Mathematical and Physical Journal
for High Schools
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Problem P. 4362. (September 2011)

P. 4362. 10 cm from a tap the diameter of the narrow water stream, flowing from the tap, is 2 mm. How long does it take to fill a half-litre mug?

(4 pont)

Deadline expired on October 10, 2011.

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

Megoldás. A vízsebesség \(\displaystyle \sqrt{2gh}=\)1,4 m/s, a vízhozam \(\displaystyle v\cdot r^2\pi=4{,}4\cdot 10^{-6}~{\rm m^3/s},\) a töltési idő 1,9 perc.


160 students sent a solution.
4 points:97 students.
3 points:19 students.
2 points:10 students.
1 point:15 students.
0 point:14 students.
Unfair, not evaluated:5 solutions.

Problems in Physics of KöMaL, September 2011