ï»¿ State Stoke’s law. from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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State Stoke’s law.

Stoke’s law states that the viscous force acting on a spherical body of radius 'r' moving with velocity 'v' in viscous media of viscosity 'η' is given by,

F= – 6πηrv.

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Why solids have definite shape while liquids do not have definite shape?

Solids: Intermolecular forces are very strong and thermal agitations are not sufficiently strong to separate the molecules from their mean position. Solids are rigid and hence they have definite shapes.
Liquids: In liquids intermolecular forces are not sufficiently strong to hold the molecules at definite sites, as a result they move freely within the bulk of liquid, therefore, do not possess definite shapes. Liquids take the same shape as that of the container.
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What is hydrostatics?

Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. The study of fluids at rest or objects placed at rest in fluids is hydrostatics.
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What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids.
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What is fluid?

Any material that can flow is a fluid. Liquids and gases are examples of fluid.

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Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law.
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