Topic 5 - 5.2 Harder Questions

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Collins p.106 Q.1-3. (Table of densities below)

Q1)

Wood in oil = It depends on what sample of the material you choose.

Wood in mercury = Float

Plastic in oil = Sink

Steel in mercury = Float

Silver in air = Sink

Gold in mercury = Sink

Helium balloon in air = Float

Q2) 

Brick dimensions = 0.2m x 0.09m x 0.065m

Weight of brick = 2.22kg 

Density = mass / volume = 2.22 / 0.00117 = 1,897kg/m^3

Q3)

If the crown is pure gold, the new water level would be 800 + 100 = 900 cm^3. This will be because the volume of the gold would be m / Density, V = 1930 / 1.93, V = 100 cm^3. The water level would not be as much because silver is less dense than gold. Therefore, the volume would be less.