Chapter Chosen

Mechanical Properties of Fluids

Book Chosen

Physics Part II

Subject Chosen


Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
A big drop of water is sprayed into 1000 small droplets. Find the ratio of surface potential energy of drop to single droplet?


Radius of small droplet be 'r', 

Radius of big drop be 'R'. 

Volume of water will remain constant on splitting the drop into droplets. 


R= nr3

Here n = 1000, 

Therefpre, R = 10 r

Now, the surface of the potential energy of drop is, 

straight E subscript 1 space equals space 4 πR squared straight T

and space the space surface space potential space energy space of space droplet space is comma space

straight E subscript 2 space equals space 4 πr squared straight T

Therefore comma space the space ratio space of space the space surface
space potential space energy space of space drop space to space single space drop space is comma space

straight E subscript 1 over straight E subscript 2 space equals space straight R squared over straight r squared space equals space fraction numerator left parenthesis 10 space straight r right parenthesis squared over denominator straight r squared end fraction space equals space 100 over 1


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. 

What is fluid?

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


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.

What is hydrodynamics?

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

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

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