Elastic Behaviour of Solids

The graph is drawn between the applied force $F$ and the strain $x$ for a thin uniform wire. In which part the wire behaves as a liquid?

The length of a copper wire is $10 \mathrm{m}$ and its mass per unit metre is $50 \mathrm{g}$. Determine the increase in its length when a weight of $2 \mathrm{kg}$ is suspended from it. Young's modulus of copper =$1.2\times {10}^{11} \mathrm{N} {\mathrm{m}}^{- 2}$, density of copper = $8.9\times {10}^3 \mathrm{kg} {\mathrm{m}}^{-3}$and $g=9.8 m s{ }^{-2}$

What is the effect of temperature on elasticity?

Which is more elastic, steel or rubber? Why?

Explain elasticity using intermolecular force.

A thin uniform metallic rod of mass $m$, length $L$, Young modulus of elasticity $Y$ and cross-sectional area $A$ is rotated by angular velocity $\omega$ about extreme end $A{A}^{\text{'}}$. Consider shaded region of the rod, at midpoint of rod. What will be normal stress in $\mathrm{N} {\mathrm{m}}^{-2}$ on the shaded region? (Take the value of $\frac{M{\omega }^2{L}^2{\cos }^2\theta }{A}=10 \mathrm{N} {\mathrm{m}}^{-2}$ ).

Why does a rubber band become loose after repeated use?

What do you mean by plastic deformation?

The elastic limit for a gas,

What is elastic limit?

When is a body said to be perfectly elastic

A wire of length $\mathrm{L}$ and area of cross-section $\mathrm{A}$ is made of material of Young's modulus $\mathrm{Y}$. If the wire is stretched by the amount $\mathrm{x}$, the work done is

What is the formula of restoring force?

Explain how the knowledge of the elastic properties of materials helps in engineering and structural designs.

Differentiate between perfectly elastic body and perfectly plastic body. Give one example for each.

What is Yield Point in a stress strain graph ?

Which term is not related to the elasticity.

Resistance to elastic deformation of a material is measured by:

How the strengths of the two materials can be compared?

Define a Perfectly plastic body.