Problem P. 4556. (September 2013)
P. 4556. There is a spring of spring constant D=240 N/m between two easily rolling carts of masses m1=2 kg and m2=3 kg. The spring is kept at a compressed position by a thin thread and the compression of the spring is =15 cm. The common speed of the two carts is v=2 m/s. What will their velocities be after the break of the thread?
(4 pont)
Deadline expired on October 10, 2013.
Sorry, the solution is available only in Hungarian. Google translation
Megoldásvázlat. A tömegközépponti rendszerben a kiskocsik \(\displaystyle u_1=1{,}27~\)m/s és \(\displaystyle u_2=0{,}85~\)m/s sebességgel lökődnek szét. A fonál elszakadása után a kiskocsik (az eredeti haladási iránytól függően)
\(\displaystyle v_1=v+u_1=3{,}27~{\rm m/s}; \qquad v_2=v-u_2=1{,}15~{\rm m/s},\)
vagy
\(\displaystyle v_1=v-u_1=0{,}73~{\rm m/s}; \qquad v_2=v+u_2=2{,}85~{\rm m/s}\)
sebességgel fognak mozogni.
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137 students sent a solution. 4 points: 55 students. 3 points: 22 students. 2 points: 11 students. 1 point: 23 students. 0 point: 26 students.
Problems in Physics of KöMaL, September 2013