What is Shape: Definition and 635 Discussions

A shape or figure is the form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture, or material type.
A plane shape, two-dimensional shape, or 2D shape (plane figure, two-dimensional figure, or 2D figure) is constrained to lie on a plane, in contrast to solid figures.

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  1. qnach

    Antenna of this shape? What is the benefit?

    Is there a (dielectric) antenna of this shape ---o---o---o---o--- | | | | ---o---o---o---o--- i.e. a ladder? What is the good for such antennas?
  2. wolram

    B Shape of Universe | Is It Same from Every Point?

    This may be a silly question, but how do we give a shape to the universe if it is The same from every point we look?
  3. Wes Turner

    B Finding the Equation to Place RGB=255 128 0 on a Long Thin Shape

    I have a long thin shape (rope, bar). The color of the shape changes smoothly from red (RGB=255 0 0) at one end to yellow (RGB=255 255 0) at the other. I need an equation that will allow me to adjust the G value from 0 to 255 in a way that I can choose where on the shape it has the value 127.5...
  4. M

    Shape of water in a rotating container along A vertical axis

    Hi! I am currently working on a project that includes rotating a water-filled container. The container is NOT spinning about its vertical axis, but about the vertical axis of the rotating disc. I am aware that the surface shape of water in a rotating bucket takes the shape of a parabola when it...
  5. T

    I Shape of infinitesimal volumes

    In physics we often use objects with infinitesimal volume. An example is the infinitesimal volumes that we use to calculate the electrostatic field knowing the charge distribution. Very often in the books i studied these infinitesimal elements are represented as infinitesimal cubes. My question...
  6. O

    Unit cell conversion and shape of fuel pellet

    As you may know, below is the conversion process of square unit cell into circular shape in order to calculate the thermal utilization factor (f) for a lattice. As far as I know, it is really difficult to make a simulation for which a lattice is constructed as a circular fuel and square...
  7. F

    Phase transformation in shape memory alloys

    Dear all, As part of my MSc thesis I am using molecular dynamics simulation to study the pseudoelastic effect of Cu-Zr shape memory alloy during a tensile and shear tests. My question is related to the stress induced phase transformations during both tests. During the tensile test I can...
  8. T

    I Shape of Vacuum Space: Constant Spatial Volume with Time

    If we have a small 4-volume of empty spacetime of boxlike dimensions t, x, y, z, then according to the vacuum field equations the change of the shape of this box with respect to time is (I think): \frac{d (xyz)}{dt}=0 or equally: yz\frac{dx}{dt}+xz\frac{dy}{dt}+xy\frac{dz}{dt}=0 in other words...
  9. O

    What shape would the Earth appear to have if it were just covered by water

    Hello all, I was going through study of gravitation of earth. The book teachs that gravity of Earth is more near poles than at equator as Earth is not perfect sphere rather radius of Earth is lesser near poles larger at equator. A thought came in my mind that if the water at level goes also...
  10. V

    Finding the magnetic flux from a 3 Dimensional Shape

    Homework Statement In Fig. 32-9 there is a + x-directed uniform magnetic field of 0.2 T filling the space. Find the magnetic flux through each face of the box shown. Homework Equations ΦM = B ⊥ A = BA cos θ The Attempt at a Solution My attempt is attached to this post. How do I determine which...
  11. P

    B Question about the shape of the Universe

    If the universe was all created simultaneously in the Big Bang then why is it that all matter does not move at the same rate in relation to all surrounding matter away from the singularity causing all matter to basically form a massive increasingly expanding sphere with some significant width...
  12. M

    MHB Divergence Theorem and shape of hyperboloid

    Hello! I have been doing a previous exam task involving the divergence theorem, but there is a minor detail in the answer which i can't fully understand. I have a figur given by ${x}^{2} +{y}^{2} -{z}^{2} = 1$ , $z= 0$ and $z=\sqrt{3}$ As i have understood this is a hyperboloid going from...
  13. weezy

    E field of a conductor with an arbitrary shape enclosing charge

    In this image charge q is enclosed within an arbitrary shaped conductor. I'm asked to find what if the Electric field in regions 1,2,3,4 are uniform and if the surface charge densities on the interior wall of the arbitrary shaped conductor and the hollow sphere conductor are uniform. My...
  14. C

    B Shape of Universe & Cosmological Principle

    Let me preface this post by saying that I only have a very cursory understanding of general relativity. I happen to know that if we assume the cosmological principle, then the hypersurface ##\Sigma_t## of the spacetime manifold ##M##, for any positive ##t##, is either a 3-sphere, a...
  15. J

    I Lorentzian line shape integration

    Hi, I know this might be a bit dum but I'm currently stuck with this integral. In this link: http://www.pci.tu-bs.de/aggericke/PC4e/Kap_III/Linienbreite.htm I know he's doing the right thing, but I really don't understand the integral of a(omega). How come it is E(1/(i(ω-ω0) -γ) -...
  16. Ephemerality

    I Is this an accurate article on the shape of a photon?

    I came across this article on the shape of a photon https://cosmosmagazine.com/physics/what-shape-is-a-photon However, the first image confused me, is it showing the wave function? Most other questions regarding what a photon "looks" like seemed to dismiss the question.
  17. D

    Recreating a mathematical 3D shape

    Hello, I am trying to recreate a shape shown in the attached photo, from the attached article I have tried to create this shape in MATLAB as shown in the code bellow , from this formula i get a 2D shape and not the shown 3D shape , how to create this 3D shape? Thankstheta_0=15; alpha=60...
  18. Bill McGrath

    Adding a shape to make a disc spin?

    I'm basically familiar with wings and lift. I've run into an issue with a sculpture I'm making. I have constructed a 48" disc of 1/16" perforated steel framed in a 1/4" thick by 1 1/4" steel rim. I want to attach bearings to opposite sides of the rim and allow it to spin in the wind, but I sense...
  19. sammy g

    I Best shape for photon tracking software

    I need to determine the best boundary shape for tracking photons being emitted from a cesium 137 DISK SOURCE that would be hitting a POINT DETECTOR 50 cm away. The cesium is not contained by anything, it is only traveling through air. What I mean by boundary shape is: the software tracks...
  20. bluejay27

    I Exploring the Parabolic Shape of Holes vs Electrons

    Why is the parabolic shape for the hole broader than that of the electron?
  21. DuckAmuck

    I Minimal Surface shape with gravity

    Minimal surfaces are sort of the "shortest path" but in terms of surface shapes. So I figured I could characterize the shape of a hammock by adding the influence of gravity, much like you can get the shape of a catenary cable (y=cosh(x)). The equation of motion I get from the Lagrangian is...
  22. UsableThought

    News Does 'pack journalism' shape the science news we read?

    This is old news by now, but having just visited the Christian Science Monitor's rather sparse online site, I thought I would browse their science section, which is even sparser; and came across this story from 2016 about the time that EurekAlert! was hacked. The interesting point to the story...
  23. Berker

    Motion of 4 charges positioned in a square shape

    Homework Statement Four particles with equal charges q and equal masses m are placed on a plane so that they form the corners of a square with side length a. The charges are then released from rest at this configuration (shown as (i) in the figure). After the release, the particles accelerate...
  24. K

    I Size and shape of a black hole singularity?

    How and if singularity is related to Plank size (h) , are they be related ? If they are; can the singularity have squared shape (like pixel) , if it is h size so that is the "smallest" understand by "physics" and any curve (circle) would break the rule of h begin the smallest ? Does my question...
  25. MathematicalPhysicist

    I Shape of the universe -- Does it change with time?

    Are there any cosmological models that say that the shape of the universe changes with time? As in it may oscillate between being a sphere, torus , saddle or a plane? I remember the course in Astrophysics that I took in my BSc studies, and we had it that the shape of the universe depends on...
  26. qnach

    Why is the S-shaped antenna design popular?

    The left figure is the top view the right one is the side view. I would describe it as an S shape... Why do people design such an antenna?
  27. qnach

    Is there an antenna with this shape?

    Is there an antenna of S shape or perhaps a butterfly shape? What is the benefit of such design?
  28. H

    I What causes alternator waveform shape?

    I have a permanent magnet alternator. It does not produce a sine wave output, but rather a sort of distorted triangle wave. I did a frequency analysis on it and it showed a series of harmonics. The strongest was the third, with each odd harmonic getting progressively less powerful. It also...
  29. K

    I Understand Shape of Universe: Spatially Flat?

    What actually means to say that the universe is spatially flat? Would it be that, if one could extend two straight rods of infinite length (assuming a universe with no boundaries and infinite amount of material for making the rods, LOL), they would remain parallel?
  30. Davide Fabri

    Induction Heating Coil Design: Rectangular vs. Spiral Shape

    Goodmornig everybody, I'm working on the design of a power converter for high frequency induction heating. The induction coil should be a flat spiral (pancake) with a rectangular shape, but my customer would like to design it as shown in the following picture. I think it will not work because...
  31. Cocoleia

    Derive the equation for the shape of an orbit

    Homework Statement I am given this equation: where m and M are masses. I have to obtain the following as a final result: Homework EquationsThe Attempt at a Solution so far, I have done this (This may not be the most efficient or the easiest way, but it is how my professor wants it to be...
  32. caters

    Best Tunnel Shape for X,Y,Z Coordinates

    Homework Statement X,Y,Z(coordinates) What function corresponds to the best tunnel shape? g = 9.8 m/s^2(earth gravity) Homework Equations F(x)=Y G(x)=X^2 in the xy plane G(z)= sin(X) in the xz plane H(x)= parabolic sinusoid(X^2 and sin(X) both in the xy plane) The Attempt at a Solution I have...
  33. C

    Shape of bending moment diagram

    Homework Statement in this question , I'm asked to draw the bending moment diagram and shear force diagram Homework EquationsThe Attempt at a Solution I don't have the ans for this question , can somoene check thruough my shape of graph . I'm not confident with it . [/B]
  34. A

    Traveling Wave on a String: Shape Retention & Direction/Speed

    Homework Statement [/B]A traveling wave on a string is described by , 0.0050 sin[4.0 (rad/s) t + 0.50 (rad/m)x] . (a) Does this wave retain its shape as it travels? (b) In what direction does the wave travel? (c) What is the wave traveling speed? Homework Equations None. The Attempt at a...
  35. P

    I What shape is the ecliptic as seen from Earth?

    I want to build a model of how the ecliptic interacts with the horizon. The horizon appears to be a flat circle, so I thought I'd use a CD sized shape for that. What shape would I use for the ecliptic, and how large relative to the CD? I would like it to be as close as possible to the my...
  36. J

    Need help to calculate a volume of a shape

    Hi, I am looking for a formula to have the volume of this shape. Here is how we draw it: Thank you for your help :)
  37. Vajhe

    What shape does a deformed body take after being stretched?

    Hi, I have a problem that I'm trying to solve and I'm not sure at all how can I proceed. If we have a metal rectangle (or maybe a rectangle-shaped hole in a piece metal), and we stretch this body a small distance, what is the shape of the top and bottom lines of the body? Can we say it is a...
  38. DuckAmuck

    A Shape of a pinned canvas w/ Lagrange Multipliers

    I'm basically trying to understand the 2-D case of the catenary cable problem. The 1-D case is pretty straightforward, you have a functional of the shape of a cable with a constraint for length and gravity, and you get the explicit function of the shape of a cable. But if you imagine a square...
  39. berkeman

    Automotive Wheel well fender shape -- aesthetics or aerodynamics?

    I've noticed that many later-model sport sedans and some other vehicles have a new shape for their wheel well fenders. The fenders flare from the car body, and end with a several centimeter flat section before the wheel well. It seems to be a feature across several car brands and models, and...
  40. arupel

    A Shape of the Universe: Is it Infinite or Finite?

    Just like to get an idea of what people currently think what the shape of the universe is. Since the curvature is likely zero, does this mean that the universe is infinite. Also, I get the idea that the size of the universe, if has one, extends beyond the light cone. How is this possible?
  41. I

    B Shape of elementary particles in QFT, etc?

    Hello, I hope this is not a stupid question as I am not a physicist. But I was curious about how contenders for the so-called Theory of Everything view the shape of the elementary particles. I know that the basic idea of string theory is related to the shape of elementary particles as one...
  42. V

    Calculating elastic modulus in a certain shape

    http://imgur.com/oLMkHBX How exactly would you calculate E in this? The cross section is a square and it deforms .8 mm. I'm not quite sure what to do since obviously the size of the cross section changes.
  43. Tazerfish

    I Can every shape precess like a top (toy)?

    The main question is in the title. 1.I have wondered if a regular pencil would precess and rotate stable for multiple seconds if spun fast enough. [Coins, plates, bowls and similarly shaped objects can rotate in a stable way for extended periods of time. And a lot of other household objects...
  44. S

    I Godel Solution Metric: Shapes & Descriptions

    Here is the Godel solution: ds2 = -dt2/(2ω2) - (exdzdt)/ω2 - (e2xdz2)/(4ω2) + dx2/(2ω2) + dy2/(2ω2) Here is the metric tensor for it: g00 = -1/(2ω2) g03 & g30 = -ex/(2ω2) g11 & g22 = 1/(2ω2) g33 = -e2x/(4ω2) Every other element is 0. Now to my question: What shape is this metric? To clarify...
  45. G

    Solving Long Mach Nozzle Shape Problem for MBMS

    Hi y'all, thanks in advance to anyone who knows a bit more about compressible/isentropic flow than me for the help, I have an interesting problem which I've been working on for a bit. Basically, I would like to measure species coming out of a reactor using molecular beam mass spectrometry...
  46. E

    B What is empirically known about the shape and size of the Universe?

    It may be that nothing is, or even can be empirically known about exactly how big our universe is, or the shape of its geometry (flat, round, etc.), but what are some basic, provable facts that can be used to work out a theory or to debunk one? I know this is a very broad question. I have come...
  47. G

    B The shape of the body in Stefan Boltzmann Law modern use

    Hello, It looks like Stefan Boltzmann Law can be used for a lot of different purposes: to calculate the temperature of stars, sun, temperature of the Earth's sky, temperature of particular surface, wall, the radiation emitted by the body by knowing its temperature, and so on. What confuses me...
  48. A

    Relation of shape of bottle to water pressure

    So, I know that according to everything online water pressure is independent from everything except gravity, height, and density of fluid. The situation I'm talking about is slight different. Imagine a standard water bottle that angles inwards near the top. Now imagine a point on the side of...
  49. Z

    I What are some ways to 'mold'/change the shape of a flame?

    What are some ways I can go about change the shape of a bunsen burner flame, specifically in a linear shape of around 4cm
  50. G

    Determining the surface area on a 5 sided lunar esque shape

    Homework Statement I'm trying to figure out the surface area on a 5 sided shape where the sides can all be modeled by "lunes". The shape will end up looking like a banana peel. We are modeling the sides of the shape as lunes with varying angles on a sphere of radius 3 inches. I'm trying to...
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