ï»¿ Explain why a parachute is invariably used, while jumping from an aeroplane. from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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Explain why a parachute is invariably used, while jumping from an aeroplane.

The parachute during descending, through air experiences very large viscous force due to large structure. The large structure of the parachute leads to a greater air resistance and hence a tendency to reach a slower terminal velocity. Therefore a person landing on ground will get very little hurt.
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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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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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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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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 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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