(a(i))[2]
From Fig. 3.1, determine the Young modulus for $P$.
(a(ii))[1]
On the line in Fig. 3.1, place a cross $(\times)$ to indicate the limit of proportionality. Name this point $Q$.
(b)[2]
State the conditions required for an object to be in equilibrium.
(c(i))[3]
Using moments about $A$, determine the tension in the wire.
(c(ii))[2]
The stress in the wire is $1.5 \times 10^{7}\,\text{Pa}$. Find the radius of the wire.
(c(iii))[2]
More items are placed on the shelf, so the stress in the wire doubles. The wire is made from the metal P in (a). Use Fig. 3.1 to state and explain whether the wire will act plastically or elastically when the stress doubles.