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. A

    Electrostatics - parallel plate capacitor

    Two parallel uniform charged circular conducting metal disks contains a charge of +Q and -Q on the inner surfaces, and little amounts of charge +q and -q on the outer surfaces. The detail is shown in the diagram. Each plate has a radius R and thickness t. The separation of the plates is d...
  2. Link

    Whats the sound that you hear from scratching a fork on a plate called

    The sound is generated not exclusively by fork on a plate, but from other things such as scratching your nails against paper or sliding chalk on the blackboard. They all make you feel like your heads going to blow up. What is this phenomenon called, and how can the uncomfortable feelings...
  3. A

    Parallel plate capacitor problem

    A parallel plate capacitor is formed using a material whose dielectric constant is 3,00 and whose dielectric strength is 2x10^{8} V/m. The capacitance is 0,25x10^{-6}F and the capacitor must withstand a potential difference maximum of 4000V. Find the minimum area of the plates of the capacitor...
  4. H

    The temperature distribution on metal plate is given by

    The temperature distribution on metal plate is given by... Homework Statement The temperature distribution on metal plate is given by T(x,y) = 100/x^2+y^2+1 Calculate the direction derivative in the direction of v= <1,1> at the coordinates (3,2) and at coordinate (3,2) in what...
  5. M

    What is the dielectric constant of the slab on a parallel plate capacitor ?

    Homework Statement When a certain air-filled parallel-plate ca- pacitor is connected across a battery, it ac- quires a charge (on each plate) of magnitude 214 μC. While the battery connection is maintained, a dielectric slab is inserted into the space between the capacitor plates and...
  6. S

    Capacitance of Non-parallel plate capacitor

    Hi, I am modeling a transducer with non-uniform electric field lines. It can be considered as a capacitor but with non-parallel plate configuration. I have modeled the electric field lines using the laplace equation satisfying the boundary conditions and considering the equipotential lines...
  7. T

    Center of Mass: Plate with hole

    Homework Statement A uniform circular plate of radius 14 cm has a circular hole of radius 2 cm cut out of it. The center of the plate is at the origin of the coordinate system and the center of the hole is located along the x-axis a distance 4 cm from the origin. What is the position of the...
  8. M

    Purcell Tricky Three Plate Capacitor Questions

    This is problem 3.8 from Purcell's E&M. Three conducting plates are placed parallel to one another. The outer plates are connected by a wire. The inner plate is isolated and carries a charge of 10 esu per cm^2. In what proportion must this charge divide itself into a surface charge on the top...
  9. D

    Dielectric Constant K & Plate Charge Density

    Let me know if the following reasoning is correct : If the surface charge density on the internal surface of one of the plates in a parallel plate capacitor is Sigma, which becomes Sigma/K, when a dielectric material is inserted between the plates with dielectric constant...
  10. T

    Parallel plate capacitor and insulating material

    Homework Statement A parallel-plate capacitor has plates of 10 cm^2 area separated by a 0.10mm layer of glass insulation with resistivity rho = 1.2x10^13 omega*m and dielectric constant k= 5.6. Because of the finite resistivity, current can leak through the insulation. How do I Show...
  11. L

    What Is the Moment of Inertia of a Square Plate About Its Diagonal?

    Homework Statement Calculate the moment of inertia of a straight homogenous plate with mass m shaped like a square where the axis of rotation goes through the diagonal of the plate. ^ |y | /|\ / | \ a -------|------> a \ | / x \|/...
  12. B

    Reynolds Number of a circular plate perpendicular to external flow

    Hello, I am trying to obtain how to find the Reynolds Number of a circular plate perpendicular to external flow. Thanks
  13. R

    What is the Angular Velocity of a Thin Plate at Time t?

    Homework Statement Consider a thin homogeneous plate with a principal momenta of inertia. I1 along the principal axis x1, I2 > I1 along the principal axis x2. I3 = I1 + I2. Let the origins of the xi x'i systems coincide and be located at the center of mass O about an axis inclined at an...
  14. C

    News Does Joe Barton Think Oil in Alaska Disproves Global Warming?

    Today in the Capitol a very strange confrontation broke out between Rep. Joe Barton of Texas (the ranking Republican on the House Energy & Commerce Committee), and Energy Secretary Stephen Chu...
  15. M

    Percentage of energy in a dielectric placed between a parallel plate conductor

    Homework Statement A dielectric of dielectric constant 3 fills three fourth of the space between the plates of a parallel plate capacitor. What percentage of the energy is stored in the dielectric? E(r) = 3, distance between plates = d, thickness (t) = (3/4) * d, C=capacitance of the...
  16. I

    Calculating of heat transmission loss (convection) in a thick glass plate

    Hi. Do anybody here know how much and how quick a 50-100mm thick tempered glass plate of size 500mm * 500mm fully heated up within its bulk mass to a temperature of 60 degrees celcius looses it heat energy/temperature over time when surrounded by standing ambient air (20 degrees celcius)...
  17. U

    Electrostatics and infinately charged plate question driving me nuts

    Homework Statement An electron is released from rest 2.0 cm from an infinite charged plane. It accelerates toward the plane and collides with a speed of 1.0x10^7m/s. What is the surface charge density of the plane?The answer is 2.52×10−7 C/m^2 ! Homework Equations v=d/t, d=0.5at^2...
  18. E

    Capacitance from a separated plate disk

    Homework Statement Ok, let's say that I have two plate disk, with an area of A and they are separated with a distance d apart from each other. I need to measure the half-life of exponential decay to calculate capacitance. I need to graph C vs x = 1/d, however how can I get C ?? Homework...
  19. U

    Why needs plate capacitor high voltage

    Hi, I tried to charche a plate capacitor with some 20 Volts but when disconnecting the cables from DC supply the voltage goes down to zero. Why is this? Cables too long? Didnt I wait enough or does a plate cap need high voltage (5000 Volts) and why does it? I am a theoretical physicist and have...
  20. N

    Rotational Inertia of Irregular Plate

    Homework Statement In Fig. 10-43a, an irregularly shaped plastic plate with uniform thickness and density (mass per unit volume) is to be rotated around an axle that is perpendicular to the plate face and through point O. The rotational inertia of the plate about that axle is measured with the...
  21. J

    Electric field across a parallel plate capacitor

    Hello, If I had a potential source (V) , a resistor R, and a parallel plate capacitor, would the Electric field across the capacitor become E = (V - IR)/L L = distance between capacitor or would the electric field simply become E = V/L ?? thank you!
  22. D

    Electric field of infinite plate

    2 infinite plates are placed one next to another in a V formation with an angle β between them, they have charge densities of σ1 and σ2. what is the magitude of the field betweein them. ϕ=\ointEdA=EA ϕ=\frac{q}{ϵ}=\frac{σA}{ϵ} E1=\frac{σ1}{ϵ} E2=\frac{σ2}{ϵ} E=E1+E2 lets make our...
  23. T

    Electron Deflection in Parallel Plate Capacitor

    Homework Statement A Problem of Practical interest is to make a beam of electrons turn a 90 degree corner. This can be done wit ha parallel plate capacitor shown. An electric with kinetic energy of 3.0x10^-17J moves up through a small holes in the bottom plate of capacitor. What is field...
  24. D

    Elecric Displacement in a plate capacitor

    There is a // plate capacitor with one plate charged (sigma) and the other charged (-sigma). Between the plates are 2 dielectrics each of thickness a. (This does not matter to my question). Why is the electric displacement equal to sigma? Every solution I find draws a gaussian surface around...
  25. P

    How Does Changing Plate Radius Affect Capacitance in a Parallel Plate Capacitor?

    Consider a parallel plate capacitor constructed from two circular metal plates of radius R. The plates are separated by a distance of 1.6mm a. What radius must the plates have if the capacitence is 2.8 micro F? b. if the separation between the plates is decreased, should the radius of the...
  26. L

    Shear Stress over Stationary Plate

    [b]1. A large plate moves with speed (v.o) over a stationary plate on a layer of oil of thickness (d) and viscosity (u). If the velocity profile is that of a parabola, with the oil at the plates having the same velocity as the plates, what is the shear stress on the moving plate from the oil...
  27. A

    Find the principal moments of inertia of a flat rectangular plate

    Hello everyone; here is the problem that I’m currently working on: =============================================== a- Find the principal moments of inertia of a flat rectangular plate (mass = 30g, a = 80 mm, b = 60 mm) that rotates about a diagonal with velocity ω = 15 rad/s. b- What are...
  28. J

    Uniaxial Plate Bending vs Beam Bending: What's the Difference?

    I would appreciate it if some one could help me with this. I read from Timoshenko's book Theory of Elasticity that for prismatical beam bending (uniaxial), the assumption is \sigma_x>>\sigma_z,\sigma_y=0 where \sigma_x is stress in the direction parallel to the deflection curve. And for...
  29. S

    Parallel Plate Capacitor Connected to Battery: Answers

    Homework Statement A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.) Give all correct answers concerning a parallel-plate capacitor charged by a...
  30. H

    What is the Charge and Error in a Parallel Plate Capacitor?

    A capacitor with capacitance of C = 8.5±1 μF has a potential difference of V = 4.5±0.4 Volts. What are the charge on the capacitor and the error in this value, in μC? To find charge I just use Q = C*V correct? And how do I calculate the error? Thank you!
  31. X

    J"Calculating Work for Charging a Parallel Plate Capacitor

    Homework Statement A parallel plate capacitor is changed to an electric potential of 334V by moving 3.78e16 electrons from one plate to the other. How much work is charging the capacitor? Homework Equations Delta V= Delta PE/ q c=q/v The Attempt at a Solution Delta V= Delta PE/ q...
  32. G

    I hope that helped.How to Find Energy Stored in a Parallel-Plate Capacitor?

    Homework Statement A parallel-plate capacitor has plates with an area of 410 cm^2 and an air-filled gap between the plates that is 2.00 mm thick. The capacitor is charged by a battery to 560 V and then is disconnected from the battery. a.How much energy is stored in the capacitor? b.The...
  33. J

    Is This Rectangular Plate BVP Correct?

    THe following exercise deal with the steady state distribution of the temperature in either 2-dimensional plates or 3-dimensional regions. Problem: A 10X20 rectangular plate with boundary conditions . at the lower side where there is poor insulation the normal derivative of the temperature is...
  34. J

    Boundary Value Problem , triangular plate

    This exercise deal with the temperature u(x,y,t) in a homogeneous and thin plate. We assume that the top and bottom of the plate are insulated and the material has diffusivity k. Write the BVP . Problem: The plate is triangular , picture this as a right triangle with this coordinates, (0,0) ...
  35. N

    How to Calculate Electric Energy in a Spherical Capacitor with Dielectric?

    Homework Statement I am doing a problem in my physics textbook where there is two concentric hollow spheres and the space between them is filled with a dielectric substance. The question asks for the electric energy in this space. Homework Equations The only given equation for the C of...
  36. B

    Thermal Expansion of a steel plate

    Homework Statement A steel plate has a circular hole with a diameter of 1.000 cm. In order to drop a Pyrex glass marble 1.003 cm in diameter through the hole in the plate, how much must the temperature of the system be raised? (Assume the plate and the marble always have the same temperature)...
  37. P

    Homogenization of a plate to an equivalent rod .

    Homogenization of a plate to an equivalent rod... Folks, I have a doubt... Sorry if it is a really stupid one...:rolleyes: Imagine you have a steel plate say 200mm by 200mm in dimension, with a stiffness of say some "k" N/mm... Is there any formula to convert that plate into an...
  38. H

    Electron and parallel plate question >

    electron and parallel plate question >:( Homework Statement The diagram below shows an electron entering the region between the parallel plates of a cathode ray tube. The electron has an initial velocity of 4.8x10^7 m/s horizontally and enters the exact middle point between the plates. The...
  39. wolram

    Pickle Plate - 6 Delicious Varieties

    One thing i enjoy is pickles, this is a dish i put together, Pickled red cabbage Pickled cauliflower Pickled cornichons Pickled onions (balsamic vinegar) Pickled chili's Pickled peppadews Served with strong cheese and crusty bread. A treat for the taste buds :approve:
  40. B

    Choking in a Circular Orifice Plate in a pipe

    The equation I have for velocity through a circular orifice plater is as follows: Ud = \frac{Yi\timesC}{\sqrt{(1-(d/D)^4)}}\sqrt{\frac{(2\times(P_{2}-P_{1})}{\rho}} To my understanding, flow becomes choked when this velocity exceeds a Mach number of 1, and is no longer sub-sonic...
  41. J

    Simple harmonic motion of sliding dinner plate

    Homework Statement A child with poor table manners is sliding his 240 g dinner plate back and forth in SHM with an amplitude of 0.110 m on a horizontal surface. At a point a distance 7.00×10−2 m away from equilibrium, the speed of the plate is 0.350 m/s 1.What is the period? 2.What...
  42. S

    Studying the force on a plate from an air jet

    Hi, I have been carrying out a lab experiment where I am studying the force on a plate from an air jet. I need to come up with a theoretical derivation of an equation for the force on the plate and I was wondering if anyone had any ideas about how to go about this? Thanks
  43. R

    Surface Tension: Exploring the Direction of Drag on a Circular Plate

    I have been studying surface tension from my textbook, when I came across a question in which a thin circular plate is placed over water. The surface tension of the water is given. The minimum force required to pull away the circular plate is asked. The dilemma, I am in is in which direction...
  44. F

    A positron moving from a Charged Plate to Another

    A positron moving from a Charged Plate to Another [SOLVED] Can you solve the question a and b and explain it to me ? What i know ? ( I'm not sure though ); Kinetic Work = Kinetic Energy = 1/2 m . v^2 Electrical Work = Electrical Energy = q.V So at the begin, the positron isn't moving...
  45. M

    Electric displacement in plate capacitor

    Suppose there's dielectric material in inside a parallel plate capacitor with plate charge densities ±σ. What's the electric displacement D? I've seen solutions that draw a Gaussian surface around one of the surfaces and argue that the enclosed charge is Aσ and the flux of D is Aσ therefore...
  46. I

    Horizontal plate fields physics

    Homework Statement Two sets of parallel plates can be used to accelerate and direct an electron. the first set of plates is arranged vertically. the distance separating these plates is 5.5 cm . the potential difference between these plates is 260V. the electron starts from rest on the left...
  47. S

    Conducting Sphere and Grounded Conducting Plate

    Homework Statement A conducting sphere of radius R carries a total charge of +Q. Its center is placed a distance 2R to the right of a grounded conducting plate. What is the potential at a general point in space outside the sphere and to the right of the plane? (Carry out to at least four...
  48. T

    Why do alpha particles cause neutrons to be released from beryllium?

    First of this is not an homework question but just a bit of a theory i am having a bit of difficulty understanding. Secundly, hello! James Chadwick discovered neutrons by sending alpha-particles from a radioactive source to a beryllium-plate, and that plate then sent out neutrons. I don't...
  49. T

    Magnetism, Displacement Currents and Parallel Plate Capacitors

    Homework Statement The preceding problem was an artificial model for the charging capacitor, designed to avoid complications associated with the current spreading out over the surface of the plates. For a more realistic model, imagine thin wires that connect to the centres of the plates (see...
  50. C

    Velocity of a particle in a parallel plate, electric field problem

    Homework Statement A particle with a mass of 2.0 x10^-5 kg and a charge of +2.0 microColoumbs is released in a (parallel plate) uniform horizontal electric field of 12 N/C a) HOw far horizontally does the particle travel in 5.0 s? b) What is the horizontal component of its velocity at...
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