Shape Definition and 613 Threads

Does a 60W Type A (general service) incandescent light bulb put out more light than a 60W Type B (candelabra torpedo) incandescent light bulb?

h have a T shaped object (2-d) for which i need to find the moment of enertia, i used a parallel axis theorem, then to check myself i found i site which had a direct equation for it http://www.efunda.com/designstandards/beams/SquareTbeam.cfm what i did b1=100mm h1=12mm b2=12mm h2=75mm...

Hi, everyone. Can someone help me to understand pulse? What is the meaning of temporal shape? is it means the intensity distribution of the pulse is following the shape? What is the relationship between temporal shape and spectral mode distribution? Is that the Fourier transform...

Homework Statement Clepsydra was a water clock used in old times in which water was allowed to espace through a small hole at the bottom. Find the shape of the clepsydra, if the water level is to fall at a constant rate. Homework Equations Torricelli Law The Attempt at a Solution...

http://www.examiner.com/x-5182-Dallas-Weather-Examiner~y2009m12d10-Solar-systems-greatest-mystery-at-Saturns-north-pole If anyone here knows a lot about astronomy, and astro-physics, could you please try to scientifically explain this? The same shape appeared on Jupiter about a year ago...

hi, when modelling the shape of a hydrogen atom orbital, is it the real part of the spherical harmonics that i plot? thanks

1. Volume of a shape with a different trapezium at each end. Trapezium 1: a(top side) = 65.5m, b = 35.5m, h = 3.5m, height above sea level = 3m. Trapezium 2: a = 53m, b = 17.5m, h = 3m, HASL = 1.6m. Trapezoids are parallel and 48m apart. Their horizontal centres are aligned (as in sections of...

Hello, I'm creating a slide-show presentation that describes how a shape charge explosion (namely that of an improvised explosive formed projectile) is more effective than that of a bullet projectile. I would like to include visuals and equations which describe how the initial explosion...

Hello all! I am looking for a method to calculate or model a resistance of a complex 3-D shape. For example if I have the resistivity of a material, and I know the shape (let's say a cone), I would like to be able to model the resistance which this shape will produce. I am looking for...

Homework Statement Identify evidence that the shape of an object affects it's free-fall acceleration Examples would help. Homework Equations N/A The Attempt at a Solution Wind resistance would be different for an egg as compared to a rubix cube

What's the shape of the planets orbiting the sun in our solar system according to this website http://www.chacha.com/question/what-is-the-shape-of-orbit-of-planets they are elliptical. But in a documentary (maybe history channel's "The Universe", but I'm not sure) I heard that our solar system...

Homework Statement ____ l _ l l_l l_l Find the y-coordinate of the center of mass. Each side l / _ is length a. I got an answer of 1.25a, but that isn't right. Homework Equations The Attempt at a Solution Area of each section * x-coordinate of center of mass. (the area...

Is the notion of spherical shape of nuclei well proven by experiment? Could someone please direct me to a relevant source?

Hello Again Regarding photons: Is there any small transient time lag or "ramp up" between their point of emission and their full speed. In other words do they go Zero to 186,000 miles per second in all of an instant? And have there been any experiments to see if this is an instantaneous full...

why rainbow has a shape of arc and why its "ends" are bent down. Can anyone explain why rainbow has a shape of arc and why its "ends" are bent down.

Homework Statement Assume that when the curve C shown below is revolved about the x-axis, it generates a surface of revolution with the property that all light rays L parallel to the x-axis striking the surface are reflected to a single point O (the origin). Use the fact that the angle of...

Homework Statement In a particular application, the generator output is converted to DC and used to power an immersion element for water heating. 1). Sketch the shape of the output voltage at a rotation speed of 300 rpm assuming the amplitude on each phase is 30V? The Attempt at a...

I am wondering if anyone knows of research being done, or theories that are related to the actual structure of space-time as they are related to physical constants such as the speed of light, Planck's constant, and the cosmological constant. I'm far from being a expert, but I've been playing...

Hello, So I was wondering how I would measure and or quantify the shape of a sequence of data values with two values (an entry and an exit angles to/from the max) Say we have a set of values like: 0,5,10,5,0 If we assume the x-axis incremental is by 1 and plot this on graph paper we...

Hello, I was just wondering if anyone has used the software Mathematica 7. I heard it's a really good program and with the new functions it looks great, i was just wanted to get some good user feedback from people who definitely know what they're talking about. Thanks! P.S. - as a side note...

For a given spatial volume and amount of material, what practical structural design conserves temperature best?

Hiya guys, i have a quantum well in strange notation I have never seen before. I think i can do the question, i just need to know the shape of the well. If someone would be so kind to draw me a shape (I think its a step but not sure?). It is: dphi dphi...

The Scherrer equation is used to determine crystallite sizes from XRD spectra. they contain K, a shape factor, that varies from 0.89 for spherical to 0.94 for cubic particles. Usually, this is set to 0.9 for particles of unknown size. Does anyone know where we could find a table with the exact...

What is the shape of a free electron wave? Is it a sinusoidal plane wave like an EM wave? Does it expand laterally like an EM wave? I'm thinking the answers to these questions is yes because the double slit experiment works for electrons. But I'm not totally sure. Thanks! Jake

I have been out of class for really long, I don't remember anything, I have lately become interested in transformation of one shape into another. :confused: Is this also about topology ? If so, I would like to know how you can define such a beautiful transformation ? It is just so strange to...

why do they form the shape they do? that is after a nuclear explosion i'm familiar with thermodynamics and fluids ect..., does it have something to do with archimedes principal?

Does a black hole have "shape?" Today I was watching the Science Channel and a program on the Hubble telescope was on. It was said that pictures of black holes have been taken not by the Hubble, but by another similar device that takes pictures of Gamma and/or X rays. This...

This question was posed to me a while ago, but I never fully understood how to solve it. You have a particle in the first excited state of the infinite square well (with the origin taken to be at the center. You "abruptly" change the shape of the potential well to be that of the harmonic...

iam sorry if this is crackpottery,but is it true that a 4 dimensional figure*called the tesseract has been constructed,i came across this over the net.*kindly rebuke me if iam not abiding with the rules of pf.

Homework Statement What determines the shape and spacing of equipotential lines?Homework Equations NoneThe Attempt at a Solution I think the fact that equipotential lines have to be perpendicular to the surface determine the shape of the lines. I'm not sure what determines the spacing. Is it...

is the cmb radiation redshifted the same amount in ALL directions? as i understand the data, redshift is a function of distance between 2 points only(scalar quantity). is there a an angular component as well (vector quantity?) does the fact that there is a 'dipole' mean that the universe is...

I have been told most of the planets around the sun have orbots elliptical in shape. I now understand that the orbits are formed due to 2 forces. i.e gravity of the parent body acting against the velocity of the orbitting body. The above only tells me that all orbitting objects should...

is there an exact way to calculate the volume of a shape where one shape is revolved around a parabolic curve (obviously with limits). i don't know much about this stuff but I am pretty sure u need to integrate it. the shape revolved is a rectangle (vertical) with a triangle connected at the...

So I'm not sure if this is the right place - and its a crazy question - but I am trying to get something to spin and/or flip when I put it in a beaker of water, just by its own weight and gravity. I have tried a maple seed shape, propeller shapes, simple curls, sprials, Rocchetti pasta shapes...

I am looking for a "good" way to triangulate a closed concave shape of vertices and edges. "good" is quite a vague term, but the basic principles I'm interested in are: 1) Minimize "sliver" triangles that are very thin and contain really small angles. 2) Must be reasonable to compute...

I know acceleration vs mass graphs are curved, but why? also, how would i calculate an uncertainty?

Homework Statement This isn't actually a homework question (well it is for homework). Basically for one of our projects we had a motor pull a cup through an upside down parabola shape. The motor was located off-axis in comparison to the parabola. The cup started from zero, then as the motor...

why are the orbits elliptical in shape?i know that force equations give differential equations whose solutions imply that the orbits elliptical in shape.but what is the particular physical reason behind it?

This is a very simple doubt, since pressure is force per unit area, if I place an object with say one side twice the area of the other underwater ( or even in the atmosphere ) wouldn't there be twice as much force on one side? ( the one with larger area ) and shouldn't that make the object move...

If a cylindrical magnet with a uniform magnet field were to be rotated at high speed along its polar axis (assuming the poles to be at either end of the cylinder) would there be any change or distortion to the shape (ie pattern of field lines) of the magnetic field?

Just wondering about the shape of a light cone. On the attachment below, if I were standing at A and pointed a flashlight in the positive time direction, it would form the cone show, correct? Is this cone a perfect cone? For instance, if I were standing on the north pole and pointed a...

I'm trying to construct a lens model, and having trouble because I want to portray a perfect lens rather than one with spherical aberration. It's proved impossible to find via Google, although I did find an earlier thread on this forum that was helpful. From what I can gather, the lens needs...

My kitchen window looks into an (out house) the out house is where i keep my bikes so it is securely locked. So at night i am cooking a meal and see my reflection in the window just as clear as in a mirror. I am wearing a stripey jumper which also shows clearly in the reflection, as i move...

I have never come across this term before in my few years of chemistry. At first, i thought it meant molecular shape, such as "trigonal planar" or linear. But apparently, that is not the case. Apparently, it is in some form of AX2E (2 being a subscript), but that's all i can find on the matter...

The mass is constant, and there is a varying force. So would the mass be the dependent value(y-axis) and the acceleration be the independent value(x-axis)? I think the mass is the dependent value so when I graphed it the line went straight across(horizontal). Is this right? I'm really...

"Shape preserving" fitting algorithms Does anyone know if there is such a thing as a "shape preserving" fitting algorithm? Now and then I run into the following problem: I have a set of rapidly varying data and try to fit it using an equation with e.g. 5 unknowns; I know that I can make it...

Find the volume of the following figure, its just one part of a larger problem which is to find the center of gravity of a machine element. I know how to figure everything else out but I'm not sure how to find the volume of this shape so I can finish the problem No equation was given to find...

It has been my understanding from various articles I've been reading by Jeff Weeks and others that there was a strong belief that the shape of the Universe was the Poincare Dodecahedral Space (PDS), based upon the WMAP data's missing certain larger frequencies and the given range for the...

I hope someone can help with this - its been driving me mad for a while now! You will have noticed the shape coffee (or whatever liquid) takes when you stir it. Clearly a vortex getting deeper and steeper the faster it is stirred. So - here's my problem. What's the equation that defines...

I came across this website: http://www1-c703.uibk.ac.at/mathematik/project/bildergalerie/gallery.html and was excited to see that they had a visual representation of each equation. I am curious however as to how they derived a shape from an equation. Any help would be appreciated. Thanks.