Modeling Dynamic Systems: How does the Moon move?

Modeling Dynamic Systems: How does the Moon move? The bright memory of my teacher - the first dean of the Physics and Mathematics Faculty of the Novocherkassk Polytechnic Institute, the head of the department "Theoretical Mechanics" Alexander N. Cabelkova
 
 

Introduction


 
 
August, summer is coming to an end. The people furiously jerked to the seas, but it is not surprising - the season itself. And on the habra, meanwhile, In a violent color, pseudoscience disintegrates and smells. . If we talk about the topic of this issue of "Modeling ", then we will combine business with pleasure - we will continue the promised cycle and quite ...[/h]
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The construction of the orbits of celestial bodies using Python

The construction of the orbits of celestial bodies using Python  
 

Reference system for determining the orbit


 
To find the trajectories of relative motions in classical mechanics, we use the assumption of absolute time in all reference frames (both inertial and non-inertial).
 
 
Using this assumption, let us consider the motion of one and the same point in two different reference frames K and K ', of which the second moves relative to the first with an arbitrary speed  
 
We shall describe the motion of a point in the system K 'by the radius vector :
 
 
 
 
and the relative velocity is  
 
 
mathcad .
     Reference system for determining the orbit  To find the trajectories of relative motions in classical mechanics, we use the assumption of absolute time in all reference frames (both inertial and non-inertial).  Using this assumption, let us consider the motion of one and the same point in two different reference frames K and K ', of which the second moves relative to the first with an arbitrary speed   We shall describe the motion of a point in the system K 'by the radius vector :     and the relative velocity is      mathcad . ...[/h]
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Send an anonymous SMS from the Console to the desired number using the service bytehand and C ++

Send an anonymous SMS from the Console to the desired number using the service bytehand and C ++Sometimes it becomes necessary to send an anonymous message to the desired addressee without using your phone or when you only have a computer, a working Internet and an open console.
 
 
In many films there is a time when a hacker hacking a person needs to send a message to his number in order to distract or frighten him and in such situations the most important is that when a person calls to the number from which the SMS came you do not have a smartphone screen and not the music began to play. Oops An awkward situation. In this thread, we'll write a program in C ++ that will send SMS without ...
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Numerical methods for solving equations of elliptic type

Numerical methods for solving equations of elliptic type

Introduction


 
The most common equation of the elliptic type is the Poisson equation.
 
Many problems of mathematical physics are reduced to the solution of this equation, for example, problems of the stationary temperature distribution in a solid, diffusion problems, problems of the distribution of an electrostatic field in a nonconducting medium in the presence of electric charges, and many others.
 
 
To solve elliptic equations in the case of several measurements, numerical methods are used that allow one to transform differential equations or their systems into systems of algebraic equations...[/h]
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80% of self-service outlets are threatened by

80% of self-service outlets are threatened bySince small years, I've always been interested in testing, especially in the field of security, but by the way, I have not become a tester, but sometimes I like to poke other people's machines and look for vulnerabilities.
 
 
I remember when the first time known cash receipt machines were opened, when updating the software somehow the browser window popped out and rushed that we just did not do it, I think many have already written about this and since then the security of applications started to be more serious.
 
 
Not so long ago in the fast food chains began to appear convenient cash register ...
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How I standard C ++ library wrote 11 or why boost is so terrible. Chapter 4.2.

How I standard C ++ library wrote 11 or why boost is so terrible. Chapter 4.2.

The summary of the previous parts


 
Because of the limitations on the ability to use the C ++ 11 compilers and the non-alternative to boost, there was a desire to write your own implementation of the standard C ++ 11 library on top of the C ++ 98 /C ++ 03 library supplied with the compiler.
 
 
were implemented. static_assert , noexcept , countof , as well as after reviewing all nonstandard defenses and compiler features, information has appeared on the functionality that is supported by the current compiler. The implementation of is included. nullptr , which is selected at ...[/h]
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A heavy heritage of the past. Windows Command Line Problems

A heavy heritage of the past. Windows Command Line ProblemsForeword from the author, Richard Turner of Microsoft. This is an article about the command line: from its appearance and evolution to plans for a capital repair of Windows Console and command line in future versions of Windows. Whether you are an experienced professional or a novice in IT, we hope that you will find the article interesting.
 
 

A long time ago in a far-distant server


 
From the first days of the development of computer science, people needed an effective way to transfer commands and data to the computer and see the result of these commands /calculations.
 
 
One of the first ...[/h]
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How I standard C ++ library wrote 11 or why boost is so terrible. Chapter 4.1

How I standard C ++ library wrote 11 or why boost is so terrible. Chapter 4.1

The summary of the previous parts


 
Because of the limitations on the ability to use C ++ 11 compilers and the non-alternative boost, there was a desire to write your own implementation of the standard C ++ 11 library on top of the C ++ 98 /C ++ 03 library delivered with the compiler.
 
 
were realized. static_assert , noexcept , countof , as well as after reviewing all nonstandard defenses and compiler features, information has appeared on the functionality that is supported by the current compiler. The implementation of is included. nullptr , which is selected at the compilation ...[/h]
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Notepad in Windows received the first significant update in two decades

Notepad in Windows received the first significant update in two decadesThe reason why Notepad (notably Notepad) has suffered the fate of an ugly duckling has long been of little interest to anyone. Until the unexpected happened
 
 
It's hard to believe, but Notepad is one of the most famous, ancient and at the same time the simplest Microsoft applications - waiting for a very large update . It is important to note that this program (from the basic delivery package of most of all Windows versions) for almost a quarter of a century roamed from one release of the operating system to another practically without any changes.
 
 
It's hard to say what happened in ...
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