Plates Definition and 622 Threads

According to Latter Day Saint belief, the golden plates (also called the gold plates or in some 19th-century literature, the golden bible) are the source from which Joseph Smith translated the Book of Mormon, a sacred text of the faith. Some witnesses described the plates as weighing from 30 to 60 pounds (14 to 27 kg), gold in color, and composed of thin metallic pages engraved with hieroglyphics on both sides and bound with three D-shaped rings.Smith said that he found the plates on September 22, 1823, on a hill near his home in Manchester, New York, after the angel Moroni directed him to a buried stone box. He said that the angel prevented him from taking the plates but instructed him to return to the same location in a year. He returned to that site every year, but it was not until September 1827 that he recovered the plates on his fourth annual attempt to retrieve them. He returned home with a heavy object wrapped in a frock, which he then put in a box. He allowed others to heft the box but said that the angel had forbidden him to show the plates to anyone until they had been translated from their original "reformed Egyptian" language.
Smith dictated the text of the plates while a scribe wrote down the words which would later become the Book of Mormon. Eyewitnesses to the process said Smith translated the plates, not by looking directly at them, but by looking through a transparent seer stone in the bottom of his hat. Smith published the first edition of the translation in March of 1830 as the Book of Mormon, with a print run of 5,000 copies at a production cost of $3,000 (or 60 cents per book).
Smith eventually obtained testimonies from 11 men who said that they had seen the plates, known as the Book of Mormon witnesses. After the translation was complete, Smith said that he returned the plates to the angel Moroni; thus they could never be examined. Latter Day Saints believe the account of the golden plates as a matter of faith, and critics often assert that either Smith manufactured them himself or that the Book of Mormon witnesses based their testimony on visions rather than physical experience.

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  1. T

    Electron Force Between Parallel Plates

    Homework Statement [PLAIN]http://img214.imageshack.us/img214/6328/physics2.jpg An electron enters the lower left side of a parallel plate capacitor and exists precisely at the upper right side (just clearing the the upper plate). The initial velocity of the electron is 7x10^6 m/s parallel to...
  2. P

    Force between plates in condensator

    Homework Statement hello, how can i calculate force which work between two plates in condensator? I tried to write this in this way...
  3. A

    Confusion with parallel plates

    Hi, I was wondering if someone could help me understand how the potential of a parallel plate capacitor can be altered. I understand that the potential difference across two plates is equal to the potential of the battery that charges them, but can this potential be altered by changing the plate...
  4. N

    Calculating Final Velocities for Identical Plates on Ice

    Homework Statement Identical plates are placed close together on ice. A 0.742 kg rabbit that is initially sitting on the plate on the left jumps to the other plate and immediately back to the original plate. The rabbit leaves both plates with a horizontal component of velocity of magnitude...
  5. P

    Charge density - parallel plates

    Homework Statement 5. Two large, parallel conducting plates carrying opposite charges of equal magnitude are separated by 2.20 cm. a) If the surface charge density for each plate has a magnitude of 47.0 nCm^-2, what is the magnitude of the electric field intensity in the region between the...
  6. G

    Simple capacitor with two plates

    Hello, I can`t understand the following: Let`s say that we have a simple capacitor with two plates and air between them. And this capacitor is in a series circuit with a switch, voltage source and a resistor. Also, the capacitor is discharged and the switch is open. The voltage source is...
  7. M

    Charge distribution of two plates with different charges?

    If there are two plates with +2Q and -Q, what is the charge distribution on the four faces? I would assert this is the only solution S1--------------------------- (+0.5Q) S2--------------------------- (+1.5Q) (space) S3--------------------------- (-1.5Q)...
  8. A

    An electron in a trajectory motion between the center of two plates

    Homework Statement An electron with an initial velocity of 5.6x107 m/s in the x-direction moves along a trajectory that takes it directly between the center of two 20 cm x 20 cm plates separated by 1 cm. The plates are connected to a high voltage power supply so that the potential difference...
  9. M

    2 infinite plates, heat transfer question

    how would you find the gap size between 2 infinite plates given that the fluid is water and the plates are silicon? the temp of water is 20 C and I am assuming that the heat transfer coefficient is 390 W/m^2K. i remember doing this stuff in heat transfer with temperature profiles and stuff but...
  10. B

    Determining the Charge on Parallel Plates

    Homework Statement An electron starts from one plate of a charged closely spaced (vertical) parallel plate arrangement with a velocity of 1.63x104 m/s to the right. Its speed on reaching the other plate, 2.10 cm away, is 4.15x104 m/s. ... If the plates are square with an edge length of 25.4...
  11. AlexChandler

    Electric Field between two large oppositely charged metal plates

    Homework Statement I am trying to calculate the electric field between these two plates... and I am using two different methods to do so. One gives me the correct solution, and the other does not. I am curious as to why the second method is wrong. Homework Equations Gauss's Law Phi =...
  12. S

    Electic field / capacitance of parallel plates

    Upon calculating the electric field for a plate of charge, you arrive at: E = Q/Ae (Q the charge on the plate, A the area of the plate, e the permittivity of the dielectic) But then, isn't the total electric field between the plates twice this because of the equal but opposite charge on the...
  13. C

    Why is there a need to average the electric field between capacitor plates?

    As I have understood it, it is a classical problem to show that the force between to capacitorplates is \frac{1}{2}\epsilon _0 E^2 A, which is at first counterintuitive since one should think that it is QE = \epsilon_0 E^2 A. I am pondering that question a bit now and i saw the MIT lecture...
  14. A

    Calculating Charge Density on Parallel Plates | Homework Problem

    Homework Statement Two very large parallel plates are oppositely and uniformly charged. The field between the plates is 1.3×10^6 N/C. How dense is the charge on each plate ( in microC / m^2 ) Homework Equations The Attempt at a Solution
  15. S

    Natural-Free Convection between Vertical Plates

    Hello, Do you have any idea where I could find my formula for the Grashof N°, Nu and Heat? Thank you very much for your help Steve
  16. G

    An electron is shot between plates

    Homework Statement In the figure, a uniform, upward-pointing electric field E of magnitude 2.00×103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d = 2.00 cm. Electrons...
  17. V

    Polarization by quarter-wave plates

    Can anyone direct me to manufacturers/suppliers of the complete setup for the Polarization by Quarter-wave Plates Experiment? I have already found one: PHYWE Systeme (Germany) - http://www.phywe.com/461/pid/26331/Polarisation-durch-Lambda-Viertel-Plaettchen-.htm" , but I need at least two more.
  18. J

    Electron moving between 2 charged plates

    Homework Statement at some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.20 105 m/s and vy = 3.70 103 m/s. Suppose that the electric field between the plates is given by Evec = (120 N/C) jhat. (a) What is the electron's acceleration...
  19. Y

    Charged particle between two conducting plates

    Homework Statement Two large conducting plates are separated by a distance 'L', and are connected together by a wire. A point charge 'q' is placed a distance 'x' from one of the plates. Show that the proportion of the charge induced on each plate is 'x/L' and '(L-x)/L'. (Hint: pretend the...
  20. F

    Force & Viscosity between two parallel plates

    Homework Statement A flat circular disc of radius 1.0m is rotated at an angular velocity of 0.65 rad/sec over a fixed flat surface. An oil film separates the disk and the surface. If the viscosity of the oil is 16 times that of water (20 degree C) and the space between the disk and the fixed...
  21. D

    Parallel Plates and Potential Difference

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  22. K

    How to Solve for the Electric Field Between Angular Plates?

    the electric field between two plates . plates have an angle with each other. first plate has zero potential and the second plate has a V potential. i guess i must use laplace equation on cylndric coordinates but i couldn't find the answer. http://img85.imageshack.us/i/adsztw.jpg/
  23. R

    Electric field between two plates

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  24. T

    Electric field between two plates

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  25. A

    Force that holds capacitor plates

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  26. S

    Charge Distribution on Metallic Plates

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  27. B

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  28. R

    Angular Velocity of weighted plates

    Homework Statement A 7kg plate with a radius of 1.4m is rotating at 63 rad/s around an axis perpendicular to its center. Another plate that is not rotating is dropped onto the first plate and their centers align. The second plate is 5kg, with a radius of .8m. What is the angular velocity of...
  29. S

    Calculating charge outside capacitor plates

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  30. F

    Work required to move capacitor plates

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  31. M

    Velocity profile between parallel plates with velocity dependent force

    Homework Statement I have a channel of height H (y-direction) with three different layers. A bottom layer of height L where only viscous forces play a role and the lower boundary is a stationary plate, a middle layer of height L (so from L to 2L) where a force F depending linearly on the fluid...
  32. M

    Electron shot between two charged plates, does it hit?

    Homework Statement A uniform, upward electric field E of magnitude 2.00x10^3 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 10.0 cm and separation d = 2.00 cm. An electron is then shot...
  33. J

    Determine the separation between the plates

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  34. I

    Number of different license plates

    My book says that if a license plate must have 3 letters, and 4 numbers, when repetition is allowed, and no restriction is placed on the order of letters and numbers, then the amount of possible license plates is: \begin{pmatrix}7 \\3\end{pmatrix}10^{4}26^{3} \begin{pmatrix}7 \\3\end{pmatrix}...
  35. F

    Oppositely charged parallel plates I don't get why

    "the sum of the force from the top plate and the force from the bottom plate always equals the same amount"...as shown here: http://www.regentsprep.org/Regents/physics/phys03/aparplate/ I mean, if a charge was placed at different places (ie distances) between 2 point charges, the net force...
  36. Y

    Charge placed between two plates

    Homework Statement A sheet of charge +Q is in between two large plates of a capacitor. The plates are separated by a distance 'S', and are connected to each other by a wire. The sheet of charge is closer to one plate, at a distance 'a' from it. Show that the ratio to +Q of the charges...
  37. G

    Hey asume i have conected up parallel plates but of different areas

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  38. S

    Force required to separate two plates apart

    If two plates of area A and separation d contain liquid in between with angle of contact 0 degrees, then what is the amount of force required to pull the two plates apart? How do we derive this??
  39. H

    Implementing Curved Fresnel Zone Plates: Analysis and Efficiency

    Hi there, I'm wondering if anyone has any analysis or sources to help me understand how a Fresnel zone plate can be implemented on a curved surface, and the corresponding diffractive efficiency and focal length?? Thanks!
  40. S

    Electric Field between two metal plates

    Homework Statement Two square metal plates are placed parallel to each other, separated by a distance d= 2.34 cm. The plates have sides of length L= 0.750 m. One of the plates has charge Q=+ 2.70 x10-3 Coulombs, while the other plate has charge -Q. What is the magnitude of the electric field...
  41. J

    Charge that a battery transfers between two plates

    Homework Statement An AA battery (1.5 V potential) is connected to a parallel-plate capacitor having 6.00cm-diameter plates spaced 4mm apart. How much charge does the battery move from one plate to the other? Homework Equations V=Q/C C=A\kappa\epsilon/dThe Attempt at a Solution Plugged in...
  42. W

    Understanding the E-Field Between Parallel Plates

    I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. I posted in 'Classical physics' with no luck. Maybe someone can help me here? It gives the situation of a conducting plate with charge density sigma 1 on...
  43. K

    Induced charge on plates of capacitor

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  44. K

    Electric Field due to Capacitor Plates

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  45. W

    Why Is the Electric Field Between Parallel Plates Not What I Expected?

    I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. It gives the situation of a conducting plate with charge density sigma 1 on each side. The E field on each side due to the conducting plate is = sigma...
  46. L

    A pair of oppositely charged, parallel plates are separated

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  47. P

    Electric Field of Two Charged Plates

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  48. K

    Work performed on a proton between two charged plates

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  49. M

    Finding potential between plates

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  50. J

    Find the charge on the plates a long time after the switch is closed

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