Problem M. 263. (October 2005)
M. 263. Fill the washbasin with some water, wait until the water has a smooth surface than (using a rope or a chain) suddenly pull out the plug and let the water drain away. Measure the time while the washbasin is emptied, as a function of the amount of water. Endeavour to investigate both cases: when there is, and there is no whirl in the water.
Deadline expired on November 11, 2005.
27 students sent a solution. 6 points: Illés Máté, Láng Marcell, Meszéna Balázs, Tüzes Dániel. 5 points: Kocsis Vilmos, Kőrösi Márton, Mészáros 639 Ágnes, Mirk Katinka, Szabó 001 Áron. 4 points: 4 students. 3 points: 6 students. 2 points: 7 students. 0 point: 1 student.