somebody could give me a couple tips or hints! "consider a linear monoatomic chain where all atoms have a mass M except one which has a small mass m. The force constant is C." First I'm asked...

Hey. In class at the moment we are studying sound. Ive just read about resonance. Now, from what i understand, resonance is the induced vibration in an object from another object which is vibrating at its natural frequency, via contact with air molecules, a sound board etc. Now, the...

y''+ \frac{1}{x}\cdot y' + (1-\frac{1}{x^2})\cdot y=0 Looks simple but it's a trouble.Probably unsolvable (explicitely). Recommendation?

As I was walking to work yesterday, I thought about how each step I took on the concrete sidewalk spread phonons out in all directions. (Let me know if I'm misusing the term phonons.) Which brought me to the question in the title.

Let's consider the simple functional group C=O (carbon double bonded to oxygen). There is only one type of vibration for this group and that's the stretching mode, where C<=>O oscillates back and forth. What exactly is happening during the stretching? Are electrons, and therefore electron...

Sound is just Longitudinal vibrations of air that are detected from objects like the ear. Hence it originates from a vibrator. For humans this vibrator is in the neck in the form of a vocal cord. So sound from humans really comes from the neck and the vibrations of air ascend up the neck and...

I love my vibrations professor, he is simply the best. He always makes jokes in class. In one lecture he showed us a website to buy vibrations mounts from, he said "this website is like american express, don't leave home without it" Then when he was doing something in MATLAB he said, 'you know...

A small fly of mass 0.13 g is caught in a spider's web. The web vibrates predominately with a frequency of 1.0 Hz. (a) What is the value of the effective spring constant k for the web? (b) At what frequency would you expect the web to vibrate if an insect of mass 0.54 g were trapped? I...

Man, that class is really insanely hard. Excuse me, while I go cry. :cry: :cry: My teacher has office hours the day before its due from 3-6. Basically, the ONLY way you can solve the homework, is by getting help from him, because its that hard. He gave us a problem and everyone got...

I'm stuck on question in where I need to set up a system of equations, can someone please help me with it? There are various things in this question which I just cannot figure out so any assistance would be great. Q. A light string stretched to tension T has its ends fixed at a distance 9L...

I need practice problems for Waves and vibrations course. Right now we are doing superposed vibtrations and I don't understand it. The book we have for the class is A.P. French and it has like maybe 10 problems in it and NO worked out solutions. I have REA's Physics problem solver but it doesn't...

The Problem A particle is simultaneously subjected to three simple harmonic motions, all of the same frequency and in the x direction. If the amplitudes are 0.25, .20, and 0.15 mm, respectively, and the phase difference between the first and second is 45, and between the second and...

One end of a horizontal string is attached to a small-amplitude mechanical 57 Hz vibrator. The string's mass per unit length is 4.4 10-4 kg/m. The string passes over a pulley, a distance L = 1.50 m away, and weights are hung from this end Assume the string at the vibrator is a node, which is...

A 0.55 kg mass at the end of a spring vibrates 2.0 times per second with an amplitude of 0.16 m. (a) Determine the velocity when it passes the equilibrium point. I have no idea how to figure this out i mean to figure out velocity ...we use this equstion vmax= 2pi*Amplitude* Frequency I...

Vibrations and Fluid Statics One end of a horizonatal wire is fixed, while the other passes over a smooth pulley and has a heavy weight attached to it. The frequency of the fundamental note emitted when the wire is plucked is 392 Hz. When the weight is completely immersed in water, the new...

Describe two different ways to determine the force constant of a rubber band only a 100g mass, a stopwatch, and a meter stick. I don't really understand what its asking but I don't have many formulas to choose from so I don't really know where to begin. I have like f = 1/T y = A * cos...

help me on my urgent assingment on vibrations & wave 1.Two particles of masses m1 and m2 are attached to the ends of a rigid spring,the natural length of the spring is l and its tension is k.e.Initially, th particles are at rest with m1 at height h above m2 at t=0.mi is projected vertically...

A 500-g block is released from rest and slides down a frictionless track that begins 2.00 m above the horizontal as shown in the figure. At the bottom of the track, where the surface is horizontal, the block strikes and sticks to a light spring with a constant of 20 N/m.find the maximum distance...

Stupid question, not sure waht to say... In a science fiction movie, when a spaceship explodes, the vibrations form the sound nearly destroy a nearby spaceship. If you were the science consultant for the movie, what would your advice be for the producer? Anyhelp would be greatfully accepted!