Problem G. 923. (April 2026)
G. 923. A one-litre cubic container holds half a litre of mercury and half a litre of water. Another container, with twice the linear dimensions, is likewise filled with mercury and water. The hydrostatic pressure at the bottom of the two containers is the same.
a) What is the hydrostatic pressure at the bottom of the containers?
b) What quantities of mercury and water are there in the second container?
(4 pont)
Deadline expired on May 15, 2026.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. a) A kisebb kockában 5 cm magas a higany és felette ugyanennyi a víz. Ezek hidrosztatikai nyomása:
\(\displaystyle p=\left(\varrho_\mathrm{Hg}+\varrho_\textrm{víz}\right)g\frac{h}{2}=7160\,\mathrm{Pa}.\)
b) A nagyobb kockában \(\displaystyle y\) cm a higany és felette \(\displaystyle 2h-y\) a víz. Ezek együttes nyomása megegyezik a fentivel:
\(\displaystyle p=\left(\varrho_\mathrm{Hg}y+\varrho_\mathrm{víz}(2h-y)\right)g=7160\,\mathrm{Pa},\)
amiből \(\displaystyle y=42\,\mathrm{mm}\) a higany magassága és \(\displaystyle 2h-y=158\,\mathrm{mm}\) a vízé. Ezek szerint a nagyobbik edényben 1,68 liter higany és 6,32 liter víz van.
Statistics:
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Problems in Physics of KöMaL, April 2026