Origin Definition and 651 Threads

Starting out at zero on a number line and moving in succession one unit right or left at random, what is the probability that you will eventually return to zero?

Can BH be formed during star formation process? For instance, giant gas cloud or several collided clouds. In this case, can BH be created right after BB? Thank you.

Omega Centauri is suspected of being centred on a black hole and of perhaps being the remnant of a small galaxy rather than just a globular cluster. Could someone tell me, in either case, what the the accepted view is of how the black hole got there? Was it created as the star cluster formed...

Hi, I am just curious as to whether the "multiverse" predicted by M-theory (and other similar theories) is theorized to have an origin. Or is it envisaged as some sort of infinite membrane on which our universe and others like it are created but itself having no origin, cause or point of...

Homework Statement find the points on the curve 9x^2 + 4xy +6y^2=11 that are farthest away from the origin Homework Equations The Attempt at a Solution

Now I know light motion is consistence from any frame of reference and can’t accelerate since it is mass less and lacks momentum. So the speed of light is always c. What about the point where light started? So does that imply that the speed of light was c at the point it was starting? That means...

Origin of the term "seperable" I was just curious as to why out of all properties of metric spaces (ie compactness, closure, etc), i don't know how the term seperable makes sense intuitively... is there an origin to this term? Just curious. cheers

I work in computer graphics so I use and am familiar with the fresnel equations governing reflections from conductors and dielectrics. My question is about the origin of these effects. As I understand it, the fresnel equations describe the 'average' result of myriad individual photon-material...

will the graph of the solution to the differential equation dy/dx=1+y^4 pass through origin? My solution graph is not passing through origin. If it should pass, then how?

Hey, quick question. Is there any way that we can sort of "explain" Newton's Third Law as a corollary of Newton's 2nd (consv. of momentum)? I mean, if object A is interacting with object B, and initially the total momentum is p_A + p_B, then change in p_A = -change in p_B for momentum to be...

r^2 = x^2 + y^2 + z^2 I would like to know what would be the equations be for: A sphere of radius = r in Rectangular Coordinates fx(x,y,x)*x +fy(x,y,x)*y + fz(x,y,x)*z fx(x,y,x)=? fy(x,y,x)=? fz(x,y,x)=? A sphere of radius = r in Rectangular Coordinates with spherical members...

I am using Excel and plotting a line of best fit for Resistance vs. Bandwidth. I used the LINEST function to get my values, and it shows that it would cross the y-intercept at around 288 Hz. I am just wondering why when using resistance vs bandwidth it would never cross at the origin. That is...

can an educated person give me an explanation on how the first cell came to be? I mean how simple can a cell really be? and I thought of something, once a cell assembles why does it need DNA, as long as the current enzymes are not destroyed it does not need blueprints on how to create them again...

I'm trying to do a simple electric field due to point charges problem, but I'm stuck on a very simple detail. There are a number of point charges on an xy plane, and one of the point charges is at the cooridinate (1,-2). I need to figure out which angle a line drawn from this point to the...

1. Is it true that time was created in the big bang? In that case; what was it created from? 2. Is it possible that the universe is infinite in space, matter/energy or time? 3. Will the universe continue to expand forever? 4. If time was created in the BB, does it need to have a cause? I've...

Homework Statement A continuous line of charge lies along the x axis, extending from x=+xo to positive infinity. The line carries charge with a uniform linear charge density lambda. What are the magnitude and direction of the electric field at the origin? Homework Equations E =...

Hey, this seems easy, but I'm not sure. Does the displacement depend on the choice of the origin for the coordinate system?

I have read that we may someday be able to initiate the creation of a universe in the laboratory. From a layperson point of view, can someone enlighten me. Is this really possible? If it ever happens then the link between the newly created universe and ours would be very brief so would we...

Homework Statement A particle leaves the origin with an initial velocity v = 3.92i , in m/s. It experiences a constant acceleration a = -1.00i -0.80j , in m/s2. What is the velocity of the particle when it reaches its maximum x coordinate? i-component of velocity? j-component of the...

i have no idea how to solve these 2 questions.. please direct me to the right way. 1. Find the vector from the origin to the center of mass of a thin triangular plate (uniform density) whose vertices are A(7, 7, 2), B(7, 4, 6), and C(4, 10, 1). 2. Find the area of the parallelogram determined...

Homework Statement You want to create an electric field = < 0, 5e4,0 > N/C at location < 0, 0, 0>. Where would you place a proton to produce this field at the origin? Homework Equations \vec E = q\hat{r} / 4\pi\varepsilon r^2 The Attempt at a Solution I'm not sure how to treat...

(If you don't feel like reading all three paragraphs just skip to the sentence written in bold.) So I am autodidacting myself through the world of (quantum) physics, just the concepts of course, no math and I finally got to a stage where I can use my present knowledge to (partially) deduce...

Can anyone explain to me the origin of the spatial metric for measuring distances in non-inertial frames? d\ell^2 = [(g_{0i}g_{0j})/g_{00} - g_{ij}]dx^i dx^j. I've heard it quoted but never seen it derived. I believe it works on the assumption that distance is half the proper time for...

Homework Statement A particle moves along the parabola y = 4x^{2} such that it's x coordinate increases at a steady rate of 5 units/minute. How fast is the particle's distance from the origin changing when it is at the point (1,4)? Homework Equations The Attempt at a Solution...

Homework Statement "What is the physical origin of gain in a BJT?" I can figure out gain using gain equations but am having a hard time describing the physical origin of gain in a BJT.. can anyone help?

I've heard that before cosmologists found that our universe' expansion was accelerating, they thought that there could be enough matter to cause expansion to stop and the universe would undergo the 'big crunch' which could result in another big bang. Once they theorized this they concluded that...

arXiv:0808.1081 (cross-list from physics.pop-ph) [ps, pdf, other] Title: The kinematic origin of the cosmological redshift Authors: Emory F. Bunn, David W. Hogg Comments: 14 pages. Submitted to Am. J. Phys Subjects: Popular Physics (physics.pop-ph); Astrophysics (astro-ph); General...

I was having a discussion about the cause/s of conservation of momentum with a friend and was given a very unsatisfactory explanation (something to do with space being homogenous). Is it an irreducable physical law like the conservation of energy, or is there a good (intuitive) physical...

I've just been watching the animated film Astérix et les Vikings. Apparently the inhabitants of Astérix's Gaulish village like to fight each other using fish as weapons! I'd post a screenshot if it weren't for our rule about copyrighted content.

Homework Statement A line of charge with a uniform density of 35.0 nC/m lies along the line y = -12.6 cm, between the points with coordinates x = 0 and x = 44.2 cm. Calculate the electric field it creates at the origin. Find the x- and y-components of the field. Homework Equations I...

Theory of Pluto's Disruption of Orbit Several hundred millennia ago, Pluto was originally a miniscule satellite (about 75%-65% of it's current mass) of larger Neptune when a comet (being 6/8 of the mass of pre-collision Pluto) struck Pluto with as much force to push Pluto out of orbit around...

I'm doing some research on the history of particle physics from 1947-1964, and have been completely unable to find an answer to this question -- does anyone know when and by whom terms such as baryon number and hypercharge were introduced? A related question...Several of my sources cite a...

I've been watching documentaries and programs related to the Universe and its origins. That made me curious and I began reading/researching more about this topic. All sources do a good job of explaining everything back to the point of origin. However, there's something that no one seems to be...

hello, I am curious about born repulsion of atoms, ie short range repulsion energy term proportional to 1/r^n. I find this in many solid state type books and they all call it the born repulsion and give no hints to its derivation or where it comes from. In _Atomic Physics_ 6th ed. by Max...

Homework Statement The value of the Electric field at a distance of 82.8 m from a point charge is 75.3 N/C. Its direction is radially in toward the charge. The Coulomb constant is 8.98755 E9. Find the magnitude and sign of the point charge at the origin. Answer in units C. Homework...

Hello, given (x^2)/(a^2) + (y^2)/(b^2) = 1. and using polar coordinates x=rcos(phi) , y=rsin(phi), equating gives r^2 = 1/[(cos^2(phi)/a^2) + (sin^2(phi)/b^2)]. or if we leave b in the nominator : r= b/[(sin^2(phi)+(b^2/a^2)cos^2(phi)]^1/2. -could someone give a hint as to how the...

Determine whether the graph of the relation is symmetric with respect to the y axis, x axis, or the origin. y=(x-3)^{3} I don't know how to produce a visual of the graph with this post but it is a graph of y=x^{3} moved 3 units to the right along the x axis. Visual examination of the graph...

[SOLVED] Electrodynamics problem: charge origin? When you have an insulating region within a conductor and an electric field is applied such that a current flows, this current will be made to move around the insulating region. -I assume a charge distribution will arise on the surface of the...

[SOLVED] kittel page 166 Homework Statement In Figure 3 of Chapter 7 of Kittel's Solid-state physics book, it says that this is the key to understanding the origin of the energy gap. However I do not understand why. It seems like if you take the expectation value of either |\psi(-)|^2 or...

So if a black hole in summary is anybody massive enough to succumb to it's own gravity. And before the Big Bang all the Universe's matter was in one location. How was this not a black hole? Clearly if you have all the mass of the Universe you kind of pass that threshold of "just enough matter."...

I have read there's a lot of water in comets, and comets are abundant in the universe. H2 is also abundant, but oxygen? That means oxygen is also abundant in the universe? Why not sulfur or any other elements? Can anyone explain this to me?

[SOLVED] General equation for plane through the origin Homework Statement Show that for any funcions f(t), g(t), and h(t), the graph of r(t) = [f(t)-g(t)]i + [g(t)-h(t)]j + [h(t)-f(t)]k lies on a plane passing through the origin. Homework Equations The Attempt at a Solution...

Hi, I have recently been reading that the currently favoured theory for the origin of the moon is that a Mars sized object smashed into an almost finished earth, ripped off large parts of proto-Earth's mantle and the result debris coallesced into the Earth and moon again. I know the...

Where did everything that went 'bang' come from ? It would seem to me that even potential must have a source of origin. Accepting that the Big Bang is true, where did it come from ? Where did all the potential of the unified field come from that went 'bang'? What caused all the 'matter' of the...

I need to draw a graph. According to the directions, I need to, "supress the origin of the abscissa so that the range of my X values covers the hozrizontal scale" I know the abscissa means the x-coordinate, but I don't know what the origin of the abscissa means and how I would "suppress it"...

On November 24 1859, Charles Darwin published his On the Origin of Species. This a day for celebration, because it is not only a science book, it was the beginning of a story about us! :biggrin: http://scienceblogs.com/corpuscallosum/images/Origin_of_Species_title_page.jpg At the time of...

Homework Statement At how many points on the curve 4x^{}5 - 3x^{}4 + 15x^{}2 + 6 will the line tangent to the curve pass through the origin? Homework Equations The Attempt at a Solution I have no idea of how to even approach this... Erm, I fiddled around with the point-slope formula...

The universe’s clock has neither a start nor finish, yet time is finite according to a New Zealand theorist. The theory, which tackles the age-old mystery of the origin of the universe, along with several other problems and paradoxes in cosmology, calls for a new take on our concept of time –...

Today I told my astronomy teacher I would like to write my 5 page paper, that is due Monday, on the origin of the solar system. I am in no way one of the best writers out there and have no clue on how I could write 5 pages about this. Hopefully someone here can give me some helpfull input...

Homework Statement x^2 - 2xy + 6y^2 = 10 Find the point on the ellipse closest to the origin (0,0).Homework Equations The Attempt at a Solution Absolutely no one in my class can solve this. We've been to the math lab and none of the helpers there know how to solve it. I think the only person...