The substances having a very short plastic region are

The length of an elastic string is $a$ metres when the longitudinal tension is $4 \ N$ and $b$ metres when the longitudinal tension is $5 \ N$. The length of the string in metres when the longitudinal tension is $9 \ N$ is

The length of a metal wire is $l_1$ when the tension in it is $T_1$,and it is $l_2$ when the tension is $T_2$. The unstretched length of the wire is

When a heavy weight is suspended from a metal wire and then removed,the wire does not regain its original length. Why?

What is the difference between a rigid body and a solid body?

Which of the following is an amorphous solid?