If Poission's ratio `sigma` is `-(1)/(2)` for a material, then the material is

A 15 kg mass is attached to one end of a copper wire 2m ling and 2mm in diameter. Calculate the lateral compression produced in it. Poission's ratio is 0.30 and ypung's modulus of the material of the wire is 12 xx 10^(10) Nm^(-2) . Use , g=10ms^(-2) .

A: Lateral strain is directly proportional to the longitudinal strain within the elastic limit. R:Poission ratio for a given material at a constant temperature is constant.

A: Lateral strain is directly proportional to the longitudinal strain within the elastic limit. R:Poission ratio for a given material at a constant temperature is constant.

The Young's modulus of a material is 10^(11)N//m^(2) and its Poisson's ratio is 0.2 . The modulus of rigidity of the material is

The longitudinal strain in a metal bar is 0.05. If the Poission.s ratio for the metal is 0.25, the lateral strain is

Define Poisson's ratio. The poisson's ratio of a material is sigma . If a longitudinal strain of a wire made of thin material be a, show that its volume strain is (1-2sigma)a

If the speed of light in material A is 1.25 times its speed in material B, then the ratio of the refractive indices of these materials is

When the length of a wire is increased by 5%, its radius decreases by 1%. The Poission's ratio for the material of the wire is