Elementary Definition and 558 Threads

I don't know if anyone has heard of these even more elementary particles, http://en.wikipedia.org/wiki/Preon There even more fundamental than quarks, i was wondering if they are well excepted into the scientific community or if its a very unlikely that they are real.

Hi, I'm currently writting an article for people my age (15-18) about Quantum Physics, it's complexity, it's vast uncertainty and it's applications. However, being only young and just halfway through John Gribbin's 'In Search of Schrodinger's Cat', there are several points I would like to raise...

Hello, I've got a simple question is the product of closed sets closed in the product topology? I think the answer is yes but need to sure

Hi, I am B.E. Mechanical Engg. candidate. But i am crazy about particle physics. I want to do research in atomic and particle physics. Can anyone guide me how to get into research since I don't have physics as my graduate degree. I know i have to do msc and phd but can anyone give guidance which...

These are some of the inconsistencies with physics that should be resolved on this forum. Question #1. Relationship Between Mass and Gravity) Gravitational fields exist in elementary particles but cannot be detected in laboratory experiments because they are too weak. However can...

6 unique experienced persons 2 unique inexperienced persons How many 3-person combinations if at most one in the group can be inexperienced? 6*5*4/3! + 6*5*2/2! is the answer. My answer was 6*5*4/3! + 6*5*2/3! Why does the book divide by a 2-permutation and not a 3-permutation for...

Ok, when it comes to particle spin i know that all protons spin the same, all neutrons spin the same and so on. However i am confused as to whether or not these particles are actually spinning or if this is just a word that means something else like different colors of quarks even though they...

A central figure in one section of the mural is a Latino kid that attends the school. For weeks drivers have been shouting racial epithets as they passed the artists (and children) working on the mural. Sad...

Homework Statement In an early set of experiments, Milikan observed that the following measure charges, among others, appeared at different times on a single oil drop. What value of elementary charge can be deduced from these data? 1) 6.563 x 10^-19 C 2) 8.204 x 10^-19 C 3) 11.50 x...

Is fullerene C_{60} elementary crystal cell or the whole crystal? I do not clearly understand it fom the context? Why is considered most perfect point symmetry form?

What is momentum? At the most elementary level what causes particles to have momentum? Also, does the higgs particle concern only a possible explanation for gravity or momentum as well?

simple magnetic dipole moment with impossible field lines? clueless. Hello, I'm taking a first year university course in electromagnetism. At a certain point we came upon the torque on a current loop in a uniform magnetic field. There we introduced the magnetic dipole moment \overline{\mu} =...

Golden Rule for Decays in Griffiths' "Introduction to Elementary Particles"? Hello, I'm getting a bit bogged down in constant factors while reading Griffiths' "Introduction to Elementary Particles", 1st edition. In particular, I'm having problems with equation 6.15: d\Gamma =...

Homework Statement Estimate the number of low and high mass stars that you expect to find in our Milky Way Galaxy now. Use the following (very approximate but about right numbers) for your estimate: The Star Formation Rate in our galaxy is approximately 1 Solar Mass per year and virtually...

I am looking forward to study Particle physics on my own. Can someone suggest me a book which I can read and understand by myself?

Two basic questions here, thanks and good karma to whoever helps. my questions are: The spin of an elementary particle, is it really the physical rotation of a particle on its axis? and Can I imagine that an elementary particle looks like a three dimensional wave packet laying/distorting the...

I am looking for an easy way to explain to my 2nd grade son which ball will roll down a ramp faster. I have a ramp (more like a trough) set at about 30 deg angle incline. He is going to roll a baseball, pool ball, golf ball, and basket ball down the rramp. He is only 2nd grade so I can't get...

I am aiming to prove that p is the smallest prime that divides (p-1)!+1. I got the first part of the proof. It pretty much follows from Fermat's Little Theorem/ Wilson's Theorem, but I am stuck on how to prove that p is the smallest prime that divides (p-1)! +1. I am assuming that every...

This result came up in my diff eq class the other day: If i = x^2 then x = [(sqrt(2)/2) + (sqrt(2)/2)i]^2 While there aren't a lot of use for complex numbers in this class, I still feel stupid for not knowing it. Another trick that I'd like to learn about is the "complexifying the...

I have a question about elementary matrices, I have matrix A, and I just found A-1, and then the question wants me to write A-1 as a product of elementary matrices. Ok, that's easy, but now the question wants me to write A as a product of elementary matrices, how do I go about doing this...

The first part of the problem is as follows: Any nonempty set of integers J that fulfills the following two conditions is called an integral ideal: i) if n and m are in J, then n+m and n-m are in J; and ii) if n is in J and r is an integer, then rn is in J. Let Jm be the set of all integers...

Homework Statement What is the inverse of this elementary matrix? 2x2 matrix 1 0 3 -1 E= Homework Equations None The Attempt at a Solution This is what I think: 1 0 -3 -1 Is that right? Or do you leave the 3 positive? If so, please explain. Thank you.

Homework Statement A= 1 2 -3 B= -1 2 0 0 1 2 0 1 2 -1 2 0 1 2 -3 Find an elementary matrix E such that EA=B Homework Equations None The Attempt at a Solution I don't know how to start this problem. Please help. Thank you.

It is said on wiki* that "Maximal compact subgroups are not unique unless the group G is a semidirect product of a compact group and a contractible group, but they are unique up to conjugation, meaning that given two maximal compact subgroups K and L, there is an element g in G such that...

Homework Statement Given A = \left( \begin{array}{cc} 2 & 1 \\ 6 & 4 \end{array} \right) a) Express A as a product of elementary matrices. b) Express the inverse of A as a product of elementary matrices. Homework Equations The Attempt at a Solution Using the following EROs Row2 --> Row2 -...

Hello, Given a function f(x_1,\ldots,x_n), the total derivative for x_1 is: \frac{df}{dx_1}=\frac{\partial f}{\partial x_1}+\frac{\partial f}{\partial x_2}\frac{dx_2}{dx_1}+\ldots+\frac{\partial f}{\partial x_n}\frac{dx_n}{dx_1} Now, if the x_i are just variables, can we say that...

If there's no tail rotor, Will the body of helicopter naturally turn along with the main rotor (in the same direction) or spin toward the opposite direction. Thanks! $15 bet with my friend ><

***SOLVED*** Homework Statement A system of particles is at equilibrium. What is the proportion of particles in the ground state? The Attempt at a Solution P(\epsilon_{s})=\frac{exp(-0/\tau)}{1+exp(\frac{-\epsilon_{s}}{\tau})+exp(\frac{-2\epsilon_{s}}{\tau})} Is that right? This is a...

Homework Statement An elementary particle called the omega minus has spin 3/2. Calculate the magnitude of the spin angular momentum for this particle and the possible angles the spin angular momentum vector makes with the z-axis. Does this particle obey Pauli’s exclusion principle...

Is it just me or does just knowing a few physics formulae make first year physics courses ridiculously easy? I have a few sample tests in front of me and just about every single question can be answered by applying 1 of about 10 formulae in one way or another. I always liked physics but only...

Has anyone ever considered the outer event horizon of a point particle (classical electron perhaps...)? Does it make sense to consider it Kerr and charged because of spin? Is it comparable with a Planck length? I know we would need a quantum gravity to deal with it, I'm just curious to see what...

Can anyone provide an elementary argument for why the zero mass of the photon means that it can't be longitudinally polarized? I know of at least one non-elementary argument, which is that if you write down the Proca equation, it only has longitudinally polarized solutions if the mass is...

A lot of apparently innocent elementary functions, like exp(-x^2) or (sin x)/x, have not antiderivatives in terms of elementary functions. I've read that "Differential Galois theory" explains this, and gives an algorithmic method to know if a given elementary function has or has not elementary...

Free elementary particles are lighter than the Planck mass, how can the exist as particles, or are they just Compton particles having a Comton waveleght?

I hope that someone here can answer this question... I have an 18 lb. turkey that needs to be thawed in cold water over 9 hrs., with the cold water replaced every 30 minutes. If I use a container about 3 times the size of the sink, will that allow me to change out the water every hour and...

NOTE: This is not a homework question. Rather, this is a conceptual question I developed as I was reading the book. 1) Aren't we a little heavier than what the scale says (a very miniscule amount) because the buoyant force is equal to p sub fluid times g time volume that is submerged? 2)...

Hello, I need to find some theory about elementary matrices. That are the matrices in the form \mathbf{E}(\sigma,\mathbf{u},\mathbf{v})=\mathbf{I}-\frac{1}{\sigma}\mathbf{uv}^{T} I can't find anywhere some theory about it. Can you give me some useful links? Thank you so much...

After suggestion to search for black holes at LHC one can ask how much black hole is similar to the elementary particle? Can we apply second quantization to the field of black holes? Can we talk, for instance, about cosmological black holes production in analogy with cosmological...

Homework Statement First of all, a bit about myself. I have just graduated from high school in Canada and now going to University for First-Year Engineering. I am having quite a bit of difficulty grasping even some of the so-called elementary concepts like basic quantum mechanics etc. Part of...

Homework Statement Show that any multiple of a row can be added to a row above it by row operations of other types. Homework Equations There are only 3 elementary row operations. i. Interchange two rows ii. Multiply a row by a constant iii. Add a multiple of a row to another row. The...

Homework Statement Obtain the pin-forces on the vertical bar BDE at the instant shown. Supply and document any additional information that my be necessary in order for this problem to have a tractable solution. (This is number 3 in the attached pdf file.) Homework Equations Newton's...

I was doing my differential equations homework. I had to solve y'' -4y = (e^(2x))/x. While doing this I ran into an integral\int\frac{e^{4x}}{4x}dx. I tried integrating my times but I couldn't; my guess is that this cannot be integrated in terms of elementary functions but I'm not sure. Is...

Im really good at number theory but how to show this statement has me stumped! "Show that among the positive integers greater than or equal to 8, between any two cubes there are at least 2 squares"

Can we see elementary particles using any device? I mean the way we can observe smallest of the viruses by a microscope and the farthest of the objects by a telescope?

I've seen this many times: someone will post a homework question asking them to prove something about an integral \int_a^b f(t) dt , where f is some arbitrary, continuous, integrable function. They will write in their proof, \int_a^b f(t) dt = F(b) - F(a) where they're assuming F is the...

I have a question regarding the attached file. How do you get those indicies when you multiply the kronecker deltas with A, B, and C? For instance, C - subscript m remains the same on the left side of the expression, but then becomes C subscript i on the right side. How does this logically...

Homework Statement Sorry for the double post, I couldn't re-edit the topic on my earlier post. The assignment is to represent the following matrix as a product of elementary matrices: 1 3 5 3 10 11 -2 -7 -7 I reduced this matrix down to the identity matrix I using elementary row operations...

Homework Statement Determine if the set of points (x,y) on y = |x-2| + 3 - x are bounded/unbounded, closed/open, connected/disconnect and what it's boundary consist of. Homework Equations The Attempt at a Solution I know that the set is closed, and then by definition of a closed set...

Introduction to Analysis by Maxwell Rosenlicht https://www.amazon.com/gp/product/0486650383/?tag=pfamazon01-20 Elementary Real and Complex Analysis by Georgi Shilov https://www.amazon.com/dp/0486689220/?tag=pfamazon01-20 Introductory Real Analysis by Kolmogorov...

Recently I have begun thinking about the function x^x. I am well aware that there is no elementary function to define it's antiderivative, and intuitively it makes sense (I cannot think of an elementary function who's derivative is x^x). However, how would one go about proving this rigorously?