Mathematical and Physical Journal
for High Schools
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Problem P. 4236. (March 2010)

P. 4236. A vertical rod of mass 4 kg is hanging on a rope and a 3-kg cat is grasping the bottom end of the rod. The rope is cut off and the frightened cat begins to run up on the rod. While the rod is falling vertically, the cat remains at the same height, with respect to the ground. Calculate the acceleration of the rod.

(4 pont)

Deadline expired on April 12, 2010.


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

Megoldás. A rúd gyorsulása: \(\displaystyle a=7g/4\approx17,\!2\) \(\displaystyle m/s^2\).


Statistics:

135 students sent a solution.
4 points:110 students.
3 points:7 students.
2 points:6 students.
1 point:6 students.
0 point:1 student.
Unfair, not evaluated:5 solutions.

Problems in Physics of KöMaL, March 2010