Mathematical and Physical Journal
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Problem P. 4185. (October 2009)

P. 4185. A bird can fly in the air at a constant speed v. There is a wind of speed v1 blowing from the North. Into what direction should the bird fly in order to move in the East--West direction? What is its speed with respect to the Earth? Data: v=40~\frac{\rm km}{\rm
h}, v_1=10~\frac{\rm m}{\rm s}.

(3 pont)

Deadline expired on November 10, 2009.

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

Megoldás. Az északi irányhoz képest 25,8 fokkal nyugatra repülő madár a Földhöz viszonyítva 17,4 \(\displaystyle \frac{\rm km}{\rm h}\) sebességgel fog mozogni nyugat felé.


244 students sent a solution.
3 points:155 students.
2 points:56 students.
1 point:7 students.
0 point:17 students.
Unfair, not evaluated:9 solutionss.

Problems in Physics of KöMaL, October 2009