Young Definition and 189 Threads

I am currently trying to demonstrate by hand the various Clebsch-Gordan coefficients for the product of particles of various spins, using (mostly) the formalism of Young tableaux. For simple cases, so far, it has worked okay (that is, ½x½) , but trying for bigger ones (1x½, 3/2x½ and 1x1, for...

Hi, I don't know what is the generation number of our solar system. But it is certainly not the first generation of stars. Because the heavy elements that made up the planets must have been synthesized during the supernovae of earlier generation stars. Let's assume a star massive enough to...

Hello, I was wondering if I could get any help with the following question/thing: Why does a stream of photons (let's say that one is fired every 3 seconds) at a double slit as shown in Young's double slit experiment create an interference pattern although there is no interference because the...

I have started a home study course in mechanical engineering, I now realize that I should have started with a math’s course but any way I have a question that I could do with some help with. A designer wishes to calculate the thickness (diameter) of a steel cable for suspending a passenger lift...

Why do so many people my age express such a dislike for country music? It's excellent music, in my opinion, yet I've noticed that saying I like country has at times earned me a badge of dislike.

Young moduls can be given as: Y=(F/A)/(dL/L) but in area i am confused because sometine for cylindrical shape it is taken as 2(pi)r*L and sometime simply (pi)r^2. Please deffrientiate these cases:

Homework Statement I've been looking at Paul Langacker's "Grand unified theories and proton decay" for a course on GUTs. I'm stuck with the 16 irrep of SO(10), particularly I don't understand how to prove the statement that the 16 decomposes as 5* + 10 + 1. I can see why it's useful physics...

out of interest does cross sectional area change when a force is applied (lets say I had a wire and I applied a force to it, the wire would stretch ) does its cross sectional area change

Jethro Tull, here's the short version https://www.youtube.com/watch?v=MBnyT2L6Okk https://www.youtube.com/watch?v=W7-EEGiABBU http://www.youtube.com/watch?v=rGQsC3qZeL4&feature=related https://www.youtube.com/watch?v=rGQsC3qZeL4&...

Hi, does higher young modulus means higher rigidity of a solide? Regards,

Must a "Hot Jupiter" be relatively young? A large proportion of exoplanets so far discovered are "hot Jupiters," large gas giants orbiting very close (< 0.1 AU) to their primaries. It seems to me that a gas giant orbiting at such a close distance ought to experience significant friction as...

I remember when I was young I saw people emptying the water from their tanks using a flexible tube(without any pumps or other mechanical device). If I am not wrong, you first fill the tube with a little bit of water and make a U shape,then you close the 2 ends with your thumbs and put the tube...

Is it possible for people under 30 to have excellent credit scores? I just checked mine and it is only in the 65th percentile. With a couple credit cards and loans, I've paid all my bills on time. I think what is hurting me is average credit age. My average loan and credit age is only 5...

When i surf internet, i have meet a photo about Stephen Hawking and i have surprised when saw the Stephan Hawking standing. http://bit.ly/9VXk0Y

Homework Statement A particle of mass m is attached to one end of a light elastic string of natural length a and modulus mg, the other end of the sting is attached to a fixed point O on smooth horizontal surface. The particle is released from rest at horizontal distance a+L from O...

Hi I have a problem with the following question: A steel violin string has a cross-sectional area of 0.2*10^-6 m^2 and is under tension 83N. If its length under tension is 35cm, find its original length. I can not seem to solve the question without needing the value of young modulus...

Erm, why do you use a single slit initially? - to produce 2 coherent non-identical sources, but I don't understand why you can't just diffract the beam through the double-slits initially, I thought this would produce 2 coherent sources. Thanks in advance... =]

If you disregard the diffraction pattern, the intensity distribution of the Young experiment with light (take two slits) gives an infinite intensity (in the sense that it doesn't decrease for an infinite height: the intensity distribution is given by a cos² function with a constant amplitude)...

Hallo, maybe I should not be writing here but I need more opinions on prescribing statins to a child at age 5. We have a family heredity of high cholesterol level (my mother, both my sisters an myself and now my son). My son was firts tested at age three when I told the pediatrician that we have...

The current Young optical experiment induces interference between 2 waves when the two intermediary holes are opened and interference dissapears as soon as an active detection system is used to know by which hole the particle flied thru. Surprisingly, even when particles are sent one to one the...

Homework Statement The Young's double slit experiment is modified, as shown below, by placing a thin parallel glass plate of thickness d and refractive index n over one of the slits. Here a is the slit width in the x direction and b is the slit separation also in the x direction. The system...

in young modulus of a metal bar , we have a horizontal bar on one side we attach some weight so there is some change in angle but no change in length then why it is called young modulus?

I am pretty confused about how to construct states to make symmetric / anti-symmetric combination so I would like to ask some questions. For example, for SU(2), states of three spin-half particles can be decomposed as 2 x 2 x 2 = 4 + 2 + 2, 3 irreducible combination with dim 4, 2, 2. -if...

Hey, Sorry if this sounds mad but I have been searching for a while and I am stumped. I am not very well versed in medical knowledge. I am writing a book in which the main character is terminally ill in hospital. I just can't pick an illness and need some help. I just need some...

Is it just me or is this book complete ****? I've only read the second chapter on velocity and acceleration but it's horrible. The examples use algebraic formulas and are nothing like the assigned problems. I remember one the questions asks to find the initial velocity and initial position of a...

Homework Statement A monochromatic light source is incident normally on a diffraction grating with 600 lines per mm. The beam passes through the grating and the fringes are observed on a screen 5m away. The apparatus is then immersed in a liquid whose refractive index is 1.3. In consequence...

Homework Statement my data as below diameter of copper wire/m 0.025 (mean) Unstretched part = 0.285m mass(m)/KG extension(e)/m 0.1 0 0.2 0 0.3 0 0.4 0.001 0.5 0.001 0.6 0.001 0.7 0.003 0.8...

in the following question, how do i find the changle in AB, the change in AD and the change in AC? http://lh4.ggpht.com/_H4Iz7SmBrbk/Sv_hYT83rYI/AAAAAAAAB8s/7l5YRXMxVfQ/s912/Capture.JP what i have done is used the following \sigmaxx=E*\epsilonxx \deltaAB=\epsilonAB*AB since AB is on the x...

Long story short, I am currently an undergraduate at a public college and I, as high school-ish as it sounds, have a big crush on my former TA. He's funny, cute, and a math grad student, which is EXACTLY my 'type' but those of you who have experience with these types of guys know that they can...

Hi this is my question : people often say that there are a lot more women than men in Russia. if we look at the statistics, it is true. but now, if we look at a age pyramid, and concentrate on young populations, we see with an age pyramid, that in 2005 there is an equal male-female...

As a young future mathematician (senior in high school) I'm having trouble coming to terms with the fact that I'm not going to be the smartest kid even though I pursue math outside of class from pure interest and nothing better to do. I know its only going to get worse when I move to a...

Has anybody had the change to read, "Hamiltonian and Lagrangian Mechanics A Coloring Book for Young Physicists." by Jame Curry? https://www.amazon.com/dp/1420858564/?tag=pfamazon01-20 It looks interesting, but there aren't many reviews on amazon yet. I'm looking for something a little...

Hi, Let me start off by saying I am new to the forums I just discovered them last night and just made an account. I find these forums to be an execellent source of information and guidance to anyone looking to gain knowledge on physics. I'm 17 years old, going to be a senior in high...

Hello, I look for a contest in the US for young people, up to ~20 years about thw whole theme of scientific-research. Is there anything like this?

3 colored species (one species but 3 colors):old and young,young and old and old and young old mate with old youngmate withyoung youngmate withold anyone know I would want to find the percentage number of genes common in the offspring ? you know ? I am so very worried that the whole family...

Hi everyone, I was just wondering what were the mistakes you made along your career path in any of the sciences, and what would you recommend any young person doing to avoid these mistakes...

Homework Statement find the young modulus of copper through calculating the stress and strain, plotting on a graph and finding the gradient of the linear part of the graph Homework Equations ym=stress/strain stress=force/ area strain= extension/length The Attempt at a Solution...

http://news.bbc.co.uk/1/hi/world/americas/7929712.stm I really don't understand why church would go against abortions in these like cases.

Are you interested in earning $100 to share your opinions? We're looking for Chemical Engineers, age 22- 35 to participate in a 1 1/2 hour discussion. We will be hosting focus groups in Houston, Chicago, and Philadelphia, and we need members of AIChE as well as non-members. The...

Hi everyone, I want to know what the difference between bulk modulus and young modulus is? In some papers, it seems that they have compared the value of these two as if they are the same. Could anyone help me with this regard? Regards, Sara

http://www.thesun.co.uk/sol/homepage/news/article2233878.ece" Really young parents!

Problem 3.62, Young and Freedman--On the Flying Trapeze A new circus act is called the Texas Tumblers. Mary Belle swings from a trapeze, projects herself at an angle of 53 degrees, and is supposed to be caught by Joe Bob whose hands are 6.1m above and 8.2 horizontally from her launch point. You...

Homework Statement The cables of length 70m supporting a lift consist of two steel ropes each of 100 strangs giving a total cross sectional area of 1.0 x 10^-4 m^2. Consider a full lift to carry 8 passengers of average mass 75kg. Calculate by how much an empty lift moves down when it is...

Discovery challenges prevailing model! http://www.eurekalert.org/pub_releases/2008-10/nrao-ygm092908.php Astronomers have made the first direct measurement of the magnetic field in a young, distant galaxy, and the result is a big surprise. Looking at a faraway protogalaxy seen as it was...

I used to always wondered why people in my age group were hopelessly passionate and seemed to fall into the stereotype of 'young and restless dreamers' until a few years ago. As I go on in college, I, as well as many other people my age, have to make more and more choices and seriously...

i applied for an auto loan at bestleadinglenders.com and was approved. can anyone take a quick look and tell me if going through with it here is a bad choice?

We know of Daniele Oriti because he has been postdoc in Renate Loll's group in Utrecht (see the Loll SciAm link in my sig) and because we have been following the news about his forthcoming book Approaches to Quantum Gravity: towards a new understanding of space, time, and matter Oriti has just...

Homework Statement I apologize for the blurriness in my title, I couldn't find anything better to fit within the length limit. The problem I'm stuck with, paraphrased, is to derive the formula for the diffraction pattern of a double slit, as found in the Young experiment, from the Fraunhofer...

The book's graphic designer Chip Kidd has sample pages. The book uses public domain pictures from the Hubble Space Telescope collection. http://www.goodisdead.com/index.php?/work/entry/icarus_at_the_edge_of_time_2008_interiors/ By clicking on sample pages at the above link, you get larger...

I happened to see this and thought someone here might be interested It has been accepted for publication in Astrophysical Journal and it suggests a reason for something I didnt know about---there are unexpectedly many young stars clustered around the vicinity of the SMBH at the center of our...