Origin Definition and 651 Threads

Problem: Charges are located in a gridline figure. The figure has these points: (-0.2m,0.3m) -2 microC, (-0.2m, 0m) +2 microC, (-0.2m,-0.3m) -2 microC, (0.2m,0.3m) +2 microC, (0.2m,0) +2 microC, and (0.2m, -0.3m) +2 microC. a) Calculate x and y components of the electric field at the origin...

Homework Statement A charge of 4.0 microcoulombs is positioned at the origin, and a charge of -5.6 microcoulombs is positioned 32.7 centimeters to its right. The charges are not free to move; they are fixed in place. Where on the x-axis must a third charge of arbitrary sign be placed in...

Homework Statement A particle leaves the origin with initial velocity v0 = 11i+ 14 j m/s. It undergoes a constant acceleration given by a = –1.2 i + 0.26 j m/s2 (a) When [i.e., for t greater than zero] does the particle cross the y axis? t = s (b) What is its y coordinate at that...

Homework Statement A loudspeaker at the origin emits sound waves on a day when the speed of sound is 340 m/s. A crest of the wave simultaneously passes listeners at the coordinates (38,0) and (0,31). What are the lowest two possible frequencies of the sound? Honestly, I am most...

I'm curious as to the origin of the "1/2" in some of the basic equations in physics. For example, d=1/2at^{2}. If d=vt, and v=at, then d=at^{2}, yet in reality we need the "1/2". Why?

Homework Statement Find the points on the surface: z²-xy=1 nearest to the origin Homework Equations grad(f)= lambda grad(g) (?) f(x,y,z)=z²-xy (?) g=(0,0,0) (?) The Attempt at a Solution grad(f)=(-y, -x, 2z)= lambda (0,0,0) = (0,0,0) -y=0 => y=0 -x=0 => x=0 2z=0 => z=0 But...

I feel really dumb for this, but I keep getting strange answers so I may be forgetting something. Homework Statement Find the magnetic flux through a circle in the xz plane of radius "a" due to a wire. . The center of the circle is (b,0,0).Homework Equations Well I found the magnetic field to...

Can anyoune tell me how you flip a column in origin so you are reading it from bottom to top? I don't mind if it means making a new column. Or if this isn't possible then is it possible to do a differential when taking the bottom values first?? If that makes any sense Thanks

Homework Statement The electrostatic field of a point charge q is E=\frac{q}{4 \pi \epsilon r^3} r. Calculate the divergence of E. What happens at the origin? Homework Equations The Attempt at a Solution Well the solution is: \nabla.E= \partialEx/\partialx +...

http://www.youtube.com/watch?v=oM0oBuhTLRI[/youtube] http://www.youtube.com/watch?v=oM0oBuhTLRI" As some of you may be aware, the 150th anniversary of Charles Darwin’s Origin of Species is later this month, the 24th to be precise. In one week from today, a special abridged edition of the book...

how sad, this guy is an idiot http://www.huffingtonpost.com/2009/09/22/kirk-camerons-origin-of-s_n_294349.html?meh"

This is a random question and I'm not scientifically oriented (which is obviously why I'm posting here). If the origin of 'fossil' fuels as we know them came from the leftovers of biological species, why is 'fossil' fuel not called 'tree' fuel? Sure it sounds stupid, but there have been...

Hi guys, I'm not sure if this topic fits here, but can anyone tell me about the origin of planets? Like how is our planet formed?

Homework Statement Hello all. The question asked here is to find the point on the surface: z2 - xy = 1 that is closest to the origin. The Attempt at a Solution I only have experience in doing this with 2 variables. I begin by trying to find "d", I get that d = sqrt[...] but I have three...

Homework Statement An object is at the origin. They're four perpendicular forces acting upon it. In the negative x axis, 18 N. positive x axis, 10 N. negative y axis, 8 N. and positive y-axis 15 N. calculate the resultant force. What angle is it at? Homework Equations F=Ma? The...

Apart from evolution and intelligent design what other serious origin theories are there?

In the theory of superconductivity BCS theory is given eigen - problem -\frac{\hbar^2}{2m}(\Delta_{\vec{r}_1}+\Delta_{\vec{r}_2})\psi(\vec{r}_1-\vec{r}_1)=(E+2\frac{\hbar^2k^2_F}{2m})\psi(\vec{r}_1-\vec{r}_1) Why E+2\frac{\hbar^2k^2_F}{2m}? Maybe because is Fermi sphere is centered in...

The parabola y = x2 is rotated anti-clockwise about the origin through the angle 30o. What is the new equation of the new curve (relative to the standard basis)?

Homework Statement If given a velocity vs. time graph where max. constant velocity is 2m/s for 2s and the object turns around at 4s with max negative constant velocity is -2m/s for 2s. How do i find the greatest distance from the origin? Homework Equations d= vi+vf/2 *t d=vit +...

A hypothetical and "impossible" solution to the origin of the Universe. To fully understand the principles by which light operates we have to know that if you look far enough away you can see the universe when it was much younger than it is now due to the amount of time it takes light to reach...

Homework Statement Why does the lift curve, Coefficient of lift plotted against angle of attack, go through the origin of the graph for some airfoils but not for other airfoils Homework Equations The Attempt at a Solution

Hello, I wonder if there is a common origin to the 'virial theorem' by Clausius and the 'virial expansion' or equation of state used to express the compressibility of a gas. I am just wondering about this because the two concepts do not seem to have a common mathematical origin (that I can...

Homework Statement Two sinusoidal waves in a string are defined by the functions y1 " (2.00 cm) sin(20.0x # 32.0t) and y2 " (2.00 cm) sin(25.0x # 40.0t) where y1, y2, and x are in centimeters and t is in seconds. (a) What is the phase difference between these two waves at the point x " 5.00 cm...

Let's say I have two coordinate system in first-rank tensor form: x^{\mu}=\left[\begin{matrix} x \\ y \\ z \end{matrix}\right] and x^{\mu^\prime}=\left[\begin{matrix} x^\prime \\ y^\prime \\ z^\prime \end{matrix}\right] and I want to translate the origin of x^{\mu^\prime} from the origin to...

Why is the divergence operation called the 'divergence?' What is the significance of this operation on a vector-valued function? And what about "the curl?" The curl seems self-explanatory (at least it does in electrodynamics), but I need someone to expound on 'the curl' as well.

How often do you return AND CROSS the origin in a random walk? Is there a probability distribution for how many times can you expect a change in the lead of a coin tossing contest between two players (heads Vs. tails)? Which is the most likely # of changes in the lead?

I use c to program. Usually, I write the data to files and plot them with other software like IDL or origin. but I really tired of it, since i need open a file thousands times while debug. Is there any better method to plot the data. which methods do you use?

We're told in school that the only way to catch an STD is to have intimate relations with someone who's already infected. If that really is the case, then how can these diseases have started in the first place? There must, logically, be some other way of contracting them.

Homework Statement A sphere with radius 65 cm has its center at the origin. Equal charges of 4 μC are placed at 60◦ intervals along the equator of the sphere. What is the electric potential at the origin? Homework Equations V=KQ/R The Attempt at a Solution I just plug the...

Homework Statement Show that the distance D from the origin of any point (x , y , z) lying on the plane x + y + z= 1 satisfies D^2 + x^2 + y^2 +(x + y -1)^2 . By considering partial derivatives, find the point that is closest to the origin. Prove that this distance is genuinely minimal...

stupid question from a high school kid. How do you algebraically rotate (not flip) a function about the origin for any given angle? and what is the notation for it?

Homework Statement Three charges, +2.5\muC, -4.8\muC & -6.3\muC 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? q1 = +2.5\muC q2 = -4.8\muC q3 = -6.3\muC Homework Equations a^{}2 + b^{}2 = c^{}2 v_{}x = magnitude...

Just want to make sure my concepts about this fictitious force is correct... " Assuming Joe is spinning around on a stationary point, while holding a string tightened onto stone. Therefore, he is providing a centripetal force to the stone through the string, so that it rotates around him...

If there's a point charge at the origin, I want to find two closed surfaces such that the flux through one of them is zero while the other is not. I know this may seem trivial but I just want to make sure I understand the question. My answer would be that to get a zero flux, the closed...

Homework Statement Determine the Angular Momentum of each particle about the origin Point A Located @ (-8,12), 6kg,4m/s, headed 60degrees below the horizon to the right Point B (2,1.5),4kg, 6m/s, headed 30 degrees above the horizon to the right Point C (6,-2), 2kg, 2.6m/s, headed...

Question is in the title. Seems a lot of people throw that statement around as if its obvious, but it isn't obvious to me. I can kind of see how it might be true. If you take a group element, differentiate it wrt the group parameters to pull down the generators, and then evaluate this...

A +12 nC charge is located at the origin. What are the electric fields at the positions (x,y) = (5.0 cm, 0 cm), (-5.0 cm, 5.0 cm), (-5.0 cm, -5.0 cm)? Write each electric field vector in component form. I got the answer for the first one, but I can't figure out how to get the answers for the...

-Big bangs origin relative to the Earth's location- i'm trying to comprehend this from the Earth's point of view. -If we have readings of an eliptical expansion (such as cobys imagery) how did we get that relative to the Earth's regional area in the universe? are we near said origin...

Hi, Anyone have a literature that describe this equation: http://i588.photobucket.com/albums/ss326/ricky_fusion/P_3.jpg I need to know how where is it coming from.. Thanks a lot by your helpfull.

why? the same goes for kinetic

Homework Statement find the point closest to the origin on the curve of intersection of the plane 2y+4z=5 and the cone z^2=4x^2+4y^2 Homework Equations The Attempt at a Solution see 40 attachement. I found the used f(x,y,z)=x^2+y^2+z^2 and found its gradient. found ggrad and...

Hi i m new here. i 'll get straight to the point. we know that a thermodynamic system always tend to proceed to a higher entropy level then how did 'living organisms' that are highly organized and thus have low entropy emerge from a chaotic system that has very high entropy (here the...

Homework Statement Show that the origin (0,0) is a critical point. Write the linear differential equation in operator format and solve. Homework Equations x'' + 10x' + 25x = 0 The Attempt at a Solution I am not sure how to show that the origin is a critical point (without using...

http://news.yahoo.com/s/pew/63rejectdarwinstheoryofevolution;_ylt=An8rzCf84KVpYf08mAMFUO8DW7oF After all of these years ... Perhaps what we are witnessing is the exhibition of " an evolutionary trait " deemed as common sense. Really - why do some scientist believe that there is an...

Hello, could someone please explain to me why the equation y=mx+b uses 'm' for slope and 'b' for y-intercept? This has always bothered me for some reason.

Hi I have a problem. I want to prove a necessary condition in a theorem. I know that a smooth transformation is diffeomorphism around the origin. Can I show that its jacobian is nonsingular at the origin?

There is currently a number of proposals for the evolution or origin of the Moon. It has an unusually high inclination to the Earth's equatorial plane and a low inclination to the ecliptic, which has prompted varied speculation. (See Wikipedia Moon). I was particularly interested in the...

The title of this thread is taken from the 1952 paper by Professor D.W.Sciama. Having just spent the lunch-hour reading it, I have a question. (I accept that I should go and do some more reading to find the answer myself, but life is short and my desire to know is strong.) To what degree of...

[Please move this question to appropriate form, if it does not fit here] Many of my theist friends ask me, "if science tells you matter can neither be created or destroyed, how did the universe originate from nothing". I'm unable to answer them clearly . Can someone explain this in currently...

How do I find the electric field at a point p distance x away from the origin? I guess the y component cancels. I should use the equation E = kq/r2 and add the electric field made by the 3 charges as vectors, but how do I do that? My attempt: r = x/√(x2 + a2) cosθ = x/r Ex =...