Mathematical and Physical Journal
for High Schools
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Problem P. 4785. (December 2015)

P. 4785. The Milky Way is a so called spiral galaxy. Its shape is approximately a uniform density disc which has a small width with respect to its diameter. The Sun undergoes simple harmonic motion between the ``bottom'' and the ``top'' of this disc.

What is the period of the SHM, if the average density of the galaxy is \(\displaystyle 5.8\cdot 10^{-21}~{\rm kg/m}^3\)?

(5 pont)

Deadline expired on January 11, 2016.


Statistics:

27 students sent a solution.
5 points:Asztalos Bogdán, Balogh Menyhért, Bartók Imre, Blum Balázs, Csenger Géza, Csire Roland, Elek Péter, Forrai Botond, Ghada Alshalan, Iván Balázs, Juhász 326 Dániel, Kovács Péter Tamás, Németh 777 Róbert, Olosz Adél, Páhoki Tamás, Pázmán Előd, Sal Kristóf, Szentivánszki Soma , Szick Dániel, Szőke Dániel, Tófalusi Ádám, Tomcsányi Gergely.
4 points:Büki Máté, Di Giovanni András, Kasza Bence, Körmöczi Dávid, Pszota Máté.

Problems in Physics of KöMaL, December 2015