Mechanical Properties of Fluids
Spherical balls of radius R are falling in a viscous fluid of velocity v. The retarding viscous force acting on the spherical ball is
- directly proportional to R but inversely proportional to v.
- directly proportional to both radius R and velocity v.
- inversely proportional to both radius R and velocity v
- 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