· Collins p.106 Q.1-3. (Table of densities below)
1) Objects that will sink: wood in oil (if the wood is softwood or things like cork)
Silver in air, Gold in mercury
Brick = 0.2 x 0.65 x 0.9 = 0.117
Mass = 22.N à 2.2 kg
MASS = 2.2kg
VOLUME = 0.117 cm3
DENSITY = mass / volume
= 2.2 / 0.117
= 18.8g/cm3
3) 1.93 kg à 1930 g
Density of gold = 19.3 g/cm3 (chart above)
If it was pure gold, the density 19.3 = mass 1930 / volume 100
So the new water level should be 900 cm3
If the jeweller has cheated, the water level would be greater
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