Classical Definition and 1000 Threads

Homework Statement http://i42.tinypic.com/20adicz.jpgHomework Equations torque=rxF angular precession velocity=Δtheta/Δt assume that Δtheta=ΔL/Lsin(theta)The Attempt at a Solution I can conclude that the subsequent motion of the top will be an anti-clockwise circle about the origin but would...

Homework Statement a)Two people are holding the ends of a plank of length l and mass M. Show that, if one suddenly let's go, the initial acceleration of the free end (aD) is 3g/2. (7 marks). Moment of inertia, I, of the plank about its centre of mass is given by I=1/12(Ml2) b)Show...

Homework Statement suppose every charged particle carried electric and magnetic charge in the universal ratio Gk/Ek=a. is there another way of looking at this situation in which we would be unaware of magnetic charge?

Recently I have been troubled by several things which have been stated in my school physics classes, mainly concerning the classical kinetic energy formula and other formulae derived from it (as well as the 'Work Energy Theorem'). The classical formula for kinetic energy '(mv^2)/2' was first...

Homework Statement It's not a direct question, but it's an implied part of a larger question: can classical waves experience simple harmonic oscillator potentials, like a mass on a spring does? Homework Equations The Attempt at a Solution I'm thinking no, since I can't come up...

Dear all, I'd like to specify meaning othe relaxation phenomenon on example in some classical system. For example in Wiki I found example of dampled oscilator where the relaxation time ( the time is needed for the system to return to the equilibrium fluctuation pattern) add exponential decay...

"The" Classical Path, QM Path Integrals and Paths in Curved Spacetime Hey Guys! I've got an exciting question! It's been burning on my mind for years, but I think I can formulate it now. It's not so much a specific question, but rather a physical story which perhaps this thread can uncover...

Homework Statement A mass m1 is attached to a fixed spring on a horizontal surface and attached across a pulley (ignore the pulley mass) to another freely hanging m2. Write the Lagrangian in terms of a single parameter. Find the equation of motion and determine the frequency of oscillation...

I was recommended this by a friend. I'm going to get K&K but I was wondering what you thought of this book if you have read it. Is it good for beginners? Comprehensive? General comments? Thank you, Tridian

My understanding is that a classical idealized particle, moving in one dimension, with momentum p and kinetic energy T comes into contact with an infinite step-function potential V, there will be an (instantaneous) elastic collision - the particle's momentum becomes -p, so its energy remains...

Hi guys, Just ran into a debate with friends about this topic. We were discussing whether the scope of pure sciences (in particular, Classical Physics)decreasing over time? Has it decreased till date? The fact that newer questions posed now a days are tougher than the times of Newton and...

John Taylor "Classical Mechanics" Chapter 5, Problem 29 Homework Statement An undamped oscillator has period t(0)=1 second. When weak damping is added, it is found that the amplitude of oscillation drops by 50 percent in one period r1. (the period of the damped oscillations defined as time...

Homework Statement A massless wire hoop of radius R is rotating in a horizontal plane about its central point with constant velocity ω. There is a tube of negligible mass pinned across the hoop on a line passing through the central point. Inside this tube is a spring of negligible mass with...

Homework Statement Consider the multiplicity of a classical gas of N non-interacting molecules (not necessarily monatomic). Since they don't interact,their positions are not correlated, so the multiplicity of each will be simply proportional to the volume, with the result that the total...

Wheres the limit between quantum mechanics and classical mechanics. I mean,when can I expect quantum behavior on a system, is it depends on the system size?Tempature? Something else...and if so what are the numbera for those limits. As we know in nature everything is continuous, so, the...

Homework Statement a particle of mass m moves on the orbit r= a cos(θ), a>0. Find the force acting on the particleThe Attempt at a Solution I had this formula in my notebook:U(r)= E-(L^2/2mr^2)(1+(1/r^2)(dr/dθ)^2) Using it I got U(r)=E-L^2a^2/2mr^4 and F(r)=-dU/dr= (-5L^2a^2/2mr^5)...

John Taylor "Classical Mechanics" Chapter 3, Problem 7 1. Homework Statement [/b] The first couple of minutes of the launch of a space shuttle can be described very roughly as follows: The initial mass is 2x10^6kg, the final mass (after 2 min) is about 1x10^6 kg, the average exhaust speed is...

Consider the classical wave equation in one dimension: \frac{\partial^2 \psi}{\partial x^2}=\frac{1}{v^2} \frac{\partial^2 \psi}{\partial t^2} It is a linear equation and so the set of its solutions forms a vector space and because this space is a function space,its dimensionality is...

Homework Statement When engine was turned off,boat with mass m was moving with speed v_0. The force of friction F=-\alpha\nu-\betav^2. How long it would take to drop speed of boat 3 times? Find the distance which the boat will travel in this time? Homework Equations The Attempt...

I've been reading through the posts on this forum that deal with the photoelectric effect as evidence for the quantization of the EM field. In all of the introductory texts I've read, the cut off frequency and the dependence of the photoelectron energy on the frequency of the light are...

Why is it that in the damped simple harmonic equation, the force constant can take on all values, but the force constant corresponding to the classical harmonic oscillator potential in the Schrodinger equation can only take on discrete eigenvalues?

Hey all, suppose there's a particle with Potential Energy : U(x) = A*[ x^(-2) - x^(-1) ] , where A is a constant. I'm supposed to find the energy required to make the particle go from periodic movement to unlimited movement. First thing I did was U '(x) = 0 to find the balance points, now...

Hi! Is there a way to calculate the classical orbital elements for a satellite or space shuttle around Earth using Matlab? I would like to get started with it since it is something that I've not tried before. so plese help Best regards

Homework Statement I'm so confused please help :\ Show that the contribution to the total energy from molar internal energy Um reverts to the classical expression at high T.Homework Equations Classical: Um = 3NakT Quantum Um = 3NAhv/e^(hv/kT)-1 The Attempt at a Solution Manipulating...

What type of physicist works in the field of Classical Mechanics? And yes, this does encompass the general theory of relativity.

Homework Statement If anyone could help me with this classical mechanics exercise I would be very grateful! The exercise is as follows: The muon (μ) is a particle with mass mμ=207me, with me being the electron mass. The pion (∏) has a mass of m∏=273me. The pion can decay into a muon...

The below picture is from my book's derivation on the equations describing waves in matter. But problem is: I don't understand the solution of the differential equation - or "difference" equation (whatever that is). How is it solved with the proposed solution? If I plug it in I don't get...

Homework Statement A block at t=0 is at the bottom of the plane and is projected up an inclined plane with initial speed v0. The plane's acute angle is θ above the horizontal, and the coefficient of friction is μ between the block and plane. Find the time (t) and velocity (v1) of the...

Am I "ready" for Classical Mechanics? Hello again, PF. I have a question about the Classical Mechanics course I'm taking this coming fall. Thanks to having a few cruddy enrollment times in the past year, I've been taking my courses a bit out of order, but without any problems or conflicts...

According to my prof, increasing intensity of the light source in a photocell for the photoelectric effect does not increase the kinetic energy of photoelectrons emitted. Instead, the number of electrons emitted (and current) increases. Changing the colour of the light causes an increase in...

Hi, I am trying to gain a better understanding of the classical model of electrodynamics, so what I mean by this is, using the idea of dipoles and electron movement to understand electrodynamics. More specifically, I'm studying plane waves, and I can't understand why when a plane wave hits a...

Homework Statement Problem 27 Experiment needed first: The hallmark of inertial ref. frames is that any object subject to 0 net force travels in straight line at a constant speed. Consider the following experiment: I am standing on the ground (which we shall take to be an inertial frame)...

EDIT: Okay I don't expect an answer for this because of my crappy attempt at LaTex, i'll work on making it look prettier sorry Homework Statement If the kinetic energy of a particle is equal to twice its rest energy, what percentage error is made by using p = mu for the magnitude of its...

Homework Statement The two vectors a and b lie in the xy plane and make angles (alpha and beta) with the x axis. a. by evaluating a dot b in two ways prove the well known trig identity cos(alpha-beta)=cosalphacosbeta +sinalphasinbeta Homework Equations adotb=abcostheta=axbx+ayby The...

John Taylor "Classical Mechanics" Chapter 3, Problem 1 Homework Statement Consider a gun of mass M (when unloaded) that fires a shell of mass m with muzzle speed v. (shell's speed relative to gun is v). Assuming gun is completely free to recoil (no ext. forces on gun or shell), use...

Homework Statement According to classical electromagnetic theory an accelerated electron radiates energy at the rate Ke^{2}a^{2}/c^{3}, where K = 6*10^{9} Nm^{2}/C^{2}, e = electronic charge, a = instananeous acceleration, and c = speed of light. a) If an electron were oscillating along...

Hello. I found it very strange that matter behave as a wave and started thinking a lot... I have seen a video previously explaining this experiment and when I saw this: In red is the first path and in blue the second path. Could it be the answer? At the end of the video, in the screen of...

Greetings, Two or three years ago I studied mathematical logic using Kleene’s “Mathematical Logic”. I was thinking about the subject again recently, and I have a question regarding what research has been done into non-classical logic. I am having difficulty phrasing my question, so please let...

hi i know what is coherent state, but i read this text in an article and i don't understand this " if we wish to describe long range macroscopic forces, only bosonic fields will do, since fermionic fields cannot build up classical coherent states. " can you explain it for me, how...

So there's a new paper out by Yves Couder's group that observes quantum mechanical-like wave dynamics by averaging the long-term dynamics in a purely classical system. In other words, it's hidden variables. http://web.mit.edu/newsoffice/2013/when-fluid-dynamics-mimic-quantum-mechanics-0729.html...

How are classical formulas in physics (such as p = mv, or kinetic energy, or maxwell distribution of speeds) treated with the appropriate relativistic correction/modification? Is it done by using the Lorentz transformation equations? Could anyone give me a few examples of relativistic...

This is an image of Classical Dynamics of Particles & Systems, chapter 1 In deriving the equations for the rotation of a coordinate system I understand the equations 1.2a & 1.2b b, but why is the projection of x2 on the x'1 equal to ab +bc and why is the vector de equal to the vector Of? I...

Consider the following. You have an electron of negative charge orbiting a proton of positive charge at some distance R (i.e. a classical hydrogen atom). I understand the hydrogen atom is unstable under classical physics because the accelerating electron loses its kinetic energy as...

My graduate course (2 sem) follows Goldstein (All chapters ). Can anyone suggest me a book with solved problems on such advanced topics?

1. Calculate the internal energy of a system of N classical anharmonic tridimensional oscillators of potential energy V(r) = k*(r^a) with k>0 a>0 and r = abs(r). Verify the result with a = 2 .

Relativity says photons have energy E=pc. Classical physics says E=1/2 pv. There seems to be a factor of 2 missing in one case or the other or does the energy formula change as the speed of light is reached? There must be a simple explanation but I have not found it yet. I did not know where...

Every year in my country there are competitions in physics(and in physics other sciences).Competition in physics is divided in three categories A(classical mechanics), B(oscilations, waves and electromagnetism) and C(optics and nuclear physics). I started competing last year in clasical...

I am a little confused at the description of quantum information, even though I more or less understand the concept of a qubit as being a superposition. That which confused me was a phrase saying that the quantum information is the classical information that can be retrieved. But one can only...

Homework Statement Consider the classical system of a mass of one kg attacked to the ceiling with a spring constant k=50N/m. The mass is held at rest such that the spring hangs vertically but is not extended. The mass is then released and falls under gravity. Neglect air resistance. 1...

I have a question regarding the parameters that reduces the Planck distribution to the Rayleigh-Jeans distribution. According to the Planck distribution, the average energy in a unit volume in the \nu frequency mode of a blackbody radiation field is <U> = \frac{h\nu}{e \frac{h\nu}{KT} - 1}...