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JEE Main Physics question

PhysicsMechanical Properties of FluidsJEE Main

drops of water, each of radius 2 mm, fall through air at a terminal velocity of 8 cm/s. If they coalesce to form a single drop, the terminal velocity of the combined drop is 32 cm/s. The value of is

Answer: 8

Solution

Terminal velocity (Stokes' law), and volume conservation on coalescence gives . So

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Question ID VK-155036