A coin collector owns 19 identical coins, as illustrated in Fig. 2.1. Fig. 2.2 shows one coin in the collector’s hand.
(a)[3]
Describe how she can use the 30 cm ruler to measure the thickness of one coin accurately. You may add a diagram if you want.
(b(i))[3]
Show that the density of this coin is about $10\,\text{g cm}^{-3}$.
(b(ii))[1]
The density of liquid mercury is $13.6\,\text{g cm}^{-3}$. State and explain whether the coin in (b)(i) floats on liquid mercury.
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