## AQA GCSE Density

**Practice Questio****ns**

1.A small gemstone has a mass of 60g and a volume of 1.5 x 10^{-2} m^{3}. Calculate the density in kg/m^{3}

Density = mass/volume

60g = 0.06kg

Density = 0.06/1.5 x 10^{-2}

Density = 4 kg/m^{3}

2.Calculate the mass of a sphere which has a volume of 9 x 10^{-2 }m^{3} and density of 3.2 x 10^{-3 }kg/m^{3}.

Density = mass/volume

Mass = Density x volume

Mass = 3.2 x 10^{-3} x 9 x 10^{-2}

Mass = 2.9 x 10^{-4}kg

3. Use the image below of a roll of plastic film to help you to answer the following question.

The film has a density of 3000 kg/m^{3} and mass of 20kg. If the film is uncoiled and laid flat it has a length of 3m x 1m. Calculate the thickness of the film.

Density = mass/volume

Volume = mass/density

Volume = 20/3000 = 6.67 x 10^{-3} m^{3}

When the object is laid flat and uncoiled it will exist as a cuboid

Volume = length x width x thickness

6.67 x 10^{-3} m^{3} = 3m x 1m x thickness

Thickness = 6.67 x 10^{-3}/(3 x 1)

Thickness = 2.22 x 10^{-3}m

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