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. Plat

    Calculate the thickness of a plate to withstand a specified uniform pressure

    In exploring the feasibility of constructing a vacuum chamber, I am trying to calculate the thickness of rectangular polycarbonate sheet needed to withstand 100kPa of pressure, given dimensions of 30.5cm by 61cm (12 by 24 inches) and clamped edges. I have found some calculators that will tell...
  2. D

    Find the center of mass of a plate

    Homework Statement Find the center of mass of the next plate if: A) Is homogeneous B) Its density per unit mass is ##\sigma=Axy##, where ##A## is a constant. Homework Equations ##X_{cm}=\frac{\int\sigma x dA}{\int\sigma dA}## ##Y_{cm}=\frac{\int\sigma y dA}{\int\sigma dA}## The Attempt at a...
  3. Vipanj

    I How can we visualise a half period zone inside a zone plate?

    how can we consider/ visualise a half period zone inside blackened portion of +ve zone plate ?
  4. Z

    The potential between a cone and a plate

    Homework Statement [/B] There is a conducting cone with angle α placed so that its vertex is normal to an electrically grounded plate, but electrically insulated from the plate and kept at a constant potential V. Find the potential V and the electric field in the region between the cone and the...
  5. BillTre

    How Can We Visualize the Earth's Plate Tectonics Over Time?

    Here is a website that shows the arrangement of the continents and seas at a range of past times (105-750 MYA). It was made by Ian Webster, a software engineer. This a lot like a similar but less good iPad app I used to have that was (like Ancient Earth) based on the work of Christopher...
  6. G

    How to treat the "ideal" plate capacitor more rigorously?

    Hi. The derivation of the capacity of an ideal parallel-plate capacitor is inconsistent: On the one hand, the plates are assumed to be infinitely large to exploit symmetries to compute an expression for the electric field, on the other the area is finite to get a finite expression for the...
  7. N

    Distance between a box fan and a perforated plate

    I have a question about the relationship between fan CFM vs the distance it is installed away from a perforated wall. I did a simulation and it shows that keeping a distance between the two will make the fans have more CFM, less static pressure than the fans directly installed on the plate. If...
  8. S

    Heat needed to expand a circular metal plate

    Homework Statement A circular metal plate of diameter D needs Q Joule of heat to expand and the temperature changes from 40oC to 58oC. What is the thermal energy needed to expand identical metal plate having twice the diameter for same increase in temperature? Homework Equations Q = mcΔT The...
  9. PainterGuy

    Electric field outside a parallel plate capacitor

    Hi! Could you please help me with the queries below? Thanks a lot. Question 1: My question is about the field outside the plates of parallel plate capacitor. It is said that the field(s) between positively and negatively charged plates gets added up but the field(s) outside the plates gets...
  10. L

    B What is the equivalent in kg of the force exerted on a plate

    Hello everyone, my question might seem stupid but I'm still wondering : what is the equivalent in kg of the force exerted on a plate when eating? (can't test this with a scale because I am not at home). Thank you for your kind answers
  11. BillTre

    Plate Tectonics: Origins and Implications

    Here is a NY Times article that seems to be based on this special issue of the Philosophical Transactions of the Royal Society A: Mathematical, Physical, and Engineering Science (which is open access for downloading pdf's!). Discussed are things like: when did plate tectonics start what...
  12. A

    Average force during a ball's elastic bounce off of a plate

    Homework Statement [/B]Homework Equations For this problem I have calculated the average force as ∫ Fdt/ ∫dt And using a(acceleration)=2h(height)/t2 and calculating the numerator it comes out -2m(mass)h/t ,but what will be the limit of the intergral in that case ?? Of course the...
  13. K

    Kinetic energy of Himalayan plate

    In this video (2:30 to 4:00) you can see the Indian continental plate zipping across the Indian Ocean and smashing into Eurasia, raising the Himalayas. Estimate its kinetic energy.
  14. papercace

    Electromagnetic field acting on a conducting infinite plate

    Homework Statement Consider an electromagnetic field in an empty space in the region ##0 \leq z \leq a## with the following non-zero components: $$E_x = -B_0\frac{\omega a}{\pi}\sin\left(\frac{\pi z}{a}\right)\sin\left( ky-\omega t\right)\\ B_z = B_0\frac{ka}{\pi}\sin\left(\frac{\pi...
  15. cookiemnstr510510

    Potential of parallel plate capacitor

    Homework Statement I have attached a problem from within the chapter of my book. I have a question regarding my highlighted part. My question: Is the reason they are saying E= -Q/(ε0A) because they defined the positive "s" axis to the right? and since E is pointing from right to left we say...
  16. isukatphysics69

    A plate carries a charge of -5.2 μC

    Homework Statement A plate carries a charge of -5.2 μC, while a rod carries a charge of +1.8 μC. How many electrons must be transferred from the plate to the rod so that both objects have the same charge? Homework Equations N/A The Attempt at a Solution So I am imagining a plate and a rod...
  17. F

    Plate capacitor connected to a battery (what does a battery do)

    I have a plate capacitor connected to a battery with a known potential difference. Now the plates are moved apart by dx and I must figure out the change in energy stored in the battery. Question 1: When a plate capacitor is connected to a battery charges must flow until the potential difference...
  18. C

    Natural Convection vertical heated flat plate

    1. I am using FEA modelling for a vertical heated flat plate and I need to compare theoretical results with the FEA s/w modelling results. I have completed the model in FEA s/w and I'm getting different values for temperatures and because I can't work out theoretical values then I do not know...
  19. Roy S Ramirez

    Adjusting the pressure drop in an injection plate

    Hello everybody, I'm designing a gas pressure feed system for a hydrogen peroxide - ethanol rocket engine, and after analyzing the devised injection plate, I noticed it is very sensitive to the propellants' pressure drops and discharge coefficients. Once the plate is manufactured, the only...
  20. P

    Electrical About a load calculation -- Roller selection for a plate straightining maching

    i am making a plate straightining maching for 25x2100 mm plate. motor- 30 hp and 960 rpm worm reduction gear box- 100:1 Please tell me about the selection of roller by which i can straight the plate, and gear also.. if center distance between gear is 280 mm
  21. M

    A thin steel plate is in the shape of a half circle

    Homework Statement The half thin steel plate has a radius of 4 meters and a surface density of (3+r) kg/m^2, where r is the radial distance from the origin. Using calculus, find: A. its area B. its mass C. Its center of mass with respect to the origin shown, D. It's rotational inertia about the...
  22. Krushnaraj Pandya

    Moment of inertia of a metal plate about three points

    Homework Statement Moment of inertia of a metal plate (center at origin) which was a square before 1/4th of it was cut off (4th quadrant), about three points a)- top leftmost corner in 2nd quadrant b)- origin and c) (where the right-lowest corner used to be in 4th quadrant) ranked in decreasing...
  23. R

    Calculating Work to Charge Parallel Conducting Plates

    Homework Statement A pair of parallel conducting plates, each measuring 30 cm X 30 cm, are separated by a gap of 1.0 mm. How much work must you do against the electric forces to charge these plates with ##+1.0 \cdot 10^{-6} C ## and ##-1.0 \cdot 10^{-6} C##, respectively? Physics for Engineers...
  24. platosuniverse

    B Why doesn't the plate interact with the particle in double slit?

    When particles are shot at the plate/screen in the double slit experiment, why doesn't the particles interact with the screen? Shouldn't the plate act as an observer and "collapse" the wave function into one or the other slit? Why does it take a measuring apparatus to know which slit the...
  25. S

    Stress intensity factor using Ansys APDL for a 3D plate

    I am trying to evaluate SIF for 3D plate using ansys APDL. Please share tutorial/notes if available.
  26. K

    I Determining Plate direction by having three point of it.

    Hi all, Can anyone help to solve this problem? Imagine a big plate suspended in the air through three threads with different length. we know length of each individual thread, and they are 120 degree apart from each other. How cam we calculate the tilt of the plate and direction of the tilt?
  27. S

    Potential due to a charged plate using the dipole approximation

    Homework Statement A plane z=0 is charged with density, changing periodically according to the law: σ = σ° sin(αx) sin (βy) where, σ°, α and β are constants. We have to find the potential of this system of charges. Homework EquationsThe Attempt at a Solution [/B] I...
  28. thevinciz

    Equilibrium of a stiff plate on inclined planes

    Homework Statement A thin stiff uniform rectangular plate with width L (L =AB) is lying on two inclined surface as shown in Fig. 3-1. The angle between the horizontal surface and the left inclined surface is α, and that between the horizontal surface and the right inclined surface is β. It is...
  29. K

    What is the Correct Way to Calculate Emissivity and Absorptivity?

    Homework Statement An impenetrable flat horizontal plate is radiated with 3000 W/m^2, where 500 W/m^2 is reflected. The surface temperature of the plate is 200 °C and it emits 500 W/m^2. Air with temperature 25 °C flows over the plate, and the heat transfer coefficient due to this is 20...
  30. M

    Statics problem -- Rectangular plate lying on two inclined surfaces

    Homework Statement https://www.img.in.th/image/VNaqVa https://www.img.in.th/image/VNa3k9 This is my home work. Homework EquationsThe Attempt at a Solution I have a problem with the force at A and B. I don't know how to use NA NB in the term of α and β to use moment calculation. I got that...
  31. F

    Find the charge on the positive circular plate

    Homework Statement Homework Equations Q = C ΔV C = ##\frac{ε A}{d}## The Attempt at a Solution A = π R2 Q = (π R2*ε V)/d Is my answer correct ?
  32. K

    Pressure on a vertical rectangular plate submerged in water

    The question goes as follows..: A car driver has an accident and drives into a lake. The car sinks to the bottom. The distance from the car door to the water surface is 10m. The car door is 0.9m wide and 1.3m tall. Assume that the car door can be approximated as a vertical rectangular plate and...
  33. S

    What types of stresses are present on the bolted plate in this project?

    My partner and I are arguing over what types of stresses are present on a point of our project. We must calculate the stress by hand using Von Mises eq uations. The picture shows a diagram of what's going on. We are calculating the stress on the mounting plate from the quarter of the motors...
  34. Gyro de Pyro

    Magnetic plate eddy current braking effect on a copper disc

    Hi, I've seen many videos of neodymium magnets sliding slowly down an inclined copper plate, or slowly down a copper tube - due to eddy current braking,but never the other way around. My question is; will a copper disc sliding down an inclined magnetic plate, or down a magnetic tube act in the...
  35. Sunanda

    What is the potential of plate B with respect to infinity?

    I have two isolated plates A and B, kept parallel to each other. Now I give charge +Q to the plate A, it will redistribute itself as +Q/2 on the outer plate A and + Q/2 on the inner plate A. Right? Now this will induce charge -Q/2 on the inner plate B and +Q/2 charge on the outer plate B...
  36. Rodrigo

    ANSYS APDL 18.2 - Symmetric Stiffened Plate

    Hello, I'm a new ANSYS user and could someone give me some help about this tutorial: https://confluence.cornell.edu/display/SIMULATION/ANSYS+-+Semi-monocoque+shell+-+Problem+Specification I'm trying to replicate it but can't get the same answear in the end. Any advice about what i could do...
  37. Ekaekto

    Breakage resistance of a Polycarbonate plate with flowed through drill hole

    Hi everyone, I was wondering how to best calculate the breakage resistance of a drill hole which is being flowed through with a certain volumetric throughput within a polycarbonate (PC) rectangular plate. Well basically, the breakage resistance of the PC around the drill hole :) The plate is...
  38. V

    Vector potential of a plate with a uniform, time-harmonic current density

    Hi all, i tried to do this question but got stuck on the last point . Can anyone help me please? The general form of vector potential: I got the answer for A1 vector potential but don't know what assumptions i need to get the expression for the A2. Does anyone know how one can derive it...
  39. A

    How charge density of plate is changed by permittivity

    Homework Statement Distance between plates of a parallel-plate vacuum capacitor is d. The capacitor is attached to a battery that keeps it at a voltage V. The space between plates is now filled dielectric relative permittivity epsilon. How will charge density of the plates change? Homework...
  40. Apple

    A baseball is thrown from the outfield toward the home plate

    1. The problem statement, all variables, and given/known data A baseball is thrown from the outfield toward the home plate. a) Neglecting air resistance, is the momentum of the ball conserved during its flight? explain b) Neglecting the air resistance, is the momentum of the earth-ball system...
  41. C

    Finding the angle of an electron striking a plate

    Homework Statement An electron is fired at 4.0 x 106 m/s horizontally between the parallel plates, as shown, starting at the negative plate. The electron deflects downwards and strikes the bottom plate. The magnitude of the electric field between the plates is 4.0 x 102 N/C. The separation of...
  42. M

    I Conformal Mapping Wedge to Plate

    Hi PF! Does anyone know the conformal map that takes a wedge of some interior angle ##\alpha## into a half plane? I'm not talking about the potential flow, just the mapping for the shape. Thanks!
  43. radiant_june

    Parallel plate electric fields -- # of electrons transferred

    Homework Statement An oil droplet is suspended between two horizontal parallel plates with a separation of 0.4 cm. If the potential difference of 320V is applied to the plates, determine the number of electrons transferred to/from the droplet. Given/Known Values mdroplet = 5.2×10-6 kg d = 0.4...
  44. L

    Ions passing through a parallel plate capacitor with a varying voltage

    Consider the scenario Two parallel plates One ion particle (mass 1, charge +1) traveling parallel to the plates through the middle. Voltage of the plates is the same. As the ion travels between the plates the voltage on the plates ramps up, and the electric field between the plates remains...
  45. T

    Electrostatic force between a Half Cylinder and a Plate

    Homework Statement (This is not a HW problem, but HW-type problem.) A half cylinder of radius R and length L>>R is formed by cutting a cylindrical pipe made of an insulating material along a plane containing its axis. The rectangular base of the half cylinder is closed by a dielectric plate of...
  46. P

    Disconnected vs Connected parallel plate capacitor

    I am having a hard time understanding the whole idea behind and the difference between disconnected vs connected parallel plate capacitor in terms of voltage and charge. How does this relate to the formula C(Q/V)=ke0A/d?
  47. F

    Is Plate Capacitor Gap a "Non-linear" Medium?

    Could the space (air gap) between two DC charged parallel plates be considered to be a "non-linear" medium with respect to an EMF radiated by a coil contained within that space?
  48. V

    Dielectric inserted into a parallel plate capacitor

    Homework Statement The capacitor (of thickness d) is disconnected from a potential source of V and a dielectric of thickness t is inserted and it has relative permitivity Er. Find the new potential between the plates Homework Equations [/B] This is the answer : Vf = V/d(d - t + t/Er) The...
  49. J

    How is a plate with a hole in it sealed

    Say I have a simple 2 or 3mm thick sheet of plexiglass or aluminum, and I have a closed chamber box out of these sheets. Now, I want to build a pressure inside the chamber, but the prototype only has a simple O shaped "hole" on the box. I can choose the diameter of the hole, and I have a rubber...
  50. V

    A mass is dropped on a plate that's suspended from a spring

    Homework Statement a load of mass m falls a height h onto a pan hung from a spring. if the spring constant is k and the pan is massless and m does not bounce, the amplitude of oscillation is Homework Equations F = - kx U = 1/2kx^2 The Attempt at a Solution mgh = 1/2kx^2, x =...
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