When a mass is suspended on a metallic wire, the length of the wire increases slightly. Name and state the law that relates to the restoring force developed in the wire and its deformation.

When a mass is suspended on a metallic wire, the length of the wire increases slightly. If the Young's moduli of iron and glass are 190 xx 10^9 Nm^-2 and 65 xx 10^9 Nm^-2 respectively, which is more elastic ?Justify your answer.

A metallic wire is stretched so that its length increases by 0.2% . Calculate the percentage change in resistance.

We have common experience that a thin thread breaks if pulled at its ends. Also a thin metalic wire, when pulled at the ends elongates and then contracts, when released. A lift is tied with thick iron wires and its mass is 1000kg . What should be the minimum diameter of the wire if the maximum acceleration of the lift is 1.2m/s^2 and maximum safe stress of the wire is 1.4xx10^8N/m^2 (g= 9.8m/s^2 )