Recent content by RodionGork

Hi Friends and Colleagues! Here comes a book (or rather one chapter of it) recommendation. Yesterday I was asking in some other thread about situation of starship being attracted to the star, found in some old SF book. In the end I decided to refresh events described in the book - and started...

Hi Friends! Regard the 2 kW electric kettle and 60 W incandescent bulb - what happens if we plug them in series? It is the problem I often ask my students somewhere at the end of the term to check if they remember basic "laws" about electricity. Recently I started collecting some exercises on a...

Thanks for the hint, after some manipulations I was able to edit the post :) Went reading about atoms melting/fusing into the surface of high-speed objects, sounds curious! That's true :) it would be interesting side-task to make comparison of cases planet / starship. though we may expect that...

Diophantine equations deal with integers or at best rational values. Such problems so to say have "singularity" at every point where they exist. non-existing derivatives etc. Physics on the other hand normally deals with really real values, smooth changes of every parameter etc. The only field...

Ah, sorry for I failed to make myself clear :) I think of creating a task which requires to figure out whether ship will be able to fly by (in a somewhat modified hyperbola) or it shall lose so much energy that its speed is below the escape value and it will spiral down by and by, just as you...

In the "Andromeda Nebula" novel the author (Yefremov, 1957) describes dramatic story of a starship being inadvertently directed into the neighborhood of the "Infrared (Iron) Star" - so it was not discovered by navigators until too late. The ship is on the return route and doesn't have enough...

> The energy lost to wind resistance (ultimately heat) increases exponentially Is this precise? I thought "viscous friction" from the air is proportional (in force) to the square of the speed, thus energy loss also should be polynomial... intuitively, bullets won't fly if it is exponential...

Hi Friends and Colleagues! It so happened I give classes of electronics in certain local school (which itself is physics-oriented) - as a hobby, once a week, perhaps more than 15 years already. Meanwhile by occupation I'm a meek programmer and years ago I created some programming-puzzles...