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Mechanical Properties of Fluids

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Physics Part II

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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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 Fill in the blanks using the words from the list appended with each statement:

For a fluid in steady flow, the increase in flow speed at a constriction follows from .............while the decrease of pressure there follows from ................. (conservation of mass/Bernoulli's equation).

Conservation of mass,

Bernoulli's equation.

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Explain why:
(b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km.


Near the sea level, density of air is the maximum. With increase in height from the surface, density of air decreases. At a height of about 6 km, density decreases to nearly half of its value at the sea level. Atmospheric pressure is proportional to density. Hence, at a height of 6 km from the surface, it decreases to nearly half of its value at the sea level.
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Fill in the blanks using the words from the list appended with each statement:

For solids with elastic modulus of rigidity, the shearing force is proportional to ............ while for fluids it is proportional to ............... (shear strain/rate of shear strain).

Shear strain
, rate of shear strain.
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Fill in the blanks using the words from the list appended with each statement:

For the model of a plane in a wind tunnel turbulence occurs at a .................. speed than the critical speed for turbulence for an actual plane. (greater/smaller)

Greater.
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Surface tension of liquids generally ....... with the temperature. (increases/decreases). 

Decreases.
209 Views