Problem P. 4208. (December 2009)
P. 4208. Three marbles of mass 4m, m and 3m can slide without friction along a horizontal rod. (There are holes in the balls.) At a certain moment the middle marble is given an initial speed of v0=5 m/s towards the right. After the totally elastic collisions determine the
a) velocities of the marbles;
b) the ratio of the kinetic energies of the marbles.
(4 pont)
Deadline expired on January 11, 2010.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. \(\displaystyle a)\) A bal oldali test balra halad 1 m/s, a középső jobbra 1,5 m/s sebességgel, a jobb oldali jobbra 2,5 m/s sebességgel.
\(\displaystyle b)\) A mozgási energiák aránya: \(\displaystyle E_{4m}:E_{m}:E_{3m}= 14:9:75\).
Statistics:
156 students sent a solution. 4 points: 122 students. 3 points: 8 students. 2 points: 7 students. 1 point: 8 students. 0 point: 9 students. Unfair, not evaluated: 2 solutionss.
Problems in Physics of KöMaL, December 2009