Plate Definition and 1000 Threads

So the question is A rectangular plate has length l, width w and thickness t. Its density is constant across the width, but varies with distance from one end as ρ=ρo [1 + (x/l)^2] Find the plate’s mass and the coordinates of it’s centre of mass. I Have had a bash at this question, thinking...

Hello everyone, I am wondering how to properly go about calculating the stresses caused by bending on an angled flat plate. Two approaches seem valid but they give much different results: -Calculate the new area moments of inertia for the angled flat plate (new Ixx, ymax)...

Hello everyone ! Homework Statement In an isotropic aluminum plate (L = 200 mm, b = 50 mm, t = 1 mm), an additionally aluminum plate (l = 50mm, b = 50mm, tV = 0.5 mm) is glued in the center area. The plate is loaded in the y-direction with a normal force of Ny = 10000 N. Calculate the...

Hi, I would like to know what is the surface temperature of a material when it is radiated from another material at a certain distance. In other words: I have a material at 120°C (aluminium) and another parallel plate of area A faced to the first one at 10cm of distance. What is the surface...

Hi, I've been trying to calculate the diameter for an orifice plate so that when inserted in a pipe it restricts the mass flow to the value I want (1.5 kg/s of compressed air, total pressure= 400 psia, T=300K). So essentially I am trying to design a choke plate. When a flow goes across an...

What would have been if the opposite and equal charge wouldn't have been induce on 2nd conductor in parallel plate capacitor when connected to a battery

what is diff in application of 3 & 4 roller plate rolling machine. which type of rolling machine more usefule for 6 mm plate... & please suggest the ways to reduce the flatness of end portion after rolling ...

Homework Statement On a thin infinite metal plate, which is ##d## thick and has got electric conductivity ##\sigma ##, two electrodes are applied. The distance between the electrodes is ##r## and the potential is ##U##. Describe the magnetic field anywhere in space. Ignore the contribution...

I was googling to see if a bomb could disrupt a tornado and I came across this thread here ( https://www.physicsforums.com/showthread.php?t=692975 ) and I saw this graphic posted there (see attached thumbnail below). And it got me to wondering, if you made a giant, massive, strong metal plate...

Hi, Can anybody help me withg the following problem: A rectangular plate with points starting from top left corner and going clockwise:: A B C D. Sides CD and DA are simply supported, and a point force F is applied anywhere on the surface. I am looking for the bending stress distribution...

This is sort of statics, but this came up in my physics class before. You have a plate, supported only in the middle by a simple support. So, this beam is balanced on the support, and is bending under it's own weight. What shape does the beam take? I was thinking either a inverted parabola or...

Homework Statement Every second ##N_{Li}=2\cdot 10^8## atoms of ##_3^7Li## with kinetic energy ##30 MeV## is Coulomb scattering on ##_{26}^{56}Fe## plate ##d_{Fe}=0.3mm## thick with density ##\rho =7800kg/m^3##. Under angle of ##30^°## and ##r=0.2m## away from the plate we have a target with...

Homework Statement Two parallel plates, each having area A = 3558 cm2 are connected to the terminals of a battery of voltage Vb = 6 V as shown. The plates are separated by a distance d = 0.54 cm. 1) What is Q the charge on the top plate? 3.5*10^-9 C 2) What is U, the energy stored in...

Homework Statement A 2 mm thick plate of natural Silver absorbs 11% of neutron flux with kinetic energy 1 eV. What is the total scattering cross section for neutrons? ##\rho (Ag)=10500 kg/m^3## and ##M(Ag)=107.9kg/kmol## What is the ratio between the calculated cross section and geometric cross...

Homework Statement An electron is projected from a distance d and with initial velocity u parallel to a uniformly charged flat conducting plate as shown. It strikes the plate after traveling a distance l along the direction of projection. The surface charge density of the conducting plate is...

I'm trying to calculate the aerodynamic forces on a flat plate as a function of angle of attack. The drag force is calculated from F = ρ*V^2*A*Cd/2 Where ρ is the air density, V is the wind velocity, A is the area, and Cd is the drag constant. Simple question: For A, should I use...

Does anyone have any idea how I could begin to examine the field of two conducting plates which are side by side instead of parallel ?

Light bending in the "hot plate" model of curvature In the Feynman lectures, feynman describes the hot plate model of space curvature and shows that light is bent around the center of the plate, see Fig. 42-6 http://www.feynmanlectures.caltech.edu/II_42.html#Ch42-S1 However, the hot plate...

Homework Statement A circular steel plate of radius 15 cm is cooled from 350 C to 20 C. By what percentage does the plates area decorate ? Homework Equations A=∏r^2 Af = Ai (1+2∂ΔT) specific heat of steel = 12 x 10^-6 The Attempt at a Solution r = 15 cm = .15 m Ai = .070685 m^2...

hello here in this problem as you see we want to obtain the pressure between thew plate of capacitor my question is about the capacitor each plate electric filed equation. as we know the electric filed of an infinite plate is but the equation of an conductor plate is...

Homework Statement A rectangular plate of sides ‘a’ and ‘b’ is suspended from a ceiling by two parallel strings of length L each. The separation between the strings is ‘d’. The plate is displaced slightly in its plane keeping the strings tight. Find the time period of SHM. Homework Equations...

Hi, I am doing research on sound radiation of a plate due to bending waves. I have come across the Kirchhoff Plate theory, Euler beam theory and also the equations for the phase velocity of longitudinal, transverse shear and bending waves. What i am confused about is how these theories and...

Took apart a hot plate, nichrome is touching directly to the iron?? How is it not shorting out?

Hi guys I've a problem calculating the vertical jump from ground reaction force. We tested a person with a force plate, and we got this curve as a result: Homework Equations These are the equations, sorry for the danish language, but just look at the equations and not the text...

Homework Statement The Attempt at a Solution All I need to know is the acceleration acting on the particle after the potential is applied. v_f^2 = v_i^2 + 2ad (1*10^{-5})^2 = -(1*10^{-5})^2 + 2a(1*10^{-3}) a = 1*10^{-7} m/s2 Is this the correct approach to finding acceleration?

Homework Statement A parallel plate capacitor with capacitance C is charged to a value q and then isolated. The separation between the plates is then tripled. What was the work required to separate the capacitors?Homework Equations U=1/2CV^2 Q=CV C=ε0A/dThe Attempt at a Solution...

Electrostatics -- 3rd plate inserted into parallel plate capacitor Homework Statement This question is from the book by I.S Grant and W.R Phillips on Electromagnetism. Two large parallel plates of area A and distance d apart are maintained at potentials 0 and V. A third similar plate...

Hello guys, i have a problem in determining a thickness of a plate. i have a motor (m = 17 kg) attached to a plate. the design can be seen in the attachment. i need to know the dimension of "t".

A friend of mine was on his third floor balcony and saw someone vandalizing a wall almost directly below on the ground. He wanted to throw a plate from the balcony at the vandal. How dangerous would this be? If each floor is about 10 ft and my friend and the vandal are of equal height, that's...

Homework Statement An electron is fired at a speed vo = 5.6 ✕ 10^6 m/s and at an angle θo = -40° between two parallel conducting plates that are D = 2.5 mm apart, as in Figure P16.66. The voltage difference between the plates is ΔV = 103 V. Homework Equations F = Eq E = V/d a = F/m The...

Homework Statement A uniform square plate of mass m and side a can freely rotate about a vertical axis passing through one edge. It is initially at rest. A particle of mass m is moving horizontally and perpendicular to the plane of the plate with velocity u. The particle collides with the...

Hi all. I was wondering if anyone knows of an equation to use to calculate the thickness of a plate to withstand a pressure of 100psi. I am using an injection molding process where the walls of my mold will be subjected to 100psi, so I need to calculate a plate thickness that can withstand this...

First of all, Hi we haven't even learned the E = ((hc)/λ) in the physics class but we have this question on our test-exam and I hope that it's fairly easy: Homework Statement A metal plate is shone upon with a monochromatic light. When the wave-length is 550 nm a photo-electric effect is...

Hi everyone! This is my first post here, i hope to not make a fool of myself... Homework Statement I was asked to find the tension forces in the 4 wires by which a cabinet is suspended from the ceiling. The cabinet's centre of gravity does not coincide with its centroid, but is located...

LEV needs to be at 1m/s at the face. Let’s say area of LEV is .1 m2 What size plate (with holes or not in it) and weight is needed for the plate to fall off if the face velocity is less than 1m/s but the velocity is enough to keep the plate on the lev face if the speed is 1m/s or greater. I...

Hello Bruce .. I have problem regarding finding the center of mass of a rectangular plate practically. Also it is a geometric property i.e it mid point is the COM . but the plate is not homogeneous and high dense regions occur at the plate at some portions of the plate ... SO my COM is not at...

Homework Statement Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 1.70 ×109 electrons from one disk to the other causes the electric field strength to be 3.50 ×105N/C. What are the diameters of the disks? Homework Equations Refer to attachment...

Homework Statement If a steel plate with a hole of 10 cm in diameter is heated 35 degrees kelvin, what will the new diameter be? ##\alpha_L = 13 \cdot 10^{−6} K^{−1}##Homework Equations ##\Delta L = \alpha_L \cdot \Delta T \cdot L## The Attempt at a Solution If I understand the...

Homework Statement A flint glass plate 3.5 cm thick is placed over a newspaper. How far beneath the top surface of the plate would the print appear to be if you were looking almost vertically downward through the plate? Homework Equations N=1.66 for flint glass Apparent = d/n The...

My project is that I want to USB fire charger. Its a device that you place on or near fire that will use the Seebeck effect of a pelteir plate to charge a USB device. So far I learned that i will only get 1.2 volts from a pelteir connected with a Schottky diode. USB ports need 5 V to charge...

Homework Statement http://puu.sh/6i6HY.png Homework Equations Fe = q*Ee The Attempt at a Solution a) dx = vx*t 0.0682 = 4.92*106 * cos(68) * t t = 0.0682 / [4.92*106 * cos(68)] = 3.70036*10-8 seconds dy = dyi + vy*t + at2 0 = 0 + 4.92*106 * [0.0682 / [4.92*106 * cos(68)]] * sin(68) + a...

1. Find the centre of mass of a semi circular plate of radius R, the density of which linearly varies with distance, 'd' at the centre to a value '2d' at the circumference. 2. Xcom = (∫xdm)/M 3. I tried attempting the solution but I am not really knowing how to get dm in terms of dx

Hi all, I have started learning ansys workbench for steady state heat transfer based analysis. I am doing this analysis to validate analytical results given for heat transfer from a single plate fin. The fin tip is given a base temperature and heat transfer is calculated for natural...

Question taken from Griffiths Pg 185, Problem 4.19: For part (b): -Why are the electric fields the same whether in dielectric or in air? In part (a), they are clearly different! -Why is σ_{tot} = ε_{0}E = ε_{0}\frac{V}{d} -In calculation of capacitance, why is the total charge (\frac...

Homework Statement Estimate the required radius of each plate. The plates are separated in air by 0.01mm and has a capacitance of 400pF. There are 4 pairs of plates. Homework Equations c= εrε0*A(n-1)/ d The Attempt at a Solution Find area. Transposing for A A = dc/εrεo A=...

I ordinarily would put this up in a homework/ coursework forum, but this isn't either one, its just something I was curious about given that I am in a Mechanics class. So, I have done calculations for finding the gravitational force from a sphere and from a ring, and a flat circular plate. All...

Homework Statement Two related questions (from Electromagnetics by Notaros) The dielectric of a parallel-plate capacitor has two homogeneous parts, referred to as dielectric 1 and dielectric 2. The boundary surface between the parts is flat and parallel to the capacitor plates. The dielectric...

I have been trying to find out of Boyle's Law and plate tectonics are in any way shape or form related. Are they? If they are not, is there a way I can relate their movement to physics?

Hi all "A parallel plate capacitor in which plates of area A are separated by a distance d, has a capacitance C = \frac{Aε_{0}ε_{r}}{d} It is charged to a pd V. Neglecting edge effects, derive an equation for the electric field E in the capacitor, and show that the energy stored per unit volume...

Homework Statement A 45° triangular plate ABC built in at BC and loaded by a uniform pressure p0 on the upper edge AB. The inclined edge AC is traction free. Find the stresses in the plate. Homework Equations Stress function: \phi =...