Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 4108. (November 2008)

P. 4108. An ice-hockey player hits the puck with an initial speed of v0 towards the board fence. The mass of the puck is m and its radius is R. The puck is not rotating and the angle between the velocity and the board fence is . The component of the velocity of the puck which is perpendicular to the board fence changes by a factor of k (k<1). What will the rotational energy of the puck be after the collision with the board fence? The coefficient of kinetic friction between the board fence and the puck is and the friction on the ice is negligible.

(5 pont)

Deadline expired on December 11, 2008.

Statistics:

 56 students sent a solution. 5 points: Bali-Papp Donát, Bartha Zsolt, Boros Csanád Örs, Börcsök Bence, Budai Ádám, Csengeri Béla, Deák Zsolt, Farkas Márton, Fejes Máté, Filep Tibor, Galzó Ákos Ferenc, Garaguly Gergő, Gorzsás Anikó, Harsányi Szabolcs, Hartstein Máté, Hegedűs Csaba, Kovács 235 Gábor, Kovács Benjámin, Krämer Zsolt, Laczkó Zoltán Balázs, Lovas Lia Izabella, Maknics András, Márkus Bence Gábor, Mayer Martin János, Nagy Loránd, Najbauer Eszter Éva, Németh Gábor , Pálovics Péter, Pauleczki Péter, Pázmán Koppány, Somogyi József, Szabó 895 Dávid, Timár Máté, Tószegi Károly, Trényi Róbert, Túri Attila, Varga 777 Ádám, Zelei Kristóf. 4 points: Barancsuk Lilla, Benyó Krisztián, Berecz Dénes, Csóré András, Iván Dávid, Jakab Dávid, Kungl 008 Ákos, Patartics Bálint, Varju 105 Tamás, Vuchetich Bálint. 3 points: 5 students. 2 points: 1 student. 1 point: 1 student. 0 point: 1 student.

Problems in Physics of KöMaL, November 2008