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MHT CET202123 Sep 2021Evening ShiftPhysicsMechanical Properties of FluidsActual

The speed of a ball of radius 2 ~cm in a viscous liquid is 20 ~cm / s . What will be the speed of a ball of radius 1 ~cm in same liquid?

Options

  1. A10 ~cm / s
  2. B4 ~cm / s
  3. C5 ~cm / s
  4. D8 ~cm / s

Correct answer

C. 5 ~cm / s

Step-by-step solution

Terminal velocity V r ^2 aligned & V ₂ ~V ₁ = ( r ₂ r ₁ )^2= ( 1 2 )^2= 1 4 & V ₂= V ₁ 4 = 20 4 =5 ~cm / s aligned

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