Hooke's law defines:

If the temperature increases,the modulus of elasticity

Why is rubber used to make cycle seats instead of wood or iron?

One end of a uniform wire of length $L$ and weight $W$ is attached rigidly to a point in the roof,and a weight $W_1$ is suspended from its lower end. If $S$ is the area of cross-section of the wire,the stress in the wire at a height $3L/4$ from its lower end is

Pressure and stress have the same unit (and dimension),although they are not the same physical quantity. Why?

The breaking stress for a wire of radius $r$ of a given material is $F \ Nm^{-2}$. The breaking stress for a wire of the same material of radius $2r$ will be: