Amplitude Definition and 825 Threads

Homework Statement A block on a spring if pulled to the right and released at t=0s. It passes x=3.00 cm at t=0.685s, and it passes x=-3.00 at t=0.886s. a. what is the angular frequency? b. what is the amplitude? Homework Equations w = 2pi / T w= sqrt k/m The Attempt at a...

1. What is the amplitude of the pendulum's motion, in meters? (see attached graph) Given: angular frequency=1.26rad/s 2. T=2pi(L/g)^.5; a=-w^2(x); s(t)=Acos(wt+phase); theta=s/L 3. I almost don't even know how to start.. The confusing part I believe is the graph. The max angle...

How would I work out the pitch circle and number of teeth required to move the mechanism a certain amplitude? Looked over 4-5 sources for pitch circle, but cannot make sense of it..

Hi, does anyone know how to calculate the amplitude of a wave knowing the frequency and wavelength

Homework Statement A 340 g mass is attached to a vertical spring and lowered slowly until it rests at a new equilibrium position, which is 30 cm below the spring's original equilibrium. The spring is then set into simple harmonic motion. What is the period of the motion? Homework...

Homework Statement A beam of unpolarized light with intensity 30 watts/m^2 passes through a polarizing sheet. What is the electric field amplitude of the transmitted beam? Homework Equations Ia=Ipcos2\Theta Ea=Epcos\Theta Ip=Io/2 The Attempt at a Solution I solved the first...

If the lithosphere were suddenly removed, would the earthtide amplitude of the mantle be larger than the .25m or so now measured for the lithosphere?

Homework Statement Two speakers at (x,y,z)=-L,0,0 and (x,y,z)=(0,-L,0) Find the amplitude at all positions in the plane x=y Homework Equations The waves are given by: \tilde{f}_x(\overline{r},t)=\frac{A}{r_x} e^{i(kr_x-\omega t)} \tilde{f}_y(\overline{r},t)=\frac{A}{r_y}...

Can i know whether the amplitude will change after unpolarised wave passes through a polariod?

All right, I don't have a problme with the concept, just a specific question. Is the absolute value of the amplitude abs(r^2 + (xi)^2) or abs(r^2) + abs((xi)^2) Or, to put it in a simpler way - Do you absolute the value of the square of the imaginary part? The difference would be, say...

Hi, this is my question: suppose that at time t' our system is in the state | \psi(t')\rangle The probability for the system to be in the state | \phi\rangle at the time t'' is the norm of \langle \phi| \psi(t'')\rangle This in the Schrodinger picture. But how i can write the same thing in...

I'm just coming to terms with the simple ideas of QED, and I was wondering that if based on these ideas of amplitudes, and let's talk simply (please) about the hands of the stopwatch turning... Can we conclude from that there is some sort of time programmed into all subatomic particles? I mean...

in michelson interferometer, does amplitude of of two waves is divided. i mean one wave say from fixed mirror has amplitue say A and the wave from moving mirror has amplitude say 0.8A? can we call this coherent source?

I am so happy to have found this forum. I am trying to understand a concept about frequency entrainment. I remember reading many times that two different, but similar vibrating bodies can lock into a constructive interference regarding their frequencies, however I thought that their amplitudes...

Hi all, It is common knowledge that unpolarized light, when passing through an ideal polarizer, suffers a drop of half its original intensity. But since intensity is proportional to square of the amplitude, can we then infer to say that the new amplitude of light through the polarizer is...

Can tell me the exact relationship between the intensity and the amplitude for a gaussian beam ? I know that I is proportional to |A|2 .. but i want the value of this proportianality constant

If a photon can be graphically demonstrated as a wave with amplitude x, what does the amplitude correspond to on a particle? Is it, it's displacement from its mean position at a given time?

Dear all, Someone could help me to understand how is mathermatically expressed the amplitude of the velocity gradient? For example if vector of velocity is V(Ux,Vy,Wz) The amplitude of the velocity gradient is? : grad(V)= d/dx(Ux) +d/dy(Uy) + d/dz(Uz) Is it fine? Thanks in...

Homework Statement Hi All, I have two MCQ, I could not answer them. All choices seem to be close to each others. I would be so grateful if you could help me. When the compression and expansion is very rapid, the sound is said to be high in: a) amplitude b) pitch c) frequency d)...

Im trying to make my way through Feynman's "QED: Strange theory of light and matter". On page 89 he says: How should I understand this ? Is he referring strictly to the speed of light "C" not "c" in a specific medium , in a transparent medium ? I am kinda puzzled by amplitudes greater than c.

Homework Statement What is the relationship between Wavelength(λ) and Amplitude?Homework Equations V = fλThe Attempt at a Solution Well, i know an increase in frequency will cause a higher pitch, but what happens when the wavelengths increase of decrease?

I have no idea what it means for a probability to be an amplitude. Can someone give me some kind of intuitive explanation of this concept?

Homework Statement A particle moves with SHM through two points p and q 1.2 metres apart. It takes 3 seconds to move from p to q and 3 seconds to move from q to q, i.e. passing q the next time. Find the period of the particle and the amplitude. Homework Equations x = ACos(wt + a) v...

Hi there, I am learning the basics of QFT at the moment. Could someone explain to me, in the case for any number of scalar fields, the difference between correlation functions and scattering amplitudes please? Correlation functions <0|T(\phi_{1}...\phi{n})|0> Does one always write the...

This question relates to Griffiths: Introduction to Elementary Particles, p. 196 The process in question is a neutral pion decay into two photons. It is stated that because the secondary particles are massless, the amplitude for this process is: M(p_2,p_3) where p_2 and p_3 are the momentum...

i need to know if i can convert the high amplitude low frequency based energy to low amplitude high frequency energy based energy in both the case over all power should remain constant.And frequency should be in the range of VHF not in microwave range.

Homework Statement A traveling sound wave causes a variation in air pressure according to the equation: ∆P = 20.0 sin(15.5x − 5.32 × 103t ) where x is in metres, t in seconds and pressure is in pascals. What is the amplitude of the displacement of the air particles caused by this...

My question is with part c, more specifically the calculating of the amplitude part. http://img691.imageshack.us/img691/1750/shmquestion.jpg The answer to the question is: [PLAIN][PLAIN]http://img80.imageshack.us/img80/8921/shmanswer.jpg I do not understand how to arrive at this...

Homework Statement The well is set up exactly like this https://www.physicsforums.com/showthread.php?t=397977&highlight=potential+barrier+inside+an+infinite+square+well. It is basically a infinite potential well with a barrier in the center. Basically I've got solutions for regions 1, 2...

Homework Statement Consider the following underdamped oscillator governed by: u''(t) + ¥u'(t) + w02u(t)=Fcos(wt) (a) Find the ge... (b) The hom... (c) What is the forcing frequency w for which the amplitude R in the previous part attains a maximum? Show that it is always less than...

Hi, in the paper I've attached, they give a method for generating a polynomial g for the amplitude response of a filter that gives arbitrary flatness and roll-off characteristics. \frac{1}{\sqrt{1+g}} And then they say the transfer function can be easily determined from this, but they...

Homework Statement I have a problem where I am given the following values: Angular Oscillation Frequency which I have assigned to omega Spring Constant, which is k The system's kinetic energy in Joules. Phi is assumed to be 0 I am asked to find the oscillation amplitude at a certain...

Homework Statement A 79.8 g mass is attached to a horizontal spring with a spring constant of 2.66 N/m and released from rest with an amplitude of 39.5 cm. What is the velocity of the mass when it is halfway to the equilibrium position if the surface is frictionless? Answer in units of...

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A 375 g air-track glider attached to a spring with spring constant 9.50 N/m is sitting at rest on a frictionless air track. A 425 g glider is pushed toward it from the far end of the track at a speed of 96.0 cm/s . It collides with and sticks to the 375 g glider.a)What is the amplitude of the...

Is it possible to predict theoretically the maximum amplitude of vibration that atoms of a metallic species, like Copper, will exhibit at a given temperature?

1. The magnetic field of an electromagnetic wave in a vacuum is B_z= ( 3.0 uT )*sin(( 1.00*107)x - omega*t) , where x is in m and t is in s. What is the wavelength and frequency of this magnetic wave? What is the amplitude of the E field? 2. wavelength = 2pi/k frequency = f = 1/T =...

Hi, I'm looking through my notes on em waves in dielectrics and the fresnel equations and I've been stuck on this for a while. It states that if the complex amplitude = E0eiΦ is positive there is no phase change. However when the value is negative, the phase change Φ is π.. Why is that...

In the following I am always talking about fraunhoffer diffraction suppose you have two slits in a doulbe slit diffraction experiment which are both exposed to the same plane wave (say the same laser) as the original source of radiation. Usually, we expect that both slits will act as EQUAL...

Homework Statement A 2.10-kg block is suspended from a spring with a spring constant of 280.0 N/m. A 0.070-kg bullet is fired into the block from directly below with a speed of 220.0 m/s and is embedded in the block. Find the amplitude of the subsequent motion. -What fraction of the...

If anyone can advise that would be great. 1. The plane of a 5 turn coil of 5mm² cross sectional area is rotating a 1200 r.p.m in a magnetic field of 10mT. Q. Calculate the amplitude of the induced voltage across the coil Data: 5 turns c = 1200 rpm A = 5cm² B = 10 mT 2. φ =...

Hi, this isn't homework but a practice problem. A particle is simultaneously subjected to three simple harmonic motions, all of the same frequency and in the x direction. The amplitudes are 0.25, 0.20, 0.15, and the face difference between the first and second is 450 and between the second and...

Hi this isn't homework, just a practice problem I already have the answer too for my waves class: z=sin(wt)+cos(wt) Express this in the from Z=Re[Aej(wt+\alpha)] I know how to express sine in the form of cosine, and cosine in the from of a complex exponential, but I don't know how to do...

Hi, here is the question: For part b) I have to find the amplitude of Vc at the resonant frequency with I=1A, I have found Zeq and well here are my equations: \frac{jwL+R}{\ jwRC-w^2LC+1} and I have the equation for w at the resonance:w= \sqrt[2]{\frac{L-R^2C}{\L^2C}} I know at the...

Homework Statement Hi all, I have this project i have to write but i am having trouble getting the necessary materials to aid my writing. The project topic is the influence of crossing angle on amplitude in cable to cable coupling. It is a magnetic coupling problem and i am supposed to design...

Hi, I know the relationship between Vc and the frequency is Vc=I0/(wc)...and if the output amplitude isn't adjusted doesn't this mean that any increase in frequency results in a decrease in voltage? I am asking this because I did a lab and I had to "raise the square wave frequency, but don't...

Homework Statement A gust of wind hits a flagpole and starts it oscillating. After 10 s, the amplitude of its motion has decreased to 25% of its initial value. What is the value of the time constant? Homework Equations xmax(t) = Ae-t/\tau The Attempt at a Solution I know...

Homework Statement Consider an ultrasound beam incident normal to a boundary between two media with the same density, but where the speed of sound in the second medium is 50 percent larger than that in the first. Calculate the ratio between the pressure amplitudes of the incident and...

Homework Statement An oscillator with a mass of 520 g and a period of 0.500 s has an amplitude that decreases by 1.00% during each complete oscillation. PART A : If the initial amplitude is 10.2cm , what will be the amplitude after 43.0 oscillations? PART B: At what time will the energy be...

Hello Every one, When I am looking at the design of a vibration screen, I found that the claims from different source have different equation. Please have a look on the attachment. You can see "Claim 2 " is a more general approach but need to know spring constant k. while "Claim 1"...