Mathematical and Physical Journal
for High Schools
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Problem P. 4555. (September 2013)

P. 4555. There is a 4-m long, 1.2 kg chain, wound small, at the bottom of a 2-m deep lake. At least how much work is to be performed while the chain is pulled out totally from the lake, by holding one of its end, and moving it vertically? The density of the material of the chain is 3000 kg/m3.

(4 pont)

Deadline expired on October 10, 2013.

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

Megoldásvázlat. \(\displaystyle W=39{,}2~\)J.


164 students sent a solution.
4 points:101 students.
3 points:11 students.
2 points:33 students.
1 point:12 students.
0 point:7 students.

Problems in Physics of KöMaL, September 2013