(a)[1]
Define the term Young modulus.
(b(i))[1]
Determine the wire’s unstretched length.
(b)[1]
A uniform wire is hung from a fixed support. Masses are attached to its free end, as shown in Fig. 6.1. Fig. 6.2 shows how the wire’s length $l$ changes with the force $F$ applied by the masses. The wire has a cross-sectional area of $0.95\,\text{mm}^2$. (i) Determine the unstretched length of the wire.
(b(ii))[3]
When an applied force $F$ of $30\,\text{N}$ is used, determine: • the stress in the wire • the strain in the wire.