(a)[1]
Suggest one difficulty the student finds when moulding the clay into a cube.
(b(i))[1]
On Fig. 3.1, determine the length $d$ of one side of the cube. $d = \ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\text{cm}$
(b(ii))[1]
Calculate the volume $V$ of the modelling clay from the equation: $V = d^3$ $V = \ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\text{cm}^3$
(b(iii))[2]
Calculate the density $\rho$ of the modelling clay using the equation: $\rho = \frac{m}{V}$ State the unit of your answer. $\rho = \ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots$ unit $\ldots\ldots\ldots\ldots\ldots\ldots$