Axis Definition and 928 Threads

Hi all. i am integrating in MATLAB and plotting the results in a y-vertical and x-horizontal system. where x and y symbolize j and i of a table. I have to re-label the y-axis, so instead of a 0 to 100, it should be 100-0. Is it possible to do that or does anyone have any idea or has any...

Hello :) Does an artificial satellite rotate in its own axis? tia

I want to figure out the 'a' of an ellipse (i.e. (major axis)/2) by knowledge of it's circumference and length of minor axis. Using my little knowledge which I gained from reading (roughly) the ellipse article of wikipedia; I realized that I need to use that notorious and approximate...

Hi, I'm doing a project in medicine, I've used MATLAB to create 3d graphs using a vector with 5 fixed values as X, a vector with 7 fixed values as Y. As Z I have 5*7 measured values. I need to interpolate my graph to "smoothen" the lines in the graph, but I am totaly lost, I have no idea how...

Can anyone suggest how to calculate the semi major axis of a body in an elliptical orbit when all I've got is x,y,z,vx,vy and vz? I'm guessing I need to calculate the eccentricity too. I really suck at conversions like this. :(

So I'm in the middle of a calculus 3 course, and one thing I've been lightly chewing on is how to change the direction of evaluation of a double/triple integral when the bounds are complicated enough that they can't be drawn easily on a graph. Would you have to use the optimization in several...

Homework Statement Consider a planet with uniform mass density p. If the planet rotates too fast, it will fly apart. Show that the minimum period of rotation is given by T^2 = 3(pie)/Gp Homework Equations F = ma = Gm1m2/R^2 (Equation 1) a = v^2/R (Equation 2) v= 2(pie)R/T...

Why are Horizontal Axis Wind Turbines used more often than vertical axis when it looks like a vertical axis has more of an advantage? Please can you explain it simply?

Homework Statement A wheel spins at 45rpm with its spin axis vertical. After spinning 15 sec, it is spinning at 60rpm with its axis horizontal. Find its average angular acceleration and the angle the avg acceleration vector makes with the horizontal.Homework Equations Sorry, I can't really do...

What is the instantaneous axis of rotation? Can you give some examples and a few situations in helping me understand this better. I can across this term while doing a problem in my physics textbook and I did not understand what it meant.

Homework Statement I must calculate the magnetic field for any point P on an axis passing through the middle of a square wire loop (whose radius is a and current is I). The situation is such that the square wire is on a plane that is perpendicular to the axis in which I must calculate the...

Homework Statement A rod is placed between two smooth perpendicular walls such that each end of the rod touches a wall. The rod is released with the bottom end making an angle @ with the horizontal (ground). Using the concept of instantaneous axis of rotation find the following: (a) The...

1. Thehttp://nft01.nuk.edu.tw/lib/exam/97/master/97ap-master.pdf" statement, all variables and given/known data A solid, uniform disk of mass M and radius R is oscillating about an axis through P. The axis is perpendicular to the plane of the disk. Suppose the friction at P can be ignored. The...

Greetings everyone, been having some problems with this question, A uniform circular disk has radius 36 cm and mass 350 g and its center is at the origin. Then a circular hole of radius 7.2 cm is cut out of it. The center of the hole is a distance 10.8 cm from the center of the disk. Find the...

Homework Statement Prove parallel axis theorem (Steiner's theorem). Homework Equations I_{parallel axis} = I_{cm} + Mr^2 The Attempt at a Solution I know Wolfram's site which seems to use http://scienceworld.wolfram.com/physics/ParallelAxisTheorem.html" I am not sure whether the hint of...

Homework Statement given z =y3 revolved around the y-axis what is the equation of the surface and then graph. Homework Equations The Attempt at a Solution I have no idea how to approach this, i tried searching around the net but nothing came out. pls help.

Homework Statement I'm having issues with this section in calc. I'm not at all sure what I'm doing! Here is the problem I'm having trouble with: Directions: Find the volume of the solids. Problem: The base of the solid is the disk X^2 + Y^2 <= 1. The cross-sections by planes...

Unfortunately my geometry is a little rusty: if I have an area A(x,y), and rotate it around axis z (yielding a symmetrical, circular body), what is the algorithm to calculate volume? Or am I remembering incorrectly, and the algorithms were for very specific shapes? E.g. a circular cylinder...

Homework Statement Compute the semimajor axes "a" of Halley's Comet. Given: orbital eccentricity e = 0.9673 period P =76 days (2.39674E9 seconds) Gravitational Constant G = 6.67428E-11 solar mass M = 1.9891E30 Kg. Also used in equations are: L = angular momentum of center of mass...

Two point-charges of +8 nC and -17 nC lie on the x-axis at points x = 0 and x = +10 m, respectively. Find the electric field on the axis at point x = +5.0 m. Assume vacuum. Answer in N/C. E= k0(q./r^2) Ok, this should be pretty simple, but for some reason it's not. First, I converted the...

Homework Statement How does the slope and y-intercept change if you reverse the x and y-axis of a linear graph. Will the graph still be linear? The original y=mx+b format followed the physics equation: V^2 = 2a(d) + Vi^2 Therefore, when y was "V^2" while x was "d", the y-intercept was Vi^2...

I've looked for this subject but perhaps I'm asking the question the wrong way. Please advise. Is there an extension of magnetic field (flux) beyond the beam axis of a laser? In other words, can one detect (or has anypone attempted to detect) the magnetic field around the a light beam in a...

Does it correspond with the centroid of the transformed section? For example, if a wood beam had a steel plate fixed along the bottom, would the neutral axis be lower than that of a pure wood beam of similar cross section? Any links showing example probs would be nice too. Sorry that this is...

Dear all, i met a problem that i couldn't get the on axis field of a finite solenoid that integrating from a thin shell solenoid equation. The thin shell equation link: http://www.netdenizen.com/emagnet/solenoids/thinsolenoid.htm And the on axis finite solenoid equation link...

Hello, I have a question regarding fft's. My experience with working with Fourier transforms is pretty much limited to transforming contrived functions pen and paper style. But now I need something and I think the fft is the appropriate tool, but I'm having a hard time understanding some...

Hi, this is my first post here, so please forgive any errors in my post. :) I'm recently thinking about switching from my major of computer science to physics, and have been brushing up on the first few semesters of physics I had taken a few years ago. I'm currently in the section on...

y=1/x, y=0, x=1,x=1, rotate around y axis; curious how to set this up using washers

Please explain what an "axis of inertia" or "principle axis of inertia" is! I have confronted these terms in a paper about molecular quantum mechanics, and they are completely unfamiliar to me. Can someone help?

Hi, I've been doing rotational mechanics at school and at the end of the chapter,the parallel and perpendicular axis theorems appear to have sprung out of nowhere! The proofs are given in the book but somehow, they don't make any sense. I can't understand their implications in the real...

Homework Statement A vector is given by R(vector) = 1.90 ihat + 1.30 jhat + 2.92 khat. Find the magnitude of the vector Find the angle between the vector and the x, y, and z axis Homework Equations I have read something about dot product but I am not sure if it applies here The Attempt...

Imagine we have a Equilateral triangle in the xy plane with one vertex at the origin. The triangle will be rotated about the z axis. The depth of the triangle, d, will be constant.B_r=B(r) From the picture I see that B_r=\frac{r}{h}B , V=\frac{B_rhd}{2}=\frac{Bdr}{2} First, I need to find...

i have two optical lens assemblies performing separate functions individually. Now I want to allign their optical axis .. how do i achieve the alignment? (actually i want to allign them back to back and ensure that their optical axes are concordant, if not overlaping ,then atleast parallel )

Calc. Angle between radius vector point and positive x axis? What does that mean? Homework Statement The cartesian coordinates of a point in the xy plane are x = −8.96 m, y = −1.75 m. Calculate the angle  between the radius- vector of the point and the positive x axis (measured...

The question that really troubles me is how fast the Earth spins around its axis? I was wondering that if the Earth spins really fast then why are the days slow.

Homework Statement Two particles, each with mass m = 0.85 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 5.6 cm and mass M = 1.2 kg. The combination rotates around the rotation axis with angular speed w = 0.30 rad/s. Measured about O, what...

Default semimajor axis of binary system help hi, I'm not sure if I am posting in the right place but I could really do with some help figuring out the semi major axis of a binary star system. I have been give the mean distance of each star from the center of mass (star A = 3.96 AU star B =...

Homework Statement While the bridge is closing with a constant rotation of .5 rad/s, a man runs along the roadway such that when d=10ft, he is running outward from the center at 5 ft/s with an acceleration of 2 ft/s^2, both measured relative to the roadway. Determine his velocity and...

if i have a case of a number of forces all working in 3d space, for example the following diagram of 2 tension forces http://picasaweb.google.com/devanlevin/DropBox?authkey=Gv1sRgCL_4l4PpvP_YsQE&pli=1&gsessionid=oBksCECRwcHSRoX-oRPaRA#5329455433140212770 and i am asked to find the total...

given the following system: 2 cords are attached to point C, http://picasaweb.google.com/devanlevin/DropBox?authkey=Gv1sRgCL_4l4PpvP_YsQE&pli=1&gsessionid=oBksCECRwcHSRoX-oRPaRA#5329455433140212770 and knowing that |TCB|=380N |TCA|=450N find: 1) the moment relative to x,y,z 2) the...

Homework Statement Using Matlab, I need to record vowels (a, e, o, i, etc) of my voice and apply a digital Fourier transform (DFT) to the recorded sound signal. The resulting signal should be a periodic train of 'spikes', with modulated amplitude. The modulation of the amplitude is what forms...

Hello physicists I have a circular body goes around its axis very fast. I am seaching for answer for these questions 1- How can I calculate its momentum or the energy that it has? 2- What is the forces that limit its motion? please I need your help thanks a lot

when i saw how to get the electic potential of a charged disk at a point on its axis i found that the E.P on center of the disk =0 as the integration of the eq: dv = 2k(q/a^2)((r^2)+(x^2))^(.5)dr...(a) is the radius of the disk , (r) is the radius of the element and (x) is the distance...

A small boat hangs from two brackets, one of which is shown in the figure. It is known that the moment, on the z axis, the resulting force Ra applied in the point A of support must not exceed the value of 217 N.m, in value absolute. Determine the more value possible the traction force in cable...

Homework Statement Find the potential at off-axis points due to a thin circular ring of radius a and mass M. Let R be the distance from the center of the ring to the field point and \theta be the angle between the line connection the center of the ring with the field point and the axis of...

Moment of inertia of a rod: axis not through the centre!? Homework Statement A meter stick of mass 0.44 kg rotates, in the horizontal plane, about a vertical axis passing through the 30 cm mark. What is the moment of inertia of the stick? (Treat it as a long uniform rod) Homework Equations...

Homework Statement A tightly wound solenoid of length L and radius a that has n turns of wire per unit length carries a current I. Calculate the the magnitude of the magnetic field at a point P on the axis of the solenoid, outside it and a distance y from one end, as shown in the figure...

Hey guys, A picture of the question is attached, I am not seeking answers just an explanation of some theory. Now I understand that point A will be under compression due to the weight, tension due to the bending and shear due to torque produced by the wind point b will be under compression...

Homework Statement The asteroid Pasachoff orbits the Sun with a period of 1417 days. What is the semimajor axis of its orbit? Determine from Kepler's third law, using Earth's orbital radius and period, respectively, as your units of distance and time. ans : _______ km Homework...

Homework Statement The electric potential at points in an xy plane is given by V = (2.7 V/m2)x2 -(4.4 V/m2)y2. What are (a) the magnitude of the electric field at the point (3.4 m, 1.6 m) and (b) the angle that the field there makes with the positive x direction.Homework Equations I have...

Very quick question: A uniform meter stick held by one end is swung in an arc and released when the person’s arm is horizontal, so that it moves initially away from the ground. About which point will it rotate as it flies before striking the ground? Is it the 50cm mark since once released...