Recent content by zandria

Unfortunately, due to the properties of exponentials, I don't think I can take the t out. If the exponents of the exponential were sums instead of products, the problem would be much easier and would allow me to factor out an e^t. But I'm not sure how to isolate the t in this specific equation.

1. I need to solve the following exponential equation for t. \frac{1}{20} =0.5 e^{-0.877t} - 0.05 e ^{-9.123t}

nevermind, figured it out. I did not define "i" as a variable in my list of integers

I am working with visual Fortran (f90 I believe) I have the following program and it says that I have 2 errors. I have narrowed it down to having something to do with my loop statement in bold. Is there something wrong that I'm not getting? program exercise1 implicit none...

Thank you. I was essentially doing the right thing on my first try before I changed everything, but I made an algebra mistake when trying to use cylindrical coordinates. Thanks for the short cut ... less room for stupid mistakes.

Homework Statement Determine the centroid of volume for a right circular cone with base diameter of 100mm and an altitude of 200mm. Homework Equations I know that if the my xy-plane is parallel to the base of the cylindrical cone then the x and y coordinates of the centroid must be...

I know that I can go to Build in the toolbar and click on "Compile invert.f90". And this comes up in the bottom window: --------------------Configuration: myproj - Win32 Debug-------------------- Compiling Fortran... C:\Program Files\Microsoft Visual Studio\MyProjects\myproj\invert.f90...

I downloaded 'Compaque Visual Fortran 6' This came with: WinDiff, VF reporter, Spy++, Process Viewer, OLE-COM object viewer, Fortran Module Wizard, Fortran Command Prompt, Error Lookup, Developer Studio, Dependency Walker. I guess my question is how to run a program once it is written. I...

I feel very silly for asking this but I have just downloaded Fortran 90 and am trying to figure out how to open the command window. I am used to using MATLAB which automatically opens a command window when you open the program. I have the option of opening the developer studio or the command...

Thanks. That's exactly what I needed.

Homework Statement \int_0^{\infty} sin(ax) / sqrt(x) dx Homework Equations The Attempt at a Solution I thought of using integration by parts, but that gets me nowhere. I'm not sure how to go about this problem.

Homework Statement I'm trying to verify the Fourier transform but am getting stuck on the integration. Here is the pair: f(x) = e^{-ax^2} \hat{f}(k) = \frac{1}{\sqrt{2a}}e^{-k^2/4a} a>0 Homework Equations I know that \hat{f}(k)=\int_{-\infty}^{\infty}f(x)e^{ikx}dx The Attempt at a...

delta tends to zero very quickly when x does not equal a (which is zero in this case) by definition of the generalized function . If that's right, then I think I get it. Thank you for your help.

thank you, i did leave out a minus sign. I will correct that above. Also, I think I was trying to make things more complicated than they actually are. But why does the first term when doing integration by parts go to zero? \boxed{[f(x)\delta(x)]_{-\infty}^{\infty}} - \int_{-\infty}^{\infty}...

1. The problem statement Show that: \int_{-\infty}^{\infty} f(x) \delta^{(n)}(x-a) dx = (-1)^n f^{(n)}(a) The Attempt at a Solution I am trying to understand how to prove: \int_{-\infty}^{\infty} f(x) \delta '(x) dx =- f'(x) I know that we need to use integration by parts, but I'm...