(a(i))[1]
Define what stress is.
(a(ii))[1]
Define what strain is.
(b)
The Young modulus of the metal in a wire is $0.17\,\text{TPa}$. The wire has a cross-sectional area of $0.18\,\text{mm}^2$. A force $F$ is applied to the wire. As a result, its length increases by $0.095\%.$
(b(i))[4]
Calculate the stress in the wire.
(b(ii))[2]
Calculate the force $F$.