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The particle model

The particle model

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Question 13

An aerospace engineer is testing different materials to build protective cladding for an autonomous underwater vehicle (AUV).

Each cladding tile is manufactured as a uniform rectangular block with dimensions of 2.5 cm×6.0 cm×10.0 cm2.5\text{ cm} \times 6.0\text{ cm} \times 10.0\text{ cm}2.5 cm×6.0 cm×10.0 cm.

a.

Calculate the volume of one cladding tile.

[1]
b.

The table below shows the density of four candidate alloys:

MaterialDensity (kg/m3\text{kg/m}^3kg/m3)
Alloy Alpha920
Alloy Beta780
Alloy Gamma1140
Alloy Delta990

Seawater has a density of 1025 kg/m3. Identify which of the alloys will sink in seawater and explain why.

[2]
c.

The engineer wants to choose an alloy to construct a lightweight buoyancy aid that sits as high as possible in the seawater. Suggest which alloy they should use, and explain your choice.

[2]
d.

Which two microscopic properties of a substance directly determine its macroscopic density?

  • Option 1: The average speed at which the particles vibrate or move
  • Option 2: The chemical reactivity of the constituent elements
  • Option 3: The mass of the individual atoms or molecules
  • Option 4: The arrangement and spacing of the particles
  • Option 5: The total thermal energy stored by the substance
[2]
Markscheme

The particle model Questions

  1. GCSE
  2. /Physics
  3. /The particle model

29 exam-style questions on OCR GCSE Physics The particle model. Each one has a worked solution and a mark scheme showing where the marks go.

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