Question

define: (i) bulk modulus (ii)modulus of rigidity (iii) Poisson's ratio .

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Answer 1

(1)- Substance ka ek maap hai ki substance compression ke liye kitna resistance hai. Formula-pressure applied / fractional change in volume

(2)-Modulus of rigidity, jise sheer modulus bhi kaha jaata hai, ko material property ke roop mein define kiya jaata hai jisme sheer stress divided by sheer strain ke value ke equal hota hai.

(3)-ratio of transverse contraction strain to longitudinal extension strain in the direction of stretching force ko hum Poisson's ratio bolte h

Thoda thoda sa eng. h uske liye maaf kre

Answer 2

Bulk modulus -: the relative change in the volume of a body produced by a unit compressive or tensile stress acting uniformly over its surface.

modulus of rigidity -: In materials science, shear modulus or modulus of rigidity, denoted by G, or sometimes S or μ, is defined as the ratio of shear stress to the shear strain: where = shear stress is the force which acts is the area on which the force acts = shear strain. 

Poisson's ratio -: the ratio of the proportional decrease in a lateral measurement to the proportional increase in length in a sample of material that is elastically stretched