Question

When a solid ball of volume V is released in a viscous liquid it experiences a viscous force F. If the solid ball of the same material of volume V/2 is released in the liquid then the viscous force will be (where `eta` = coefficient of viscosity) ____________.

विकल्प

• `eta  "F"//2`

• F/2

• 2 F

• `2 eta  "F"`

Answer 1

When a solid ball of volume V is released in a viscous liquid it experiences a viscous force F. If the solid ball of the same material of volume V/2 is released in the liquid then the viscous force will be F/2.

Explanation:

`"F" prop "r"^3 prop "V"`

As volume becomes doubled, F changes to F/2.