Mathematical and Physical Journal
for High Schools
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Problem P. 4404. (January 2012)

P. 4404. A floating wooden-cube of density 600 kg/m3, and of edge 10 cm, is pushed down very slowly right below the surface of the water a) in a lake; b) in a vessel the area of the bottom of which is 3 dm2. Plot the force as a function of the displacement of the cube, and calculate the work done in both cases.

(4 pont)

Deadline expired on February 10, 2012.

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

Megoldás. A legnagyobb erő mindkét esetben ugyanakkora, de a kis edényben a megemelkedő vízszint miatt rövidebb úton történik a munkavégzés.


146 students sent a solution.
4 points:63 students.
3 points:18 students.
2 points:26 students.
1 point:21 students.
0 point:16 students.
Unfair, not evaluated:2 solutionss.

Problems in Physics of KöMaL, January 2012