Question

It is possible to determine the rigidity modulus of
fluids only
Gases only
solids only
or all the above
​

Answer 1

Answer:

I don,t know sorry answer

Answer 2

It is possible to determine rigidity modulus only for solids. So option (C) is correct.

Explanation:

Modulus of Rigidity(Denoted by G) is defined as the measure of elastic shear stiffness of a material. In other words it is a measure of the rigidity of a material.

Mathematically it is defined as the ratio of  Shear stress/Shear strain

i.e.  G=$\tau _{{xy}}$/$\gamma _{xy}$

where

$\tau _{{xy}}=$ Shear stress and

$\gamma _{xy}$= Shear Strain

Now Coming back to our question, we need to explain for which state of matter it is possible to determine rigidity modulus.

Rigidity modulus is defined only for that state of matter which can sustain shear force i.e. the force which pushes the object in one specific direction and other part of the body in the opposite direction. This only occurs when we apply tangential stress to the object.

But Liquids and gasses i.e. all fluids can not sustain/possess Tangential stress. This means that Fluids can not sustain shear force.

Hence It is not possible to define Rigidity modulus for fluids i.e. for liquids and gasses.

There the option (C) solids only is correct.