Plate Definition and 1000 Threads

rectangular plate bending... I am designing an endplate for a spinal disc implant as shown in the image below. http://img155.imageshack.us/my.php?i...ndplatenb5.jpg" I need to determine a suitable thickness of plate h. I thought about looking into winkler foundations to begin with but i...

[SOLVED] Capacitor problem Problem: A parallel plate capacitor with adjustible plate separation d and adjustible area A 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...

Homework Statement A capacitor has square plates, each of side a, making an angle theta with each other. Shown that for small theta the capacitance is given by: C = [(epsilon)(a^2)/d][1-(a(theta)/2d]. Homework Equations C = q/V gauss' law The Attempt at a Solution I see how you...

Hi Everyone, I am having a problem finding the shear stresses in an annular plate. The problem is as follows. I have an annular plate with outer radius a, inner radius b. Outer and inner edges are fixed. I also have an annular line load at radius r. I am trying to calculate the shear...

[SOLVED]Dielectric help Homework Statement To make a parallel plate capacitor, you have available two flat plates of aluminum (area = 180 cm2), a sheet of paper (thickness = 0.10 mm, k= 3.5), a sheet of glass (thickness = 2.0 mm, . k= 7.0), and a slab of paraffin (thickness = 10.0 mm, k=...

Hi, I was just going through a question in my Physics textbook today. In calculating the electric field (E=sigma/epsilon0) ... sigma = charge density = q/Area ... they have used the area as pi*r^2, I can't understand why this was done? shouldn't the area of the parallel plate capacitor be...

Homework Statement An infinite, thin, uniformly charged rod (charge density lamda) is situated parallel to a metal plate at a distance d above it. Calculate the E-field close to the surface of the plane as a function of perpendicular distance to the rod. The Attempt at a Solution I...

i need to find max shear stress at a point on a plate (with a hole) under tension. i found using experimental data the principle strains at the point but i need to find the max shear stress using this data to compare it with a result found analytically. any suggestions?

Homework Statement Dear friendes, I have just measured the strain of a composite plate at it's surface. It was an impact test. I have only epslon x. How can I find the plate defection? Plate size is equal to 10*10*0.2 cm. Homework Equations The Attempt at a Solution

Homework Statement A 4.00 kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 2.75 mm deep, what is the average force exerted by the plate on the ball during the impact? Homework Equations KE=1/2mv^2 F=ma Wgrav=mgh The Attempt at a...

A square metal plate 0.180 meters 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 = 27.0 N and F3 = 14.0...

Question: An electron with a velocity of 3.00x10^6m/s[horizontally] passes through two horizontal parallel plates, as in the attached diagram. The magnitude of the electric field between the plates is 120N/C. The plates are 4.0cm across. Edge effects are negligible. a) Calculate the vertical...

Im having trouble calculating the capacitance of a non-parallel plate capacitor where separation at one edge is d-a and the other it is d+a, assuming a<<d. I'm supposed to prove that C= epsilon_not A/d (1+a^2/3d^2). Thanks for the help.

An electron travels with speed 1.0 X 10^7 m/s between two parallel charged plates. The plates are separated by 1.0 cm and are charged by a 200V battery. What magnetic field strength and direction will allow the electron to pass between the plates without being deflected.? F= qvBsin\theta...

Homework Statement (Q) Calculate the center of mass of a semi-circular metal plate of uniform density ρ and thickness t. Let the radius of the plate be a. The mass of the plate is thus 1/2 (ρπat2). In your co-ordinate system, you must consider the x-axis passing through the bottom of the...

URGENT QUIZ TOMMOROW - Circular Plate Tension Question Homework Statement Weight is 600N, and they form 30 degree angles with the vertical Homework Equations determine the tension in each wire The Attempt at a Solution I realize the two wires on the side are both 100 degrees...

Hi all. I'm struggling to understand something about PP capacitors. Let's say there is no battery connected to a PP capacitor. Why does the potential (V) INCREASE when the plates are moved farther apart? - we know that: dv = -Ed (in a constant E) however as d increases, E...

2 infinite parallel plates separated by a distance s are at the potentials zero and V0. find the surface charge densities on the plates. I got the answer that it first calculate E and then as 1. x=o, Ex = σ / ε, then could know σ 2. x=s, Ex = - σ / ε ---> here's what I don't know. why...

Hello, I am trying to figure out how to calculate the diameter of an orifice for a pill loop in an oil heater and pump. The hot oil is used to heat fuel in a heat exchanger, and is driven by a positive displacement pump. There is a spill loop with an orifice plate, and the requirement is...

I am having a really tough time providing an argument for myself over why the answer is true: The question: A parallel plate capacitor is attached to a battery that supplies a constant potential difference. While the battery is still attached, the parallel plates are separated a little...

Homework Statement It's not a homework problem, but an engineering problem I try to solve before I delve into experimentation :smile: I have a source of heat (SSR - a solid state relay) that's well thermally coupled to the inside of a steel box. The thermal resistance between the SSR and the...

For some reason I'm having issues today figuring out what size base plate to make for a post that has a 30lb wieght at 50" from the floor? Does anyone have a simple formula? I just want to post to not tip over without any outside forces acting on it. Thanks.

Mini Cathodically-Protected steel plate... Hi guys/gals: I am doing a project on cathodic protection. If I have a steel and zinc plate, does bolting them together with nothing at the interface suffice as Cathodic Protection? It looks too simple to be true. So I need your help to validate the...

Homework Statement A parallel plate air-filled capacitor is being charged as in figure. The circular plates have a radius of 4.0 cm, and at a particular instant the conduction current in the wires is .280 A. A. What is the displacement current density (jD) in the air space between the...

Hi, I'm constructing an interferometry experiment, in which I'm using a Michelson-Morley-type interferometer. However, the only beam splitter I have which preserves polarization is physically small (a few mm), and so in my setup the beam in each arm is not split. The reflection off the mirror...

i was going through the proof of the classical image problem in which u have agrounded conductor and you have a charge q above it and u r asked to find potenntial at all points above the conductor the proof uses the fact that the potential due to the sheet at "all" infinities is 0.how does one...

Two days ago in my physics class, one of my friends asked me a question: "There are 2 identical circular coils with radius 'r', length 'l' and 'n' no. of turns placed with their axes lying on a straight line, and current is let to pass through them so that mutual induction is observed.What...

(Repost of thread, wrong forum). Hi all, I'm writing a simulation of Chladni plates in Max/MSP and hope to use it in granular synthesis. I have found two formulas on the web; square and circular plate. I understand the square but the circular is quite confusing as I'm not a mathematician...

If I have a sheet of copper, how can i calculate its resistance? do i just take the surface area of the thin side and compare it on an AWG chart?

The problem is: Consider a parallel-plate capacitor with plates of area A and with separation d. Find F(V), the magnitude of the force each plate experiences due to the other plate as a function of V, the potential drop across the capacitor. Express your answer in terms of given quantities and...

A parallel-plate capacitor has an area of 4.77 cm2, and the plates are separated by 1.06 mm with air between them. It stores a charge of 403 pC. What is the potential difference across the plates of the capacitor? alright so i changed the area to .0477m^2. then i changed the distance between...

Homework Statement Use an integral form of the Gauss law to show how the magnitude of D inside the capacitor depends on the charge on the plates of a parallel plate capacitor and their area. Homework Equations Gauss \int{E.nda}=\frac{\rho}{\epsilon_{0}} \nabla.D=\rho where div...

I am really confused. Would you please tell me what the turbulent boundary layer thickness is on a flat plate? There is a well-known Schlichting formula in the previous editions of his book “boundary layer theory”, which is: \delta = 0.37 X Re^{-0.2} But actually I could not find this...

I've recently started studying Laplace's equation and it's solution under various simple circumstances in electrostatics. I tried to solve the equation for a parallel plate condenser system, but I couldn't meet the boundary conditions. I had two plates, one placed on xz plane at y=0 (with...

Can anyone help with how to find the analytical solution to problem involving finding the stress concentration around a circular hole in a flat plate. The plate is has tensile load on both sides.

Hi, Please guide me in calculating the shear stress value for a Annular plate with constant thickness.. My inputs are Outer radius, Inner radius, Load acting thickness. and the material properties. I need to calculate the Shear stress value at the inner edge. The constraints are the...

Hi all! I am required to find the velocity distribution of the flow around an infinite plate that suddenly starts moving with a constant speed U_o. The solution has already been worked out, but I still do not understand all of it. The part that is perplexing to me is where they use the...

Homework Statement A parallel-plate capacitor has plates with an area of 445 cm2 and an air-filled gap between the plates that is 1.51 mm thick. The capacitor is charged by a battery to 575 V and then is disconnected from the battery. There is 4.311536113 x 10 ^-5 J of energy stored in the...

If you have two parallel plate capacitors side by side and the electric field in one is constant. If you vary the electric field in the other, will it interfere with the electric field that was constant?

Does anyone know of a reference that describes the effect of adding a quarter wave plate or even a half wave plate placed at 00 / 90 0 and 450 positions in just one leg of a EPR entanglement polarization experiment. This would be in addition to the half wave plate in each leg already in place...

Is there a way to chemically clean this type of exchanger from graphite impurities (tiny particles) ? is possible to chemically remove coke,soot,graphite at all? we clean it with xylene but that doesn't help tnx

Homework Statement Assignment is located at: http://typhoon.wcp.muohio.edu/boardman/GLG444/Exercises/PTect/BathySedAge.html" Homework Equations N/A The Attempt at a Solution I can not figure out the following: 1. a. Calculate the depth to the ocean crust (sediment depth plus...

hi i'm considering to do something which collect the number plate and put it inside the bumper so the no plate doesn't appear. i'm considering to electro magnetisim or something similar. can someone give some help? by the way i need to do this system for the speed camera so it doesn't...

EDIT: I figured it out.Homework Statement A parallel-plate capacitor of width 2w , length L and separation d is partially filled with dielectric material of \epsilon_0 \epsilon_r . A voltage V_0 is applied. 1. Find \vec D , \vec E , \rho_S [/itex] ================ -------...

I am trying to solve this problem using lagrangian motion but I have no idea how to use it. It can be solved using mass conservation and force momentum equation but we are supposed to solve it with continuity. How would I go about this? Continuity: \frac{ Dp }{Dt} = \delta u / \delta x +...

Determine the tension in the support rope and the forces of the hinge on he uniform rectangular mass below. The length on the rect. is 12 and the height is 6m. The angle that the rope makes with the rectangle is 30 degrees. ____ I broke up the hinge forces into x and y components...

I'm supposed to show that while a capacitor is being charged, the energy flows into the region between the plates at the same rate as the electrostatic energy in the capacitor increases. I'm not sure exactly what is being asked of me... are there formulae for these? I feel stupid.

Hello, I really need help on this question, the wave travels normal to a thin plate made of N thin parallel layers of thickness d1,d2...dN and refractive indices n1,n2...nN, Ignore all the reflactions ,what is the complex ( which I thought transmittane is always real )transmittance of the...

I'm having a hard time with these center of mass problems. The lecture that my professor gave on this wasn't very descriptive. Could someone show me the whole process of finding the center of mass? A uniform plate of height 0.720 m is cut in the form of a parabolic section...

My homework problem goes like this: A uniform plate of height H = 1.39 m is cut in the form of a parabolic section. The lower boundary of the plate is defined by: y = 0.25 x2. The plate has a mass of 4.67 kg. Find the moment of inertia of the plate (in kgm2) about the y-axis. I know...