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1 markMechanical Properties of Materials

CAPE Physics Unit 1 · 2013 · Paper 2 · Question 6(b)(ii)

An aluminum cube, each side measuring 1 m, at sea level, lies on the sea floor at a depth of 2.5 km.

Determine the decrease in length (in mm) of any side of the cube resulting from this pressure, given that the Young's Modulus for aluminum is 69 GPa.

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Other parts of this question

  1. 6(a)With the aid of a diagram, derive the expression P = hρg at a depth, h, in a liquid of density, ρ.[5 marks]
  2. 6(b)(i)Determine the pressure exerted on the cube at this depth. [Assume that the density of sea water is constant and equal to 1.04 × 10³ kgm⁻³][5 marks]
  3. 6(c)(i)Explain what happens to the wire at points A and B.[5 marks]
  4. 6(c)(ii)Using the graph, determine the strain energy in the wire at point X.[1 mark]

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