IPT 2018 IPT connect | IPT 2018 Physics Fights Ranking Problems Participants Jury members

17. Balancing pebble

Stones which are taken by wind on the ice of Baikal Lake can be found after some time staying on a thin «stand». Reproduce and explain this «stand» phenomenon and estimate the curve of the stand depending on the important parameters.

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China

4.00

Colombia

7.00

Croatia

5.20

France

9.40

Germany

6.80

7.60

Italy

6.80

6.00

Poland

7.60

Sweden

6.80

Ukraine

8.20

7.80

MEAN

6.70

6.85

7.25