... 41st International Physics Olympiad, Croatia – Theoretical competition, July 19th, 2010 ( h) 2/4 (5) B , A from which we have h B2 1 A g Air Smoke (6) 1 We can treat the ... acquires velocity 41st International Physics Olympiad, Croatia – Theoretical competition, July 19th, 2010 3/4 Solution of Task a) The kinetic energy of the hot air released in a time interval t is ... Hot gh (20) 41st International Physics Olympiad, Croatia – Theoretical competition, July 19th, 2010 From this we get w 760 kg/s (21) 4/4 ...