In mathematics and computational science, the Euler method (also called forward Euler method) is a first-order numerical procedure for solving ordinary differential equations (ODEs) with a given initial value. It is the most basic explicit method for numerical integration of ordinary differential equations and is the simplest Runge–Kutta method. The Euler method is named after Leonhard Euler, who treated it in his book Institutionum calculi integralis (published 1768–1870).The Euler method is a first-order method, which means that the local error (error per step) is proportional to the square of the step size, and the global error (error at a given time) is proportional to the step size.
The Euler method often serves as the basis to construct more complex methods, e.g., predictor–corrector method.
Homework Statement
Using the method of images discuss the problem of a point charge q inside a hollow grounded conducting sphere of inner radius a.Find
(a) the potential inside the sphere
(b) induced surface-charge density
(c) the magnitude and the direction of force acting on q
is there any...
In reading the posts re:Rustum Roy and electrolysis on salt I wondered if that method would work on other molecules? Not thinking about energy in and out, just how that or other means to separate a molecule's atoms could solve some problems such as pollution? Also, use of the term 'burn'...
Consider the scenario where there are two parallel conducting pipes of radius R separated by a distance d, with pipe 1 at a potential of -V and pipe 2 at a potential +V. I have seen from many sources that there is a very easy method of images solution to the potential outside the pipes, given...
The pioneering work by G. Lehmann, M. Taut, please see the attached files or download from wiley
On the Numerical Calculation of the Density of States and Related Properties,
http://onlinelibrary.wiley.com/doi/10.1002/pssb.2220540211/abstract
The question is how the middle line of Eq. (3.9)...
Homework Statement
[/B]
Homework Equations
This problem was from a practice exam. I know what V1 and V2 should be but can't get my answer to match. V1 should be -3.214 V and V2 should be -12.214 V
The Attempt at a Solution
See attached picture for my work. [/B]
I was wondering how I could measure the rate constant k for chemiluminescence reaction of luminol (when oxidised by H2O2. I was told that I can use a lux meter that measures the intensity of light emitted, but I'm not so sure how this can be done since the equation calculating the rate constant...
Homework Statement
2. Homework Equations
3. The Attempt at a Solution [/B]- So with the (from what i interpret of the notes this is needed) the same boundary conditions when time is fixed, we can relate the 'fundamental problem'- the initial condition ##t=0## given by a delta...
Homework Statement
Find a particular solution yp of the given equation:
y''+y=sinx+xcosx
Homework EquationsThe Attempt at a Solution
1) First I got the temporary yp: Asinx+Bcosx+(Cx+D)sinx+(Ex+F)cosx
2) Then I got the associated homogenous eq. check for to check for duplicates: C1cosx+C2sinx...
Homework Statement
Q1. Lindsay is twice as old as she was 10 years ago. Kimberly is half as old as she will be in 10 years.
Find Lindsay’s age now?
Find Kimberly’s age now?
Q2.
In 8 years Tiffany will be 3 times as old as she is now. The number of years until Tiffany will be 6 times as...
I've been recently studying the correlated-k method of calculating the absorption of EM radiation when passing through a sample of given thickness. I'm not sure if anyone here has experience on the same subject, but in case there is I have some questions...
Suppose I have a material sample that...
Hi! For my math investigation project, I was trying to predict the trajectory of an object in a projectile motion with significant air resistance by using the Euler's Method. But it seems like the differential equation involved there can easily be separated into different variables, and so it...
Homework Statement
Three points are given with errors on y coordinates.
(2.00,4.70±0.36); (4.00,6.8&±0.45); (5.00, 9.10±0.50)
Using LSQ method, find the error on slope.
Homework Equations
σm = σy√(n/Δ), where σy = √(1/n-2(Σ(yk - y(xk))^2)) and Δ = nΣxk^2 - (Σxk)^2
The Attempt at a Solution
I...
Homework Statement
the calculation can be
considerably simplified by using the so called method of images. In this method,
the electric field and potential produced by the induced charge distributed on the
sphere can be represented as an electric field and potential of a single point charge...
A couple of friends ##n = 1 \ldots N## of mine bet on the result of the next general election in Germany. We select the six most important political parties ##p = 1 \ldots 6##. For each party ##p## and each friend ##n## we have the forecast ##x_{pn}## and the official election result ##x_p##...
I am using panel- data for 30 countries over 25 years to estimate a regression model. Expenditure on cars is my dependent variable and then I use economic theory to find some explanatory variables.
First, is 30 countries and 25 years an ok sample? Or should years > countries?
Second, is it an...
Hi All
I need to do an evaluation of a pilot plant heat exchanger that we have installed and see if it would be better suited than our current bigger installations. I was trying to calculate the effectiveness of the heat exchanger but I keep on getting 1 with the NTU method. Below is the...
Homework Statement
Homework EquationsThe Attempt at a Solution
I tried differentiating both sides of 3 and re-arranging it such that it started to look like equation 2, however i got stuck with 2 first order terms z' and couldn't find a way to manipulate it into a function z.
I then tried...
Hello, I have the following PDE equation:
a*b/U(u)*V(v) = 0
where a and b are arbitrary constants, and U an V are two unknown functions. To me it appears this has no solution, however I would like to ask if anyone has some suggestions, such as transforming it to another type using Fourier or...
Homework Statement
Hamiltonian of charged particle in magnetic field in 2D is ##H(x,y,p_x,p_y)=\frac{(p_x-ky)^2+(p_y+kx)^2}{2m}## where ##k## and ##m## are constant parameters. For separation of this system use ##S=U(x)+W(y)+kxy+S_t(t)##. Solve Hamilton - Jacobi equation to get ##x(t), y(t)## ...
Homework Statement
12.81[/B] A train traveling at 20m/s is brought to an emergency stop. During braking,
the acceleration is a=-(7/4)+(t/16) m/s^2, where t is the time in seconds measured
from when the brakes were applied. (a) Integrate the acceleration from t=0 to
t=16s using Euler's method...
In the paper http://physics.unipune.ernet.in/~phyed/26.2/File5.pdf, the author solves the LC-circuit using Euler-Lagrange equation. She assumes that the Lagrangian function for the circuit is $$L=T-V$$ where
$$T=L\dot q^2/2$$ is the kinetic energy part $$V=q^2 / 2C$$ is the potential energy.She...
At the outset I am a novice in physics. i have constructed a rain water storing tank with a capicity of 1,20,000 litres. I propose to seal the tank so that there is no light penetrating inside the tank. My question now is how do I measure how many feet of water is left inside the tank? Can...
Hello Sir,
I would studying the theory of least square and I find that the derivative of the error summation between the predicated line points and the true data is equal zero. Why the first derivative is equal zero?
Homework Statement
This is not a homework but since asked me I'm posting it here. I know how to intergrate by parts and can do this using formula
But I'd like to do this using the tabular method
Question
Integrate xcos(x^2) using tabular methodHomework Equations
The table with derivative on...
Hi.
If I have a function f ( x , t ) = x - 6t with x ( t ) = t2 and I take the partial derivative of f with respect to x I get the answer 1 as t acts as a constant so its derivative is zero. But if I substitute t with x1/2 I get the answer 1 - 3x-1/2 which is obviously different and wrong , I...
I know Quine-McCluskey Tabular method & I also know Don't care. I can solve problems using them separately.
But this question below asking to use these two methods together to solve the problem...and so I find it complex.
I need an example how to solve this type of problem. .
Question ...
Homework Statement
In the book, Nuclear Reactor Theory, Glasstone, Bell, under section 2.2
SOLUTION OF THE ONE-SPEED TRANSPORT EQUATION BY THE SEPARATION OF VARIABLES, I have difficulty in understanding the derivation. Hope some one can explain the derivation or give a reference where the...
Homework Statement
The problem is attached.
Homework Equations
Isolating each x_i.
The Attempt at a Solution
I watched this video for the Jacobi method.:
I also watched this video for the Gauss-Seidel method.:
At least based on the videos mentioned above, it seems that the difference...
Hi,
I am new to spectral methods, does anyone have a good reference which shows some worked examples of formulating the method to be computed?
E.g. go from the general governing equations through transformation to the form which will be passed to a computer.
Cheers
Hi!
Can anyone tell me what the radial BAO size method is?
how do people use it to get to the H(z)?
I am reading the paper "Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data " by Zhang et al. and I think I am lost!
Can anyone tell me very simple, how they do...
Hi.
I am using the Hardy Cross method to simulate the gas flow inside a multiple hearth furnace (as shown in figure A). Figure B is a representation of the furnace's body as a pipe network. The segment A-AH represents the actual hEarth's, while segments B-AI and C-AJ represent the exhaust ducts...
Homework Statement
I have problem of obtaining the cross sectional area .
Homework EquationsThe Attempt at a Solution
Taking section 2-3 as an example , my working is [ (3.3 +4.8) / 2 ]* 5 = 20.25 , but the ans provided is 29.28 , how to get the 29.28 ?
Homework Statement
Draw the bending moment diagram
the top part is the question, the bottom part is the answer.
Homework EquationsThe Attempt at a Solution
There is a force at the wall in x and y direction and a moment ##F_x, F_y, M_w##
Sum of forces in x : ##F_x-1000=0, F_x=1000##
Sum of...
Hi there. I am writing a code to solve the diffusion equation in two dimensions using the Alternate Directions Implicit method: https://en.wikipedia.org/wiki/Alternating_direction_implicit_method
I haven't finished to write the code yet, but I am trying to be the most general as possible...
Homework Statement
When a rocket launches, it burns fuel at a constant rate of (kg/s) as it accelerates, maintaining a constant thrust of T. The weight of the rocket, including fuel is 1200 kg (including 900 kg of fuel). So, the mass of the rocket changes as it accelerates:
m(t) = 1200 - m_ft...
Homework Statement :[/B]
1.08g of ##NH_4 Cl## is boiled with 62ml ##\frac {N}{2}## ##NaOH## to expel ##NH_3## completely. 44ml of ##\frac {N}{4}## ##HCl## is required to neutralise the excess alkali. Calculate the percentage of ##NH_3 ## in ##NH_4 Cl##.
Answer given: 31.5%
Homework Equations...
I'm currently trying to solve the following two-point boundary problem by means of the shooting method:
To clarify, I'm investigating the optimal route of aerial/marine vehicles from one point to another point, considering a flow field.
* The starting and ending locations are set as x0, y0...
Homework Statement
In the third picture , I don't understand the circled part , add up the values in the diagonal .. How to do that ?
I don't understand how to get k13 , k14 , k21 , k22 , k33, k41 and k42 .
Homework EquationsThe Attempt at a Solution
As we see in the second picture , the k21...
What are the applications to normalize to 1?
what is the difference between the integral of de function in all the space equal to 1 with normalize to 1?
Homework Statement
A beam is given with a constant load. Calculate the deflection at the end of the beam. Use the integration method or method of navier with delta functions.
Homework Equations
See equations in my attached file.
The Attempt at a Solution
The red load you see on the drawing is...
Hi All,
Does anybody know how to solve the following PDE? I tried a similarity solution method where eta = y/f(x) (which I can do successfully without the C * U term) but was unsuccessful.
Thank you very much in advance!
Hi, I'm trying to study Runge-Kutta method and apply on a simple pendulum.
Using a timestep dt=0.1 (h=0.1) the pendulum increses energy of 1% every period...
while in this site:
https://www.myphysicslab.com/pendulum/pendulum/pendulum-en.html
decreses energy about 0.01%
What am I doing wrong...
Homework Statement
Maximize the profit function P = 3x - y - 2z subject to the following
x - y - z ≤ 15
2x - y + 2z ≤ 50
2x + y + z ≤ 39
, where x ≥ 0, y ≥ 0, z ≥ 0.
Homework Equations
Simplex method / Simplex algorithm
The Attempt at a Solution
Hello to everyone who is reading this. :)...
Hello! (Wave)
I want to check if the method of separation of variables can be used for the replacement of the following given partial differential equations from a pair of ordinary differential equations. If so, I want to find the equations.- $[p(x) u_x]_x-r(x) u_{tt}=0$
- $u_{xx}+(x+y)...
I had this setup (see attached photo) for the linear gate method in a γγ coincidence experiment. Using a Na22 source.
The pulse from the movable detector enables the gate of the MCB, and any corresponding pulse from the fixed detector that arrives within the gate interval will be considered...
$\tiny{17.2.01}\\$
$\textrm{ Solve the given equation by the method of undetermined coefficients.}$
\begin{align*}\displaystyle
y''+7y'+10y&=80
\end{align*}
$\textit{this is in the form}$
\begin{align*}\displaystyle
x^2+7x+10&=0\\
(x+2)(x+5)&=0
\end{align*}
$\textit{this is a...
Homework Statement
(Picture attached)
Question 1: The system starts at rest. Block a accelerates towards the bottom the the rod. Find the velocity of the block when it is at the bottom of the rod using the "vector method". So this was my midterm question today. I knew how to figure out how...