Coordinate Definition and 868 Threads

The points Q moves such that the length of the tangent from Q to the circle x^2+y^2+4x+8y+9=0 is equal to the distance of Q from the origin ). Determine the locus of Q. I am basically clueless about this question...but I will try to provide as many work I have done on this question. I assume...

How can I identify the coordinate transformation that turns ds^2 = \left(1+\frac{\epsilon}{1+c^2t^2}\right)^2c^2dt^2 - \left(\frac{\epsilon}{1+x^2}\right)^2x^2 - \left(\frac{\epsilon}{1+y^2}\right)^2y^2 - \left(\frac{\epsilon}{1+z^2}\right)^2z^2 into the Minkowski metric ds^2 = c^2dt^2...

I am a little confused with this. I know what a dative bond is, but the problem is when it comes to complex ions I do not understand. ok now for example NH_3 + H^+ = NH_4^+ So in this the lone pair of NH3 will fill the s- subshell of H and make it stable, but say in Cu^2^+ when this attracts...

Homework Statement For a universe with k=0 and in which (a/a_0) = (t/t_0)^n where n<1, show that the coordinate distance of an object seen at redshift z is r=\frac{ct_0}{(1-n)a_0}[1-(1+z)^{1-1/n}].2. The attempt at a solution I have used r=f(r)=\int_{t}^{t_0}...

The points P(cp,c/p) and Q(cq,c/q) lie on the rectangular hyperbola xy=c^2. Show that the equation of the chord PQ is pqy+x=c(p=q), and deduce the equation of the tangent at the point P. I can do the proving. And I can find the tangent as well if the word "deduce" is not there. How can you...

Given a state |psi> and an operator A with (non-degenerate) eigenstates |a[SIZE="1"]i> corresponding to real eigenvalues a[SIZE="1"]i, express the wavefunction psi(x) corresponding to the state |psi> in terms of |psi> Now this was a question in last year's exam that my lecturer went through...

I know this might be a stupid question, but I wan't to know if any of you know of any sites that convert between RA and dec coordinates to altitude and azimuth coordinates. I mean I found this site: http://home.att.net/~srschmitt/script_celestial2horizon.html But unfortunately you can't...

Homework Statement Sketch the curves with the following equations: a) y=5x^(3/4) b) y=-2x^(-3/2) Homework Equations The general equation of curves (circles, parabola, ellipse, hyperbola) The Attempt at a Solution It seems to me that this question is not exactly a coordinate geometry...

Hi, I have a pretty in depth understanding of special relativity. Recently I have been searching for mathematical proof of the Lorenz transformation. I found some information about it, but to tell the truth I didn't understand much of it. Maybe one of you guys can shed some light on the proof...

coordinate help please :) Hi i just got my home work but don't know where to start. Any help on this just to get me started would be great:) I want to make sure I am doing it right Thank you Work out the coordinates where this line meets this plane. Line x = -4 t + 4, y = -4 t + 6...

I am trying to get from one 2D coordinate system to another 2D coordinate system. I found 2 corresponding points and each system. I did the following: [a1 a2 ] * [ x1,y1 ] = [u1,v1] [a3 a4] [ x2,y2] [u2,v2] or A*x = u if I use MATLAB to...

I know that some people worship Symon's Mechanics 3rd Ed., but I find this book incredibly confusing...especially chapter 7, dealing with rotating coordinate systems. I follow the math, and perhaps the logic, but I can't even find a way to start the homework problems. The guy doesn't give any...

Do coordinate covalent bonds have to involve the sharing of a PAIR of electrons or can it just be a single electron? Example: XeF4 Now, since Xe already has a full octet, it would seem correct that the F basically shares electrons to Xe without donating any as well. This would only be true...

I hae a kind of strange, vague question. We know that any vector in R^2 can be uniquely represented by unique cartesian coordinates (x, y). If we wish to be more rigorous in our definition of "coordinates" we consider them to be the coefficients of the linear combination of the standard basis...

A general orthogonal coordinate system (u,v,w) will have a line elemet of the form: ds^2 = f^2 du^2 + g^2dv^2 + h^2dw^2 I have done a lot of vector calculus, but for some reason I can't figure out what this means! What is a line element? I know about the differential length element and its...

I'm doing a series of questions right now that is basically dealing with the dot and cross products of the basis vectors for cartesian, cylindrical, and spherical coordinate systems. I am stuck on \hat R \cdot \hat r right now. I'll try to explain my work, and the problem I am running into...

Local coordinate system in GR observed. If one considers coordinate systems in General Relativity. I think, if I understand it well enough, that in GR space & time and or in space-time a coordinate system depends on locality, e.g. on an average distance between galaxies an the total amount...

I have a vector (<1, 0, 0>) that needs to be transformed from an initial 3d rectangular coordinate system M1 through M2 and M3 to a final 3d rectangular system M4. I'm currently doing this by applying sequential rotations omega, phi, and kappa about the x', y', and z' axes, respectively, for...

How can I graph single points on the graph in Mathematica? Or draw whole coordinate plane, with *boxes*, like this one: (and then plot) Can't find the informations in the tutorial I'm using presently, Thanks,

Hi. I have been reading the forums for quite sometime now, but this is the first time I decided to join in the fun. :biggrin: I am wondering why the tortoise coordinate is called tortoise coordinate (why not turtle or hippo... :-p) . I have tried searching for the answer online but couldn't find...

Hello guys, at the link http://mathworld.wolfram.com/Superellipse.html you can find the definition of superellipse. Now consider the particular super ellipse \frac{x^{2n}}{A^{2n}} +\frac{y^{2n}}{B^{2n}} = 1 In which A,B, are constant and n is a positive integer. What is the...

Hello, I have a "simple" problem for you guys. I am not expert in math and so try to be simple. I explain the problem by starting with one example. The polar coordinate system has the following main property: with two parameters, rho and theta, each point is described as the intersection of...

I am currently learning about coordinate geometry. But I need to brush it up a little also. I want to know geometry about the straight line. Can anyone give me a website for this. i searched in the google but can't get any results that I need. Thanks alot.

Hello, I was wondering how one would go about finding the coordinate transformation that diagonalizes: 2(x1)^2+2(x2)^2+(x3)^2+2(x1)(x3)+2(x2)(x3) Thanks a bunch.

What is the difference between a frame of refernce and a coordinate system. For example, I know that a rotating frame of reference is non-intertial, but is this also a non-intertial coordinate system? Thanks.

Not actually homework, but just a general query... I'm trying to write a program that will predict the trajectory of a moving point by analysing several positions through which the point has passed. Part of this involves finding the coordiantes of a point B, given the coordinates of another...

x^2 + 2x + 5 = 0.Find the root of this eqn.can use polar system. is the answer=(-1+2i) @ (-1-2i)?? pls help... thanx...

Pleas help me with this exercises(this is not a homework): Determine whether the points lie on a straight line. a) A(5,1,3), B(7,9,-1), C(1,-15,11) b) K(0,3,-4) L(1,2,-2), M(3,0,1) Should I draw the graph, then find the slopes? Or is there any other way to approach? Pleas help...

Is it correct to think about SR as different observers using different coordinate systems depending on their speeds? This would meen that their measurements would differ since space, time, mass,etc.. measurements depend on the system used. I find it very easy to understand SR when I think...

1) Rewrite the following expression in polar coordinates: (second derivative of z with respect to x) + (second derivative of z with respect to y) where x=rcos(theta) y = rsin(theta) i had first derivative of z with respect to x = (dz/dx)(dx/dr) + (dz/dx)(dx/d(theta)) same concept for...

Hi, I'm a first year university student and I don't understand vectors and the coordinate system. I tried reading the book, but it doesn't make sense to me like the magnitude of theta and sigma or the oval with the vertical line through it. If someone could help me with the concept of it and...

Hi. I am drawing a complete blank on this calc problem. Point a moves along the x-axis at the constant rate of 'a' ft/sec while point b moves along the y-axis at the constant rate of 'b' ft/sec. Find how fast the distance between them is changing when A is at the point (x,0)and B is at...

I have a question about the equation mechanics of cylindrical and spherical coordinate systems This is basically about the velocity and acceleration equations of both Let me just give an example from cylindrical \vec v = \dot r\hat e_r + r\dot\theta\hat e_\theta + \dot z\hat k and...

So often students question the validity of the twin paradox and how acceleration is involved in looking at round trip scenarios that I am asking why not just give them the tools to transform between the coordinates of an inertial frame and those of an accelerating frame. It is not hard to do and...

These problems are actually for my classical mechanics class, but they are linear-algebra based. I can construct a transformation matrix, but I have trouble visualizing the rotations, particularly in 3-space. So if someone could help me get a pictorial idea of what's actually happening, then...

i have been set the following question theta = 3r^2 find the magnitude of the acceleration when r=0.8 m dr/dt = 4ms^-1 d^2r/dt^2 = 12 ms^-2 my working followed the process of calculating angular velocity with these conditions and angular acceleration with these conditions then...

hi i want to know what is cordinate system and how to find angle b/w two connected lines

I have been thinking about this problem for awhile, but have no idea to even begin solving it. Was wondering if anyone has a clue to help me started? There's a point (x0,y0,z0) in 3D. There is a line on the X-Y plane. This line is say theta degrees (0 - 360) about the Y-axxis. If the point...

Say, i have a vector a, defined in a coordinate system, x-y-z and i rotate the axes by an angle theta around the z-axis, so i have my z-component invariant in this change of basis. Can someone show me why, a_x' = a_x cos\theta + a_y sin\theta and a_x' = -a_x sin\theta + a_y cos\theta...

Hi all (<--new user) I've spent the last 6 months trying to learn A-level mathematics in a vacuum after 9 years of letting my GCSE knowledge slide into oblivion, this is the first time however, I've hit a question for which how the book arrives at its answer is completely frying my brain. The...

I'm wondering if anyone here might have a solution to a problem I've having. This is a Quantum Mechanics problem I'm doing. I calculate a 4 by 4 complex Hermitian matrix (H = Hamiltonian) in a basis where it is not diagonal. I diagonalize it numerically (using eispack) and get eigenvalues...

Gents, Could you please help me: Speaking about General Coordinate Transformations, one speaks always generally. Are there any explicit expressions for General Coordinate Transformations? Like in SR speaking about Lorentz Transfrmations one recalls Lorentz Matrixes. Maybe I'm not quite...

To calculate the divergence of a vectorfield in cartesian coordinates, you can think of it as a dot product, and to calculate the curl, you can think of it as a cross product. But how can you calculate the div and curl when you have spherical or cylindrical coordinates, without explicitely...

Hi there, I've been struggling with this question for days :cry: :confused: , the first part where they call me to prove that equation, i could do it...the second one i don't know how to do...could anyone help me? how do i find the locus equation? its so confusing... ty in advance. If...

Hi. I’ve just started learning about tensors on my own and am still trying to understand coordinate transformations. If I begin with a vector whose Cartesian components are (x, y, z) and apply the tensor transformation to cylindrical polars, I end up with (r, 0, z) – is this right? I...

The question is in the attached picture. i can't seem to find a relevant formula and when i do i can't get a suitable answer, if some one can help, i'll highly appreciate it. Thanks in advance.

My professor said this problem is straightforward in spherical coordinates, \int_{|\vec{r_1}|\leq a } \int_{|\vec{r_2}|\leq a } \frac{1}{|\vec{r_1}-\vec{r_2}|} d^3 r_2d^3r_1 i set up the integral in spherical coordinate and found it really ugly...

Coordinate Geometry II HARD! 1a). TriangleABC has vertices A(4,6), B(-3,4) and C(-1,-3). Write down the three inequalities whose intersection is the interior of triangleABC. 1b). Prove that triangleABC is a right angled isosceles triangle. 2a). The lines L1 and L2 have the equations...

Problem : A baseball player releases a ball with v_0= 100 ft/sec at an angle of \theta= 30 degrees. Determine the radius of curvature of the trajectory (a) just after release and (b) at the apex. For each case compute the time rate of change of the speed. I really wasn't sure how to do the...

at (2,3,-4) express the unit vector z in spherical terms. express the unit vector r in rectangular terms. for the first part, would it just be (1,X,0) fi should be zero because that's the angle the line makes with the z axis, and since this is going to be parallel to the z-axis this...