Mathematical and Physical Journal
for High Schools
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Problem P. 4007. (October 2007)

P. 4007. In a sample of Helium gas an atom of speed 800 m/s reaches another atom of speed 600 m/s, which moves in the same direction, and they collide elastically. What can be the angle between the velocity vectors after collision?

(5 pont)

Deadline expired on November 12, 2007.


Statistics:

69 students sent a solution.
5 points:Almási 270 Gábor András, Apatóczki Bernát, Berta Katalin, Csató Bertalan, Csengeri Béla, Deli Gábor, Filep Tibor, Fonyó Dávid, Földes Tamás, Gacsályi Kinga, Gulyás Máté, Harsányi Szabolcs, Hlatky Dávid, Iván Dávid, Korponovitcs Dávid, Kupcsik Réka, Lovas Lia Izabella, Marák Károly, Nagy 648 Donát, Pásztor Árpád, Patartics Bálint, Patonay Gergely, Rárósi Dávid, Szikszay László, Szolnoki Lénárd, Tolner Ferenc, Tószegi Károly, Tóth 123 László, Tóth 222 Barnabás, Tóth Norbert, Várnagy Zoltán.
4 points:Benyó Krisztián, Bodosi Eszter, Márkus Bence Gábor, Papp Ádám, Para Attila, Sándor Bulcsú, Tolnai Gábor, Vida György, Wang Daqian.
3 points:9 students.
2 points:3 students.
1 point:11 students.
Unfair, not evaluated:6 solutions.

Problems in Physics of KöMaL, October 2007