Vibrations Definition and 216 Threads

Author: Dr. Donald Luttermoser of East Tennessee State University

ive read this before and I am checking up on it again now. i mean, does skin really exist. on a subatomic level, when you break it all down, isn't it just energy, just supposedly atoms, which are energy right? is the skin, blood, hair, the world, just a vibrational frequency of this...

An infinite string vibrates according to the homogenenous wave equation u_{tt}-u_{xx} = 0 with initial data given by u(x, 0) =f(x) and u_{t}(x, 0) = g(x) for -infinity<x<infinity where both f and g are smooth functions that are positive on the intervals -4<x<-3 and 2<x<3 and both zero...

I'm currently studying vibrations and frequencies. I know that humans can hear from a range of 20Hz-20kHz. I was wondering if sound energy could reach a frequency where it was no longer really sound. Is this possible?

I've run a search through amazon and I found that basically there are only 2 books about waves and vibrations: 1. 'Vibration and waves in physics' by Main, which looks good judging from the table of content 2. 'Vibrations and Waves' by French, which is the book I used for my W&V class but...

A spring is stretched 6 inches by a mass that weighs 8 lb. The mass is attached to a dashpot mechanism that has a damping constant of 0.25 lb-sec/ft and is acted on by an external force of 4cos(2t) lb. a) Determine the steady-state response of this system b) If the given mass is replaced by...

How far from equilibrium will a 45 g mass with amp. of .35 m for a spring (k = 21 N/m) undergoing simple harmonic motion have a speed that is half its maximum velocity? a. .3 m b. .45 m c. .7 m d. .92 m e. 3.5 m Choice B is wrong. Use v = v_max*sqrt[1 - (x^2/A^2 m)] Do I use...

Why do strings vibrate??

Hi I have two questions to ask and hopefully someone could help as I am getting little help from my college and work collegues 1) The work done by an air compressor is given by W = K [ (p1/p2)^(n-1/n) + (p1/p2)^(n-1/n)-2] where p1,p2,n and K are all constants. QUESTION - show that...

A guitar string is 90 cm long and has a mass of 3.6 g. From the bridge to the support post (= L) is 60 cm, and the string is under a tension of 520 N. What is the frequency of the fundamental and the first and second overtone? :eek:

Need help please...I am having trouble with this question... :confused: A mass m at the end of a spring vibrates with a frequency of 0.88 Hz. When an additional 600 g mass is added to m, the frequency is 0.60 Hz. What is the value of m?

I'm trying to design a vibration absorber that will reduce the vibration of a machine by about 60%. I found the equations of motion of the machine without the absorber to be.. m1+x2"+ k1*x1+k2(x1-x2)+C2(x1'-x2')=Fo*sin(wt) and the absorber alone to be.. m1+x2"+k2(x1-x2)+C2(x2'-x1')=0 How...

Does ESP, telekinesis, pre-sight, ... exist? I understand that ESP is rejected by probably 90% of the posters here just because they don't accept is from a pure materialistic point of view. All depends however what is matter? Today physics confirms and most of use understand that matter...

I am curious to know that if a mass on a spring undergoes SHM. when the mass is at its MAX displacement from equilibrium, its instantaneous velocity is what? is it zero! can someone explain? Dx :wink:

I would like to think that: vibrations do not come from thermal energy. A spring with two masses at each end of that spring do not vibrate due to thermal energy of the air around. That system vibrate because :when the spring is stretched, it creat a force pulling the two masses toward each...

Why do the particles of substances vibrate? Just where does that constant energy come from?