Задача id13091

One end of the tram line wire is under constant voltage V relative to ground. At what distance from this end of the line is a tram equipped with two identical motors located, and at what speed does it move if, when the motors are switched in series, the current in the line is equal to I1; when switched in parallel, it is equal to I2 and the speed of the tram does not change during such switching? The friction force applied to the wheels of the tram is equal to F, the resistance per unit length of the wire is p, the ohmic resistance of the winding of each motor is R,

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