(a(i))[1]
Define stress for a wire.
(a(ii))[1]
Define strain, for a wire.
(b)
A wire with length $1.70\\,\\text{m}$ is suspended vertically from a fixed point, as shown in Fig. 4.1. Its cross-sectional area is $5.74 \\times 10^{-8}\\,\\text{m}^2$ and it is made from a material with a Young modulus of $1.60 \\times 10^{11}\\,\\text{Pa}$. A load of $25.0\\,\\text{N}$ is attached to the wire.
(b(i))[3]
Calculate the wire’s extension.
(b(ii))[3]
A second wire made from the same material carries the same load. It is twice as long as the first wire but has the same volume as it. State and explain how the extension of the second wire compares with that of the first wire.