Plate Definition and 1000 Threads

As minor planet discoveries are confirmed, they are given a permanent number by the IAU's Minor Planet Center (MPC), and the discoverers can then submit names for them, following the IAU's naming conventions. The list below concerns those minor planets in the specified number-range that have received names, and explains the meanings of those names.
Official naming citations of newly named small Solar System bodies are approved and published in a bulletin by IAU's Working Group Small Body Nomenclature (WGSBN). Before May 2021, citations were published in MPC's Minor Planet Circulars for many decades. Recent citations can also be found on the JPL Small-Body Database (SBDB). Until his death in 2016, German astronomer Lutz D. Schmadel compiled these citations into the Dictionary of Minor Planet Names (DMP) and regularly updated the collection. Based on Paul Herget's The Names of the Minor Planets, Schmadel also researched the unclear origin of numerous asteroids, most of which had been named prior to World War II. This article incorporates public domain material from the United States Government document: "SBDB". New namings may only be added to this list below after official publication as the preannouncement of names is condemned by the WGSBN.

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  1. L

    Where are the maximum stresses located in a thin plate with opposing forces?

    Hello, I need some help (or a lot) of calculating where and how much the maximum stress is in a plate as seen in my attached figure. It´s a thin plate (1mm) that is designed as my picture and it has two forces acting in opposite direction. How do I calculate where the maximum stresses...
  2. Y

    Question on finding inductance of parallel plate transmission line.

    Find the inductance per unit length of parallel plate tx line width = w and space =d between the two plates. w>>d. My question is whether the total inductance is twice the calculate inductance because total inductance is the sum of inductance of the top and the bottom plate. But it seems all...
  3. J

    Acoustic Levitation: Reflector Plate Challenges

    Hi everyone, I'm working a on a project involving acoustic levitation. Right now we're trying to finish up construction of the apparatus. In particular, the reflector plate is proving to be slightly difficult. The transducer we're use has a resonance frequency of about 29.95 kHz. As far I...
  4. H

    Calculating Spring Force for a Multi Plate Clutch

    A multi plate clutch has 4 frictional surfaces, imternal diameter 120mm and external diameter 200mm. The coefficent of friction is 0.3 What spring force will be required to transmit 20KW of power at 1440 RPM if the clutch is under uniform pressure conditions?
  5. C

    Want help about throttling oriface plate

    Does anyone specialize in throttling oriface plate ? I want some information about that.can you guys recommend some books to me ?
  6. F

    Find Potential, Grounded Infinite Plate and a Dipole

    Homework Statement [PLAIN]http://img846.imageshack.us/img846/1269/img029z.jpg 2. The attempt at a solution My attempt and relevant equation is only there in the picture. I know how to find the electric field of an infinite plane np, gaussian pillbox etc. im not sure what role...
  7. J

    Anyone understand starved plate designs?

    Anyone understand "starved plate" designs? I'm trying to get a good understanding of "starved plate" designs used for some tube amplifier effects. I understand that they operate at very low voltages but what else is meant or implied by the starved plate? What is the theory of operation?
  8. L

    How Does a Dielectric Constant Affect Capacitor Charge?

    Homework Statement A Parallel Plate Capacitor connected to a 12 V source is charged to 21 micro coulomb. If the capacitor is filled with an oil of dielectric constant 3, then the charge stored is --- Homework Equations The Attempt at a Solution C = q / V, substituting the values i...
  9. tiny-tim

    Tiny-tim's proof: force on a capacitor plate

    is this a valid proof? it seems very simple, and gives the correct result, but i can't find it in a book, so perhaps there's something fundamentally wrong with it? Given an infinite parallel plate capacitor, what is the force per charge on either plate in terms of the electric field, E...
  10. R

    Vacuum Energy and the Casmir Plate and Electromagnetics

    See followup for clarification and simplification of the question. I have a challenging question about electromagnetics, vacuum energy. I'd appreciate any leads on clearing up any of my misunderstanding. I presume if two antennas were designed to broadcast the same signal, but were designed...
  11. J

    Maximum Charge on Parallel-Plate Capacitor with Mica Dielectric

    Homework Statement A parallel-plate capacitor is made from two aluminum-foil sheets, each 3.80cm wide and 15.0m long. Between the sheets is a mica strip of the same width and length that is 0.0225mm thick. What is the maximum charge that can be stored in this capacitor? (The dielectric...
  12. C

    Plate Tectonics: Calculating Collision Time for Distant Continents

    Typical motions of one plate relative to another are 1 centimeter per year. At this rate, how long would it take for two continents 3,000 km apart to collide? I don't know where to start or what formula to use.
  13. B

    What is the effect of unequal charges on a parallel plate capacitor?

    Homework Statement Ok so when you have a parallel place capacitor with a charge +Q on one plate and -Q on the other, you can use Q = CV etc., My question is: what happens when the two charges differ - i.e. one plate is Q1, the other is Q2. What is the capacitance, potential difference etc...
  14. L

    How Do You Calculate Electric Field and Potential in a Parallel Plate Capacitor?

    Homework Statement A parallel plate capacitor has a charge of 50pC area = 10mm^2 dielectric material permittivity = 2.5 distance between plates = 0.5 mm find the electric field the potential difference between the 2 plates the energy stored in the capacitor Homework Equations...
  15. P

    Ohm's Law - current within parallel plate capacitor imbedded in a large volume

    Homework Statement A parallel plate capacitor with plates of area A and separation d is imbedded in a large volume filled with a material with electric conductivity σ. Determine the total current I if the two capacitor plates are maintained at a potential difference Vo. Explain how such a...
  16. O

    What is the formula for bending stress of a plate with a central point load

    I have a steel deck (a) 2000mm x (b) 4200mm overall comprising 12.5mm durbar plate (grade S275) welded to RSA ribs at 400mm spacings, the plate is unsupported in the other plane (4200mm span) with the exception of end plates. I wish to drive a forklift truck over the plate with a wheel load of...
  17. B

    Capacitor behaviour (force, electric field, charge and plate distance)

    Homework Statement http://dl.dropbox.com/u/14443433/Screen%20shot%202011-02-25%20at%2011.02.23%20AM.PNG Homework Equations Q = C*V E-field = V/d F = E*q C = epsilon-naught*A/dThe Attempt at a Solution A. false based on F = E*q = Vq/d = C*V^2/d B. true based on the inverse...
  18. S

    Dielectric Filled Parallel Plate Capacitor Question

    Homework Statement A parallel plate capacitor has rectangular plates measuring 44.0 cm by 30.0 cm, and can be charged to 1600 V maximum ΔV without electrical breakdown. The gap between the plates is fulled with mylar dielectric (κ=3.2). Find the thickness of the dielectric.Homework Equations...
  19. O

    Dielectric and Parallel Plate Capacitor

    Homework Statement A 4.0-nF parallel plate capacitor with a sheet of Mylar (κ = 3.1) filling the space between the plates is charged to a potential difference of 120 V and is then disconnected. (The initial capacitance including the dielectric is 4.0 nF.) (i) How much work is required to...
  20. L

    How to find B field in paralle plate capasitor

    Homework Statement how to find B field in parallel plate capacitor the plates have a length L and width w and separated a distance h Homework Equations B dl=\mu I The Attempt at a Solution I am trying to find the B files i thought u would use B dl=\mu I but the book has the...
  21. P

    Why doesn't my magnet stick to the hhd magnetic plate?

    I opened my harddisk and put a magnet on the plates but the plate acts like a piece of wood. I would expect the magnet to stick to the plate. It is a magnetic plate afterall! My "magnet" is in fact a row of neo cube balls which are quite strong magnets and small. So I would surely feel or see a...
  22. M

    What is the net torque on a pivoted metal plate due to three forces?

    Homework Statement A square metal plate 0.180m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown in the figure if the magnitudes of the forces are F1 = 18.0 N, F2 = 17.0 N...
  23. B

    Electric Field Near Flat Metal Plate: Factors & Components

    Homework Statement Explain the factors that determine the parallel and normal components of the elctric field near to the surface of a flat metal plate Homework Equations The Attempt at a Solution No idea what this question wants..? Is it something to do with the smoothness of...
  24. B

    How much charge on a plate needed to lift it against gravity?

    Homework Statement A thin uniform metal disk lies on an infinite conducting plane. A uniform gravitational field is oriented normal to the plane. Initially the disk and plane are uncharged; charge is slowly added. The mass of the disk is M, and its area is A. What value of charge density is...
  25. B

    Designing Test Plate for Leak Rate Test on Butterfly Valve

    I need help in designing a test plate for a leak rate test on a butterfly valve. The test must be performed in the field which complicates things. The engineer that is helping with this has come up with a plate that is 25" in diameter and 1 1/2" thick carbon steel. This is not rational...
  26. P

    Parallel plate capactiors otherside plate

    how can it be proved that the otherside of the charged parallel plate capacitor has some charge on it
  27. Y

    Question on TEM wave travel in parallel plate transmission line.

    I want to confirm that the TEM wave is actually travel inside the dielectric between the two plates of the parallel plate transmission line. So even though surface current and surface charge appeared on the surface of the conductor plates as the consequence of the boundary conditions between the...
  28. M

    Electric field at some distance from a plate?

    Homework Statement A thin horizontal 0.1m by 0.1m plate is charged with 10^10 electrons. If the electrons are uniformly distributed on the surface, what is the strength of the electric field 0.0001m above the center of the top of the surface of the plate? Homework Equations Eplane =...
  29. P

    Formula for a non-uniform distributed load on a flat plate

    Homework Statement I am writing a MATLAB code to predict plate displacement for multiple load conditions using the rayleigh-ritz method. I have gotten the first three loads but I am struggling with the last load case. I need to represent a distributed load for a flat plate that is piecewise...
  30. A

    Electric field in plate capacitors

    Homework Statement A small plastic ball of mass 5.54 x 10-3 kg and charge +0.174C is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0o with respect to the vertical. The area...
  31. T

    Charging a parallel plate capacitor.

    I'm building a parallel-plate capacitor for a capacitance sensing circuit. If I let the capacitor fully charge, and then pulled the plates apart by 5 cm, how would that change the capacitance? Is there a formula to figure that out?
  32. M

    Parallel Plate Capacitor Question (Many Attempts)

    I have tried this set of questions which is from i-vii, I believe I am going wrong at a certain stage, as at question vi, the voltage is clearly wrong, below is the questions and my attempt. Sorry for the long post, any help on pointing out where I have gone wrong would be much appreciated...
  33. L

    Formula's To Work Out Inside Diameters Of A Cluth Plate

    Okaii this is my question : "A Twin Plate clutch has an outside diameter of 554mm and a width of 219.8mm. Tests of the clutch lining on stell, show that a block of 3Kg requires a force of 11.78N to move it. The spring force is 2.98kN. Calculate the torque this clutch can transmit" I no...
  34. M

    Force on a plate due to an air jet

    1. I am trying to come up with an explanation as to why the force on a plate as provided by a jet of air, does not vary with the distance from the plate. We set up in a lab a vertical pointing air jet giving a constant output and gradually increased the height of the plate above the jet whilst...
  35. M

    What is the Capacitance of a Parallel Plate Capacitor with a Dielectric Sheet?

    A parallel plate capacitor is defined of two circular plates with a radius of 12cm, it is separated by a dielectric sheet with a thickness of 2 microns (um) and relative permittivity of 6. It is charged with a potential difference of 110V. The area of one plate I found is A=pie*R^2 =...
  36. M

    Steady State Temperature Distribution inside a plate of infinite length

    Homework Statement Consider a rectangular metal plate 20 cm wide along y-axis and infinitely long in x as shown in the Figure below. The two long sides and the far end are held at 0ºC and the short side along y-axis has the temperature distribution T (y) = y, that is at a point y in cm...
  37. K

    Calculating Potential Difference in a Suspended Parallel Plate Capacitor

    Homework Statement A small object with a mass of 420 mg carries a charge of 30.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 2.00 cm. If the thread makes an angle of 18.0° with the vertical, what is the potential...
  38. P

    Find Center of Mass of Thin Plate w/ y^2=4Ax & x=A

    Suppose that A is a positive constant. Find the center of mass of a thin plate covering the region bounded by y^2= 4Ax and the line x=A. Assume that mass density at (x,y) is proportional to x. y=sqrt(4Ax) K is what I am saying is proportional to x xbar=My/m ybar=MX/m Im not...
  39. M

    Winterize truck with steel plate?

    Hi Kind of a random question, I know, I just think this is a great place to get a answer. Anyway, I have a single cab pickup truck. So of course I have a very light back-end, to compensate for this in the winter for more traction I have been putting in a solid steel plate my Dad bought...
  40. C

    Parallel Plate Capacitor - Dielectric Oscillator

    In my high school calculus-based electricity class two students and I are trying to create a demo where we set up a parallel plate capacitor and have some dielectric material inside it that we can pull out slightly, and have it oscillate into and out of the capacitor. Some ideas we have...
  41. R

    Resistance calculation of odd-shaped plate

    Hello If the resistivity rho and the dimensions are known, any schoolboy can calculate the end-to-end resistance of a strip of metal. But how do you do it if the strip is not regular as in the image?
  42. M

    What if capasitor plate in different size

    hi.. cant set both site fit face face.. ( not meaning paralel) if make one side I mean plate much bigger.. and athor plate respectivel small (whic calculated area..) .. So what happens.. I think I could use small one while callculating Area.. ? 2. if I am not iright is there any mistake...
  43. C

    (E&M) Charge and electric field in a two plate system.

    1. Two metal plates, 10 mm thick, are held a distance z=40 mm apart with a potential difference of 10 V across them. As you look at them the positive plate is on the left. In between the plates is a vacuum. Ignoring edge effects and assuming unit area for the plates, calculate both the charge...
  44. C

    Center of mass x-coordinate of a metal plate

    A uniform flat plate of metal with dimensions 10x 12 is situated in a reference plane with its bottom left hand corner at (-2, -6) and its upper right hand corner at (8, 6). The plate has a circular hole cut out of it centered about (4,0) with a radius of 2. Find the x coordinate of the center...
  45. M

    Torque on a square plate with multiple forces acting on it

    Homework Statement A square metal plate .18m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque of the 3 forces acting on the forces. The magnitudes of the forces are F1= 18N F2=26N F3=14N. *** picture a square with...
  46. M

    What is the electric field above an infinite plate with a given charge?

    Homework Statement From Resnick and Halliday: A metal plate 8 cm on a side carries a total charge of 60 microC. Using the infinite plate approximation, calculate the electric field 0.5 mm above the surface of the plate near the plate's center. Homework Equations (1) E =...
  47. K

    Double Layer Parallel Plate Capacitor

    Homework Statement d=10cm; U=180kV; er1=5; Ep1=50 kV/cm; Ep2=30 kV/cm; Ep=breakdown strength. So you have a Parallel Plate Capacitor with two layers between the plates. One is air and it has the Ep2=30kV/cm, the other one has a Ep1=50 kV/cm and a relative permittivity of 5. The capacitor is...
  48. B

    Emag/electrodynamics: E field in air above glass plate

    1. The plane boundary between a sheet of glass and the air lies in teh x-y plane. There is a uniform surface charge density σf= 2.0μ Coul/m2 on teh surface of the glass. The permittivity of the glass is ϵg = 3.2ϵ0. The permittivity of air is ϵ0. The electric field in the glass is E = 3000 N/Coul...
  49. F

    Solving for Refraction Angle of Light Ray Across Parallel Plate

    Homework Statement We have a parallel, transparent plate. The plate has an incidence of refraction that is dependent on a transverse coordinate. (i.e. the plate is perpendicular to z direction, and the refractive index changes along x direction) n(x) = 1.5/(1 - x/0.13) It is observed...
  50. D

    How to Determine Electric Field and Potential in an Infinitely Charged Plate?

    Homework Statement Infinite plate is charged with symmetrically due to its central plane x = 0. Volume charge density is equal to \rho = \rho(| x |). Determine the electric field E and potential \phi within the panel. Take that the potential vanishes at points of the central plane...
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