Problem P. 4236. (March 2010)
P. 4236. A vertical rod of mass 4 kg is hanging on a rope and a 3kg 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 12 April 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. 
