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. T

    Calculating net torque on a plate

    Homework Statement I'm supposed to be finding the net torque on a square plate. The sides are 1.7 m in length, with a force acting on each corner (30 N top left pointed right, 60 N top right pointed down, 20 N bottom left pointed up, and 40 N bottom right at an angle of 37 degrees). Just for...
  2. L

    What is the direction of friction on a plate on two rotating wheels?

    Homework Statement A uniform plate of mass M stays horizontally and symmetrically on two wheels rotating in opposite directions. The separation between the wheels is L. The friction coefficient between each wheel and the plate is N. Find the time period of oscillation of the plate if it is...
  3. X

    Energy stored in parallel plate capacitor

    Can anyone please tell me whether I have solved this question correctly or not. 1. Homework Statement A parallel plate capacitor has a charge of 0.040µC on each plate with a potential difference of 240 V. The parallel plates are separated by 0.20 mm of air. What energy is stored in this...
  4. K

    Inf. Parallel Plate Capacitors and Potential Energy

    Hopefully no one minds that I post a couple questions in a row as long as I'm following the rules: 1. Homework Statement Two infinite parallel plates labelled W and X are separated by 5.2 cm. The electric potential between the plates is 150 V. An electron starts from rest at time tW and...
  5. T

    Calculating Deflection & Mode Shape in 3-Segment Plate

    When buckling plate of both ends fixed, the deflection and the mode shape of the plate can be found from the equation: y=M(1-cos mx)/P. With this equation, the cross sectional area and the young's modulus of the plate is usually unchange. However, if the flexural rigidity of the plate is divided...
  6. deedsy

    Magnetic Field inside plate

    Homework Statement What is the magnetic field outside and inside of a large, flat conducting plate if the current density decreases linearly with depth z inside the plate. J = J0(1-az). The plate thickness is 1/a. Homework Equations *see below The Attempt at a Solution \oint \vec B \cdot d...
  7. S

    How to calculate natural frequency of a circular plate

    I am trying to get used to using a Data Physics analyzer at work in order to measure the natural frequency of components of a larger project I am involved in, my method described is intentionally crude as I was trying to do this as a quick play around before diving into the real thing.. To...
  8. B

    Vertical movement of heating plate

    I wish to give a vertical movement to a heating plate. How can I do it?
  9. A

    Creating pressure with hot plate

    I'm looking for a way to create pressure something similar to a teapot becoming heated and expelling vapor pressure. I want to find a way make a pipe or something to create a force so The pressure can push a fan hooked up to an alternator that will then store energy in big battery(maybe car...
  10. S

    Impact speed of an electron in a parallel plate capacitor

    Homework Statement The electric field strength is 2.50×104 N/C inside a parallel-plate capacitor with a 1.20 mm spacing. An electron is released from rest at the negative plate. What is the electron's speed when it reaches the positive plate? Homework Equations F = eE = ma vf2 = vi2 + 2ad...
  11. y2j

    Plate fin tube heat exchanger design procedure

    Hi anyone have the procedure to design the plate fin tube heat exchanger (air cooler) at defined mass flow rates and inlet / outlet temperatures , or anyone have an software package can be used for this purpose , please can share it with me
  12. N

    Capacitance of an asymmetrical parallel plate capacitor

    I've been looking all over and to my great surprise have not be able to find an answer to this question. What is the capacitance between to parallel plates if one plate is larger than the other? For example, the capacitance between a 1" diameter plate and a 4" diameter plate. Thanks.
  13. K

    Inserting metal to parallel plate capacitor

    If there is a parallel plate capacitor with plate area, A, plate separation, d, and a slab of copper of thickness, b, is inserted exactly halfway between the plates. How to find it's new capacitance, C', and new potential difference, V' ? Answer: V' = E(d-b) and C' = εA / (d-b) I...
  14. Planetx

    Can a 50 Caliber Bullet Penetrate a Pure Diamond Plate from 50 Yards Away?

    How thin would a pure diamond plate have to be cut for a bullet to penetrate or fracture the plate if shot from a 50 yard distance? (assuming it is a spot on shot and the plate is octagonal and 15 cm across, and the bullet being a standard 50 caliber round.)
  15. A

    Physics investigation guidance: Vibration of circular plate

    Hi, I have previously made a post in order to gain some insight in my rather out of control project. Long story short I am investigating vibration of a circular plate and its standing waves. After consultation at this forum I have been guided in the direction of acoustics and bessel functions...
  16. D

    Dimensions of Parallel Plate Capacitors

    Homework Statement The electric field between two circular plates of a capacitor is changing at a rate of 1.5 x 10^6 V/m per second. If the displacement current at this instant is Id = 0.80 x 10^-8A, find the dimensions of the plate. Homework Equations Id = ΔQ/Δt = ε0(ΔΦE/Δt) ΦE = EA Q = CV...
  17. H

    Conservation of Momentum of a plate

    Homework Statement A plate drops onto a smooth floor and shatters into three pieces of equal mass. Two of the pieces go off with equal speeds v at right angles to one another. 1. Find the speed of the third piece. 2. Find the direction of the third piece. Assume the motion of the two pieces...
  18. A

    Three plate capacitor and charge distribution

    In the figure given the capacitance for the two pair would be same. Can anybody please explain me how the charge would be distributed across each plate? I think that the middle plate being isolated should have +Q on one side and -Q on other, but how would be the charge distribution about the...
  19. W

    Movement of particles on vibrating plate

    So our professor showed us wave patterns on a vibrating plate, by sprinkling powder over it. I'm curious as to why it behaved as it did.The powder moved to nodes, but I'm not sure why. I think it just gets bounced around until it lands on a node, which is stationary, so it then stays there. Is...
  20. C

    MHB How many license plate combinations can be made using letters and numbers?

    I am unsure about which/what formulas to use for these word problems.. Here is one: How many different 7-place license plates are possible if the first 2 places are for letters 26 letters) and the other 5 places are for numbers (0-9, 10 numbers in total)? Any guidance/help would be greatly...
  21. D

    Gravitational field owing to a uniform circular plate

    √Homework Statement Show that the gravitational field due to thin uniform circular plate of radius a at point distant R from center and on the axis passing through the center and perpendicular to the plane of the plate is given by E= -2πGρ[1-R/(a^2+R^2)^1/2] Homework Equations F= GMm/r^2...
  22. Fantini

    MHB Moment of Inertia of a plate with respect to one diagonal

    The problem is to show that the moment of inertia of a rectangular plate of mass $m$ and sides $2a$ and $2b$ about the diagonal is $\displaystyle \frac{2}{3} \frac{m a^2 b^2}{a^2+b^2}.$ I did it using the traditional definition of moment of inertia, that is, $$I = \int r^2 \, dm.$$ However, the...
  23. R

    How to find thickness of steel plate

    I have a 300 mm diameter hole in the ground surrounded by concrete. This hole will be covered by a steel plate. I need to get a machine of weight 2.5 tonnes across this hole safely without any bending of the steel plate. How would i calculate the required thickness of the plate? Thank you Ron.
  24. EinsteinKreuz

    Vacuum Tube & Thyratron plate capacitance

    What factors determine the anode plate-to-grid capacitance? I know that the capacitance of a regular capacitor is determined by the surface area of the plates and is inversely proportional to the distance between them. Does this hold for vacuum tube grids and anode plates? The reason I'm asking...
  25. U

    Pressure gradient across flat plate with flow is zero?

    So I learned recently that pressure gradient in the flow direction for flow over a flat plate is zero. However I don't understand this, because there has to be something that sets the flow in motion in the first place, and for fluids this has to be a pressure gradient. Could someone explain why...
  26. AdityaDev

    Doubt in parallel plate capacitor

    I was going through the capacitor lesson in my textbook. In it its written "...both positive and negative plates will produce electric field in the same direction, hence the electric field adds up...outside the plates, electric field is zero since the field due to negative and positive charges...
  27. P

    Length of a plate after roll forging?

    Hello, I'm new here. so I hope I posted this question in the right section. For this problem, I have to compute a couple of parameters: An Aluminum plate (7075-O) (length 10 [m], thickness 10 [mm], width 40 [cm]) is reduced in thickness from 10 to 9,5 [mm]. The radius of the rolls is 25 [cm]...
  28. T

    Calculating Force for Punching a Hole in a Plate

    Homework Statement What force is required to punch a 20-mm-diameter hole in a plate that is 25 mm thick? The shear strength is 350 MN/m2. Homework Equations σ = V / A The Attempt at a Solution The first thing I did was rearrange the formula to isolate for V. I got the area which (A=πr2) gave...
  29. H

    Why is Electric Field Constant between a Parallel Plate Capacitor?

    So electric field tells us the force per unit charge that is felt by a test charge at a distance d from a source charge. So it tells us that the closer the test, or other charge, is to the source charge ,the stronger the interaction, and also that the larger the source charge, the stronger the...
  30. neeraj kaira

    Decelerating Electrons & Releasing Energy: Reflector Plate Grid Dynamics

    When the beam of electrons reflect back to the grid due to the repeller voltage in reflector plate ,how the grid decelerates the returning electrons ?? And how they release their energy to the grid ?
  31. Y

    Using Method of Imaging for two point charges between Parallel Plate Capacitors

    Homework Statement Use either image charge method of separation of variables to solve: The distance between two large, grounded parallel conducting plates is 4x. Between them, two point charges +Q and -Q are inserted and have a distance x and 3x from one of the plates. (A line connecting the...
  32. S

    Calculate Potential Energy of Electron at a Parallel Plate Capacitor

    Homework Statement An electron with a speed of 5.0x10^6 m/s is injected into a parallel plate apparatus, in a vacuum, through a hole in the positive plate. The electron collides with the negative plate at 1.0x10^6 m/s. What is the potential difference between the plates? Vi= 5.0x10^6...
  33. A

    Electric charge in parallel plate capacitor with 2 parallel dielectrics

    Homework Statement My question is: If we have a parallel plate capacitor with 2 parallel dielectrics both taking A/2 of the complete surface, is the total electric charge equal to sum of the electrical charges in the first dielectric and the second dielectric, i.e is qtotal=q1+q2=σ1*A/2+σ2*A/2...
  34. Chestermiller

    Why Would Someone Choose PV NRT for a License Plate?

    My wife an I went out to dinner today, and we saw this Delaware license plate on a car in the restaurant parking lot: PV NRT How nerdy can a person get? What a gas! Chet
  35. L

    Integration: force on submerged triangular plate

    Homework Statement Submerged (vertically) right triangle 12x9x15(hypotenuse) with 12 m leg parallel to water surface. Top of triangle is 3m below surface. Find force on triangle.[/B]Homework Equations I know mass of water is 840 k/m3. I think I should also multiply times 9.8 for gravity...
  36. K

    Longitudinal waves in a quartz plate

    Homework Statement In a quartz longitudinal waves produce peaks on the 2 sides of the plate. the base frequency is: ##f_1=\frac{2.87E5}{s}## Where s is the thickness. calculate Young's modulus of quartz. \rho=specific mass=2.66[gr/cm3] Homework Equations \lambda=wavelength, u=velocity...
  37. J

    When does the plate of glass loosen from a glass cylinder in water?

    Homework Statement A thin glass plate is pressed at the end of a glass cylinder. The glass cylinder with the glass plate at the bottom is dipped in water so that the plate is 25 cm under the water surface (The glass cylinder i open, meaning only the bottom part is closed, due to the glass...
  38. E

    Total force on surface of a plate?

    Homework Statement http://scienceofdoom.files.wordpress.com/2010/12/convection-basics-1b.png How do I find the total force on that surface of the plate? Homework Equations T = μ * u'(y) where T is the shear stress, μ is a scalar constant - the viscosity and u'(y) is the velocity gradient...
  39. A

    Can Connecting Positive Plate of C1 to Negative Plate of C2 Cause an Explosion?

    Homework Statement Q1= 200 C Q2=400 CHomework Equations Qtotal= Q1+Q2 ? The Attempt at a Solution Qtotal=Q1+Q2=400-200=200 C Is it possible to connect the positive plate of C1 to the negative plate of C2 and vice versa without the capacitor getting explode ?
  40. J

    Parallel plate conductors of opposing charge and unequal magnitude

    A question has occurred to me during preparation for a Physics exam. My textbook does a good job of discussing a capacitor charged equal but opposite. But I want to take it a step further. My question is how to calculate the E field between 2 plates of opposing charge that have unequal...
  41. C

    Parallel plate capacitor problem

    Homework Statement A parallel plate capacitor is constructed with plates of area .0280 m^2 and separation .550mm Find the charge on each plate when potential difference between plates is 20.1V. what separation would be necessary to give a charge of 20 nC on each plate?Homework Equations Im...
  42. H

    Vectors and determining plate thickness

    Hi, I have two 1.5 lifting lugs supported in the roof of a concrete tunnel 3.5m apart at a height of 7m. The lugs require load testing and as per AS4991 require load testing to double the W.L.L therefore 3 tonne. My work has a 5 tonne RUD lug readily available therefore was thinking...
  43. loops496

    Electric field of a circular plate with non uniform charge density.

    Hey! I need to calculate the electric field on the axis of a circular plate of radius a with the following charge distribution: \sigma_0 \frac{r^2}{a^2} \delta (z), \; r\leq a0, \; r>a where \sigma_0 is a constant. I've already calculated the potential and taken its gradient to get the...
  44. A

    Calculating the natural frequency of a plate fixed at four corners

    How do I calculate the natural frequency of vibration of a rectangular plate of Al-6061, having dimensions 100 x 80 mm? The plate is fixed at four corners. Thank You
  45. ShayanJ

    Parallel plate capacitor with layers of dielectrics in between

    Consider a parallel plate capacitor with layers of dielectric between its plates somehow that the interfaces between them are parallel to the plates of the capacitor. If the surface charge density on the plates of the capacitors be \sigma , gauss's law gives D=\sigma which is the same inside...
  46. J

    How much will a steel plate bend?

    Hello, I am trying to figure out how to determine how much a simple steel plate will bend with "x" amount of weight on it. I have searched the internet looking for some good descriptive information for my studies and am having a hard time figuring it out. I understand that it is probably...
  47. E

    Shear deformation higher order plate theroies - variational consistent

    What is the meaning of... 1. Governing differential equations obtained are consistent with the assumed displacement field (If for a particular theory, governing differential equations are derived using variational approach). 2. Obtained boundary conditions are consistent with the governing...
  48. G

    Polarized Slab between Parallel Plate Electrode

    Homework Statement Find the electric field everywhere for the following permanently polarized structures which do not support any free charge: (b) Permanently polarized slab P_0 i_x of thickness b placed between parallel plate electrodes in free space at potential difference V_0...
  49. L

    Flat Plate External Free Convection Problem

    I am trying to calculate heat transfer from an inclined flat plate under free convection conditions. I am referring to Fundamentals of heat and mass transfer (Incropera / DeWitt). The equations and a spreadsheet which can be used to find a solution can be found at...
  50. E

    How can I calculate the force between finite coil and metal plate?

    Hi, I would like to calculate the force between a finite coil and a nearby metal plate. A pulsed current is supposed to flow into the magnetic coil, which will generate a magnetic field near the coil. Due to this magnetic field, an Eddy current will be produced in a nearby metal plate and...
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