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KCET2011PhysicsMechanical Properties of Fluids

Eight equal drops of water are falling through air with a steady velocity of 10 ~cm ~s ⁻¹ . If the drops combine to form a single drop big in size, then the terminal velocity of this big drop is

Options

  1. A40 cms ⁻¹
  2. B10 cms ⁻¹
  3. C30 cms ⁻¹
  4. D80 cms ⁻¹

Correct answer

A. 40 cms ⁻¹

Step-by-step solution

Here, aligned v₁ v₂ &= r₁² 8^ 2 / 3 r² 10 v₂ &= 1 4 v₂ &=40 ~cm / s aligned

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