Spherical balls of radius R are falling in a viscous fluid of velo | Filo
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Class 11

Physics

Mechanics

Mechanical Properties of Fluids

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Spherical balls of radius R are falling in a viscous fluid of velocity v. The retarding viscous force acting on the spherical ball is

  1. directly proportional to R but inversely proportional to v.
  2. directly proportional to both radius R and velocity v.
  3. inversely proportional to both radius R and velocity v
  4. inversely proportional to R but directly proportional to velocity v
Correct Answer: Option(b)
Solution: Retarding force acting on a ball falling into a viscous fluid
Where Radius of ball 
velocity of ball 
coefficient of viscosity
and or in words,
Retarding force is directly proportional to both and
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