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P. 4457. A one end of a thread of length  is tied to a small iron ball, whilst the other end is fixed at a height of  above a tabletop. The ball is displaced such that the thread is horizontal and is kept at this position by an electromagnet. At a height of  above the tabletop another small iron ball, similar to the one at the end of the thread, is also kept by an electromagnet. The two electromagnets release the balls at the same moment. The two balls begin to move at the same instant.

Which one reaches the tabletop first?

(4 points)

Deadline expired on 10 October 2012.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldásvázlat. A szabadon eső test ér le hamarabb, hiszen az ingatest függőleges irányú gyorsulása a fonálerő miatt mindvégig g-nél kisebb.

Statistics on problem P. 4457.
 238 students sent a solution. 4 points: 92 students. 3 points: 52 students. 2 points: 51 students. 1 point: 33 students. 0 point: 10 students.

• Problems in Physics of KöMaL, September 2012

•  Támogatóink: Morgan Stanley