Mathematical and Physical Journal
for High Schools
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Problem P. 4266. (September 2010)

P. 4266. The pulling force that an electric engine can exert when its speed is 57.6 km/h is 310 kN. The voltage is 3.6 kV, and the current in all the eight electric motors is 230 A. Determine the efficiency of the engine.

(3 pont)

Deadline expired on October 11, 2010.

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

Megoldás. 75% a hatásfok.


213 students sent a solution.
4 points:Magyari Sarolt.
3 points:162 students.
2 points:23 students.
1 point:16 students.
0 point:1 student.
Unfair, not evaluated:10 solutions.

Problems in Physics of KöMaL, September 2010