A thread is evenly wound onto the horizontal shaft of the motor, on which a load weighing P = 800 G is suspended. The motor is powered by a battery of batteries with electric power. d.s. E = 12 V and internal resistance r1 = 0.4 ohm. The motor circuit resistance is r2 = 3 ohms. How many revolutions per second does the armature make if a current I = 3.3 A flows through the motor windings? Shaft radius a = 0.5 cm.

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