Two spherical cylinders with air, each having a volume V0 = 1.0 l, are connected by a tube of diameter d = 6 mm and length l = 1.0 m. The tube contains a drop of mercury, which at 0°C is located in the middle of the tube (Fig.) . How far will a drop of mercury move if balloon 1 is heated by 2°C and balloon 2 is cooled by 1°C? Neglect the expansion of the walls.

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