Origin Definition and 651 Threads

hi I got an IGCSE exam in two days and can't find any info on position vectors could sum1 please help me out. And does a position vector have to do with the origin

Just a general question, what are your thoughts on "where" the universe came from, or what ever other way you want to phrase that? Personally, I haven't the foggiest notion. I don't believe in a personal god, but I think a creator is possible. And for those that say, where did the creator...

The position of a particle as a function of time is given by r = (6.50 ihat + 3.10 jhat)t^2 , where t is in seconds. What is the particle's distance from the origin at t_1 = 2.6 seconds? What is the particle's distance from the origin at t_2 = 6.2 seconds? What is the particle's speed at...

I guess most people know what it does but, AFAIK no one as yet knows the origin (other than the BB) of how gravity came to be or what it (is), why is the origin of gravity so elusive?

Homework Statement I need to get y = mx in polar form. I looked at it logically, and I figured I needed a function f(x) that will resolve 0 when x =/= 0, and will resolve 1 when x = 0. I thought for a while, and then realized that sine sort of does that, and just needs a tweak to do it exactly...

An electron has a negative charge and a proton has a positive charge, we say. Meaning that both are opposites of each other in terms of their charges. Consider a hypothetical situation in which there are only electrons having originally negative charge in a certain universal space and we are...

Could one say that the origin of life came about when a set of particles arranged in the right way were tipped into a sort of energy equilibrium that jiggled things back and forth, in obedience to physical laws (modern physical laws of course) And as this interaction of physical laws become...

Is Earth and the moon most likely the result of debris ejected from the supernova of an ancient star?

This sounds like a simple question to me, but the answer eludes. When you light a match, how are photons created? Or even any light source. I can't seem to wrap my brain around this one.

Let R be a convex region symmetrical about the origin with area greater than 4. Show that R must contain a lattice point different from the origin. This is the 2-D case of Minkowski's theorem, right ? How about the n-dimensional version ? The n-dimensional version is : Given a convex...

Homework Statement A particle is attracted toward the origin by a force proportional to the cube of it's distance from the origin. (...) What would be this Force equal to (in xy plane)? The Attempt at a Solution So distance is Sqrt[x^2+y^2]... and from here I don't know what to...

Hello, Can you please tell where radio waves originate from? Thanks, Glynis

Can someone please explain in details the origin of magnetic fields. I mean, how do electric fields produce magnetic fields and how do magnetic fields produce electric fields and all the other details.

Homework Statement A particle is moving along the curve y= 3 \sqrt(4 x + 4). As the particle passes through the point (3, 12), its x-coordinate increases at a rate of 2 units per second. Find the rate of change of the distance from the particle to the origin at this instant. Homework...

Origin of the term "sine" It is well-known that "sine" comes from the Latin word "sinus", meaning a "fold", or a pocket. However, its reference to the length of the half-chord on the unit circle remains still rather obscure. I recently came over an explanation that makes perfect sense...

How does logic arise and when/where did it first?

Viruses which cause hemmoragic fevers are usually passed on to humans through animals (eg: Lassa fever, Margburg virus, Ebola, etc). But from where to the animals get the virus from? Where do the viruses originate from? Is there always some animal carrying the virus in an inactive state?

I know that cotangent is thus named because its the compliment of tangent, but where did Secant get its name?

Just 147 years ago today (November 24), Darwin published On the Origin of Species by Means of Natural Selection.. Happy Anniversary! The online literature library has it available where we may peruse at our leisure.

Hi. This question is mostly done by a figure; we have a loaded truck of weight W being pulled by a truck with a force F. The CM point on the figure ndicates the location of the center of mass of the trailer and its load. Suppose the trailer accelerates forward (a>0) or backwards (a<0). What...

If I have one magnet sitting on a table and I take another magnet and bring close to the first one it will move towards the magnet! This is amazing to me. My question is why does one magnet make another move toward or away from it? what is the origin of magnetic force. I think it has...

I just heard about the reciprocity theorem in optics which states that for two currents 1 and 2 and their corresponding fields \int _V \vec{J_1} \cdot \vec{E_2} dV = \int _V \vec{J_2} \cdot \vec{E_1} dV which basically comes down to the fact that you can interchange the source and...

Heres how: Is it possible that a mechanism like this is also involved in the origin of life? When they say the bacteria are dead and then reassemble their DNA, isn't this a form of abiogenesis?

-Bearing in mind i ask this based on a theory of the big bang. Could all existent matter have been packed into a single atom of infinite energy levels, meaning as the universe 'expands' it is actually losing energy and will eventually be infinitly large and contain no energy?

A charge of 2.75 μC is held fixed at the origin. A second charge of 2.75 μC is released from rest at the position (1.15 m, 0.350 m). If the mass of the second charge is 1.50 g, and its speed when it moves infinitely far from the origin is 8.6838 m/s, at what distance from the origin does the...

I heard on the radio it is visiting day in the US, is this correct, and if so how did it originate ?

http://www.eurekalert.org/pub_releases/2006-05/biom-hac051106.php

"Three charges, +2.5 microC, -4.8microC, and -6.3microC, are located at (-0.20m, 0.15m), (0.50m, -0.35m), and (-0.42m, -0.32m) respectively. What is the electric field at the origin?" Using the coordinates, I found that r12 = 0.0625 m2, r22 = 0.3725m2, and r32 = 0.2788m2. I then plugged that...

The problem from Differential Geometry: Let \gamma : R -> R is smooth function and U = {(x,y,z) \in R^3 : x \ne 0} - open subset. Function f : U -> R is defined as f(x,y,z) = z - x\gamma(y/x) and this is smooth function. Proof that for surfaceS = f^{-1}(0) all tangent planes passing...

the big bang suggests that there was a huge energy density that exploded to create the universe my rather simple(and probably ignorant) questions are these... is the energies density consistent throughout? what would cause randomness following the explosion if it wasnt is it possible...

If we understand the possible origin of life very well, we could model it on a supercomputer using known physical laws. Physical laws can be used to trace a pathway forwards and backwards in time as astronomers do when predicting the motions of the planets, or tracing back previous postions...

Does quantum measurement uncertainty result from observer, object or both?

Hello, I'm wondering why do we have colors? If protons and neutrons are build upon the same particles shouldn't we have one single color? Else, if you put something transparent of for example red color under the beam of light, light will become of the color of the thing you put under, why is...

Lately the number of scientists against the big bang theory is increasing for lots of reasons espacially the growing number of hypothetical entities like dark matter, dark energy and inflation which scientists were not able to observe but only to predict by the analysis of backround...

Hi, I have recently been thinking about the fundamental meaning of the term probability, so I decide to discuss the topic with my tutor. He told me that the true definition of the probability of x occurring, P(x), is: P(x) = Lim(Relative frequency of x in experiments) as n tends to...

can some 1 help me with it pleasezz

So, I'm a teenager, and have always been interested in precisely how life began on earth. Is there any widely accepted and thuroughly proven theory about how you got from inorganic molecules, or even organic molecules, to the first cell? All I've ever gotten as a respons was pretty much this...

Could entanglement arise from the continuity of the initial universal singularity?

Last night I was watching a show on the science channel about astronomy. The show was very interesting but it was after my bed time and I fell asleep when they were talking about the mysterious origin of gamma ray burst. Last I remember they were talking about the burst coming from the early far...

The origin of "m"? Why is it that linear functions are often expressed in terms of f(x)="m"x+b? I mean, when dealing with all the other polynomials, we follow the typical f(x) = ax^n + bx^(n-1) + cx^(n-2)... so where did "m" come from? Why don't all textbooks just express it as f(x) = ax+b?

How can I find average distance from the origin point x=y=0 to the points of the curve using curve integral. Curve given by x=cos(2t), y=3sin(2t), t at [0,pi] I looked in books I have but there is no info on this.

I've been dealing with the 4-momentum for too many years without knowing its origin. I'm seeking the physics literature reference to the actual article/text which this item first appeared in relativity. This I hope will give me the person's name, the year and the motivation and actual historical...

A point charge q1 -4 nC is at the point x = 0.600 m, y = 0.800 m, and a second point charge q2 +6 nC is at the point x = 0.600 m, y = 0. I need to calculate the magnitude of the net electric field at the origin due to these two point charges. |...

The question is: - Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upwards along the y-axis at 2.0 m/s, and ball B is moving to the right along the x-axis with speed 3.7m/s. After the collision, assume elastic, ball B is...

I ask for a brief answer; can you build a building without ground floor? you cannot. how can you build a theory without explaining the origin of first living organism? Give me a logical answer

"Find the rate of chage of the distance between the origin and the moving point on the graph of y=x^2+1 if dx/dt=2 centimeters per second."...im sure it is a simple problem...any help?

I heel help with my math, so if you could do the work for me, no just kidding! But seriously, I need help. Find the slope of the line that passes through eash pair of points. Then determine whether the line rises to the right, falls to the right, is horizontal, or is vertical. 18. (6,1)...

Roh-Suan Tung used to be at University of Chicago, and at Uni Lancaster in the UK and at Taiwan Central University. Now he is at University of Shanghai. He has co-authored with Ted Jacobson. Eventually Loop Quantum Gravity could get securely established in Chinese People's Republic. It...

Can someone help with this? I want to say the answer is zero but I don't know how to explain it. Calculate the electric field at the origin due to the following distribution of charges: +q at (x,y)=(a,a), +q at (-a,a), -q at (-a,-a) and -q at (a,-a).

http://www.arxiv.org/abs/astro-ph/0508624 This paper offers a fairly natural explanation for the universality of dark matter halo profiles. In this model the mass accretion history has two distict phases, first a fast phase dominated by frequent mergers of smaller condensations of CDM...