(a)[2]
Mass, length and time are three SI base quantities. Name two more SI base quantities.
(b(i))[2]
Find the weight of the tyre.
(b(ii).1)[2]
A wire has cross-sectional area $7.5\,\text{mm}^2$ and is made of a metal with Young modulus $2.1 \times 10^{11}\,\text{Pa}$. The wire obeys Hooke’s law. Calculate, for the wire, the stress.
(b(ii).2)[2]
A wire has cross-sectional area $7.5\,\text{mm}^2$ and is made of a metal with Young modulus $2.1 \times 10^{11}\,\text{Pa}$. The wire obeys Hooke’s law. Calculate, for the wire, the strain.