Threads Tagged with dimensionless Thread / Thread Starter Last Post Replies Views Forum I have been reading about dimensionless numbers. My question is: are there any natural dimensionless numbers? All... Nov8-13 10:03 PM Vanadium 50 16 683 General Physics 1. The problem statement, all variables and given/known data Convert the effective potential to a dimensionless... Oct16-13 02:09 PM Chestermiller 5 256 Advanced Physics Homework Consider the following commutator for the product of the creation/annihilation operators; = (2m(h/2∏)ω)^1 =... Oct10-13 09:13 PM lukka 2 500 Quantum Physics Is it within the realm of physics or cosmology to refer to a dimensionless void that may have preceded the big bang? ... Oct7-13 12:56 PM bapowell 7 728 Cosmology I'd like to know the dimensionless parameters affecting a counter-flow induced draft cooling tower's performance, or... Apr1-13 10:17 PM Chestermiller 1 549 Mechanical Engineering suppose we have ab why must 'b' be dimensionless? Mathematicians have defined crazy things over the centuries so... Feb8-13 03:10 PM Mark44 8 973 General Math Hello, I was wondering if the following idea had been proposed in one form or another within a scientific... Jan30-13 02:22 PM Alyx.Vox 14 870 Special & General Relativity Hi, I have a problem with measuring cooling performance of a car on a chassis dynamometer. But maybe I should start... Jan23-13 02:57 PM Zirkus 4 688 Classical Physics 1. The problem statement, all variables and given/known data In the chemical reaction problem, assume that the... Sep12-12 06:48 AM clamtrox 1 421 Calculus & Beyond Homework 1. The problem statement, all variables and given/known data There is not really a problem, just a question which i... Aug18-12 03:14 PM rude man 1 326 Advanced Physics Homework Firstly, my question is - why do we use dimensionless quantities? Next question, I would like to know the physical... Jun4-12 09:18 AM Studiot 8 2,709 General Engineering Why are pure numbers like 1 , 2 , 3 .... dimensionless and Avogadro's Number, Plank's Constant, Gravitational Constant... Apr17-12 10:58 AM Whovian 5 1,125 General Physics I have a physics project, but how do I express the uncertainty of a dimensionless quantity? E.g. how do I express... Mar3-12 05:12 PM BluFoot 1 746 Introductory Physics Homework Hi:) A question that I don't understand, and my feeble attempt to answer it. Can anybody give any heads up on this... Sep15-11 12:26 PM J-Girl 2 2,266 Introductory Physics Homework Please teach me this: In QTF theory book of Schoeder say: In nonlinear sigma model L=\intdx\frac{1}{2g^{2}}(\delta... Sep14-11 12:49 AM ndung200790 5 1,132 Quantum Physics 1. The problem statement, all variables and given/known data This is for a third year Nonlinear ODE and Chaos... Apr11-11 03:23 AM mwrigh58 0 1,253 Introductory Physics Homework I was just daydreaming for a few minutes about the energy eigenvalue equation H\Psi = E\Psi. Say H described a... Mar27-11 11:40 AM grey_earl 1 837 Advanced Physics Homework I have a problem that might sound simple, but has been bugging me for months. In a physical equation, the units are... Mar4-11 11:28 AM puzzler7 3 2,152 General Physics In Dimensional analysis if L=Lenght why is L/L=1 (a dimensionless number), and not just nothing more than L/L ? It... Dec25-10 11:18 PM Rap 58 4,875 General Physics 1. The problem statement, all variables and given/known data A resistor with resistance R and a capacitor with... Dec8-10 12:06 AM themonk 2 1,148 Introductory Physics Homework Recently I found this: Note the number - 15360*pi = 48254.... This is a biggest number in Planks units I have... Nov16-10 09:30 AM thubsch 13 1,889 Beyond the Standard Model Hi, I am just writing up my MSc thesis and want to explain the dimensionless hubble parameter that I have been... Aug10-10 12:55 PM nicksauce 2 1,791 Cosmology 1. The problem statement, all variables and given/known data The volume flow rate of a fluid V ̇ through a circular... Aug5-10 01:08 AM buddy21 0 608 Engineering, Comp Sci, & Technology Homework In describing physical reality, we have two classes of constants, the dimensionless and the dimensionful. ... May29-10 05:46 PM apeiron 23 4,432 General Discussion I can not transform the dimensional Schrodinger equation in dimensionless, please help! ... Mar1-10 05:40 AM krishna mohan 3 868 Quantum Physics (a) Is it true that if the mass flow rate of a gas is low, say 2g/s (grams per second), the friction losses and other... Feb15-10 08:55 AM minger 4 3,391 Mechanical Engineering My professor yields this equation. d^2z/d0^2+1=0. This problem has to do with heat conduction. So a plane sheet... Feb10-10 03:36 AM torquil 1 2,609 Differential Equations I know that we do not measure or quantify Inertia , but it always acts in a direction opposing the cause for which a... Jan4-09 02:00 AM zd1899 20 1,807 General Physics I'm inclined to believe that radius is a measure of length, so doesn't that mean it's dimensional? I am probably... Jun21-08 08:56 PM .NoStyle 3 1,059 Introductory Physics Homework Hi im new to quantum physics and i have been asked to find the dimensionless schrodinger EQ for a wave function it... Jan21-08 07:28 AM rt11 2 1,750 Advanced Physics Homework For a free particle, show that the time-independent Schrodinger equation can be written in dimensionless form as ... Aug3-07 03:47 PM nrqed 10 5,180 Advanced Physics Homework 1. The problem statement, all variables and given/known data Define a dimensionless radial coordinate as ... Jul19-07 06:55 PM Dick 13 2,257 Calculus & Beyond Homework Given: slope of the graph of ln(temperature dimensionless) vs. time slope=-0.0416 -t/tau = ln(temperature... Jan31-07 08:48 PM berkeman 2 19,232 Introductory Physics Homework http://arxiv.org/abs/astro-ph/0511774 Dimensionless constants, cosmology and other dark matters Max Tegmark (MIT),... Dec3-05 01:23 AM rtharbaugh1 9 3,327 Beyond the Standard Model In cosmology and fundamental physics some papers are written in a system where time, mass, and length are... May10-03 07:41 PM Tyger 8 1,465 General Astronomy