(a)[3]
Show that the SI base units for power are $\text{kg m}^2 \text{s}^{-3}$.
(b)[4]
Determine the SI base units of $C$ for the thermal-energy flow rate $\frac{Q}{t}$ in a material, where $\frac{Q}{t} = \frac{CAT}{x}$, $A$ is the cross-sectional area of the material, $T$ is the temperature difference across the thickness of the material, $x$ is the thickness of the material, and $C$ is a constant.
(main)[2]
Use the data from Fig. 3.2 to show that the box's acceleration is $2.6\,\text{m s}^{-2}$.