Mathematical and Physical Journal
for High Schools
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# Problem P. 4510. (February 2013)

P. 4510. At the end of an initially vertical, hinged rod of negligible mass there is a small heavy sphere. The rod is displaced from its unstable equilibrium position. What is the angular displacement of the rod at the moment when there is no force exerted on the rod?

(4 pont)

Deadline expired on March 11, 2013.

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

Megoldásvázlat. $\displaystyle \arccos\frac{2}{3}=48{,}2^\circ$-nál.

### Statistics:

 106 students sent a solution. 4 points: 72 students. 3 points: 20 students. 2 points: 1 student. 1 point: 3 students. 0 point: 9 students. Unfair, not evaluated: 1 solution.

Problems in Physics of KöMaL, February 2013