Mathematical and Physical Journal
for High Schools
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Problem P. 4077. (May 2008)

P. 4077. A 60-g and an 80-g ball are fixed to the ends of a 28-cm rod of negligible mass. The rod is balanced by a pivot such that it is horizontal and stays at rest. With what angular acceleration does it start to move, if the pivot is placed 2 cm closer to the heavier ball?

(4 pont)

Deadline expired on June 11, 2008.


92 students sent a solution.
4 points:58 students.
3 points:20 students.
2 points:9 students.
1 point:5 students.

Problems in Physics of KöMaL, May 2008