Mathematical and Physical Journal
for High Schools
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Problem P. 3877. (March 2006)

P. 3877. The planes in airports are pulled by small lorries loaded by heavy concrete blocks. What is the greatest acceleration of a lorry of mass m if it pulls a plane of mass 70 tons. Find the least mass of the lorry which is able to move a plane of mass 70 tons, if the coefficient of static friction on wet concrete is 0.4 and on dry concrete is 0.8, and the coefficient of rolling friction is 0.02.

(4 pont)

Deadline expired on April 11, 2006.

Statistics:

 93 students sent a solution. 4 points: Antal 888 Zoltán, Beck Zoltán, Blázsik Zoltán, Bogár 560 Péter, Borbély Adrienn, Boros Csanád Örs, Csikós Ádám, Csire Gábor, Drozdy András, Dudás János, Enczel Dávid, Engedy Balázs, Filep Tibor, Fischer Richárd, Fülöp Bálint, Gresits Iván, Harsányi Szabolcs, Hegyi Ádám, Hevesi Péter, Hujter Mónika, Hunyadi Dávid, Kónya 495 Gábor, Kovách Marcell, Kunsági-Máté Éva, Mándi Gábor, Matulik Gábor, Mészáros 001 Balázs, Molnár 811 Kristóf, Nagy 317 Péter, Nagy 555 Zoltán, Nagy 897 Zsolt, Németh Dorián, Nigicser Bálint, Pálovics Róbert, Pásztor Attila, Roósz Gergő, Sebők Tamás, Szabó 319 István, Széchenyi Gábor, Szécsényi Ágnes, Székely Gergely, Szilágyi Zsombor, Szolnoki Lénárd, Tóth 123 László, Tűri Balázs, Vécsi Áron, Werner Miklós, Zöld Péter. 3 points: 22 students. 2 points: 13 students. 1 point: 10 students.

Problems in Physics of KöMaL, March 2006