Mathematical and Physical Journal
for High Schools
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Problem P. 4437. (April 2012)

P. 4437. The two endpoints of an 8-m long weightless thread are fixed at the same height at a distance of 4 m. An object of mass 10 kg is hung onto the thread and can move frictionless.

a) What is the magnitude of the horizontal force that must be exerted on the object to keep it at rest on the thread exactly below one of the endpoints of the thread?

b) If the object is released from this position to what speed can it speed up?

(4 pont)

Deadline expired on May 10, 2012.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. a) N.

b) v3 m/s.

Statistics:

 96 students sent a solution. 4 points: Agócs Fruzsina, Balogh Tamás, Baumgartner Róbert, Beke Gabriella, Bolgár Dániel, Csipor János, Czigány Máté Gábor, Dávid Bence, Dinev Georgi, Emri Tamás, Farkas-Szabó Dominik, Fehér Zsombor, Fekete Panna, Fülep Andrea , Garami Anna, Holczer András, Homonnay Bálint, Horváth Dániel, Jagicza Tamás, Janzer Barnabás, Janzer Olivér, Kiss 666 Péter, Kollarics Sándor, Koncz Gabriella, Mázik László, Medek Ákos, Mihály 930 Ákos, Morvay Bálint, Olosz Balázs, Papp Roland, Pázmán Zalán, Sándorfi Kristóf, Sárvári Péter, Seres Imre, Simig Dániel, Szabó 928 Attila, Szabó 996 Barnabás, Szász Norbert Csaba, Szélig Áron, Szép Márton István, Szigeti Bertalan György, Ürge László, Vajda Balázs, Varju Ákos, Wiandt Péter. 3 points: 14 students. 2 points: 23 students. 1 point: 5 students. 0 point: 7 students. Unfair, not evaluated: 2 solutionss.

Problems in Physics of KöMaL, April 2012