Mathematical and Physical Journal
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# Problem P. 4905. (February 2017)

P. 4905. A one-metre-long vertical glass tube with one side open end closed the other is pushed into some liquid, such that its open end is at its bottom. The closed end of the tube is held at the level of the surface of the liquid. It is observed that the liquid fills a 7.7 cm-long part of the tube. The ambient air pressure is 100 kPa.

What is the density of the liquid?

(3 pont)

Deadline expired on March 10, 2017.

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

Megoldás. $\displaystyle \varrho=920~\frac{\rm kg}{\rm m^3}.$ (Ekkora például az étolaj sűrűsége.)

### Statistics:

 69 students sent a solution. 3 points: Balaskó Dominik, Bíró Dániel, Fazakas Réka, Fekete Balázs Attila, Háder Márk István, Jáger Balázs, Jánosdeák Márk, Kántor Bence, Klučka Vivien, Kolontári Péter, Kozák András, Mácz Andrea, Mamuzsics Gergő Bence, Markó Gábor, Merkl Gergely, Molnár 957 Barnabás, Molnár Mátyás, Nagy 555 Botond, Nyerges Dóra, Paulovics Péter, Pécsi 117 Ildikó, Póta Balázs, Stefán Boglárka Abigél, Szakály Marcell, Tófalusi Ádám, Tóth 111 Máté , Tóth 420 Péter, Turcsányi Ádám, Varga-Umbrich Eszter, Zsombó István. 2 points: Ardai István Tamás, Augusztin András Balázs, Csóka987 Benedek, Guba Zoltán, Hajdu 046 Ákos, Hajnal Dániel Konrád, Hanusz Fruzsina, Horváth 122 Aurél, Illés Gergely, Magyar Máté, Magyar Róbert Attila, Morvai Orsolya, Murányi Albert, Ónodi Gergely, Papp 121 Krisztina, Sugár Soma, Tóth Bence, Wesniczky Albert. 1 point: 12 students. 0 point: 9 students.

Problems in Physics of KöMaL, February 2017