Mathematical and Physical Journal
for High Schools
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Problem P. 3904. (September 2006)

P. 3904. The volume of a rubber ball is 600 cm3. When it floats on the surface of water 80% of its volume is above the water. a) Find the average density of the ball. b) If the ball is pushed down, and immersed in the water, what is the force with which it can be kept under the water?

(3 pont)

Deadline expired on October 11, 2006.

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

Megoldás. a) A víz sűrűségének 20 százaléka 200 kg/m3.

b) 4,7 N.


392 students sent a solution.
3 points:298 students.
2 points:24 students.
1 point:48 students.
0 point:16 students.
Unfair, not evaluated:6 solutions.

Problems in Physics of KöMaL, September 2006