I wait for first simulation that will explain below problem

ENGLISH

1 http://youtu.be/LUNBgQPF99w


http://maroszmach.blogspot.com/

http://old-physics.blogspot.com/


POLISH

http://fizyczny.net/viewtopic.php?t=36926

1 http://youtu.be/FUoTQt_nBBU