Mathematical and Physical Journal
for High Schools
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Problem P. 4424. (March 2012)

P. 4424. A 20-litre plastic can contains petrol. The can is floating on the surface of the water of a lake, such that one-third of the volume of the can is out of the water. The mass of the empty can is 0,78 kg. The density of petrol is 720 \frac{\rm
kg}{\rm m^3}, the density of plastic is 1300 \frac{\rm kg}{\rm m^3}. Approximately how many litres of petrol are there in the can?

(4 pont)

Deadline expired on April 10, 2012.


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

Megoldás. Kb. 18 liter.


Statistics:

185 students sent a solution.
4 points:164 students.
3 points:11 students.
2 points:6 students.
1 point:1 student.
0 point:2 students.
Unfair, not evaluated:1 solution.

Problems in Physics of KöMaL, March 2012