Advertisements
Advertisements
प्रश्न
State Stoke’s law and give two factors affecting angle of contact.
उत्तर
Statement: The viscous force acting on a small sphere falling through a medium is directly proportional to the radius (r) of the sphere, its velocity (v) through fluid, and coefficient of viscosity (η) of the fluid.
Two factors affecting the angle of contact:
- The nature of the liquid and the solid in contact.
- Impurities present in the liquid change the angle of contact.
संबंधित प्रश्न
Derive an expression for the terminal velocity of the sphere falling under gravity through a viscous medium.
A rain drop of radius 0.4 mm has a terminal velocity in air 4 m/s. If the coefficient of viscosity of air is 1.8 x 10-4 poise, the viscous drag on the rain drop will be ____________.
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) ____________.
The viscous force acting on a small spherical rain drop falling through stormy air cannot be calculated using Stoke's law because ____________.
What will be the approximate terminal velocity of a rain drop of diameter 1.2 x l0-3 m, when density of rainwater ≈ l03 kgm-3 and the co-efficient of viscosity of air ≈ 1.8 x l 0-5 Nsm-2?
State Stokes' law and an expression for the magnitude of the viscous force.
