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1 markHeat Transfer

CAPE Physics Unit 1 · 2005 · Paper 2 · Question 8(a)(ii)

When measuring the thermal conductivity of a sample of metal in the form of a cylinder it is usual for the cylinder to be about 20 cm long with a diameter of about 3 cm. Outline THREE reasons why these dimensions are suitable.

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  1. 8(a)(i)Write the formula for linear heat flow by conduction explaining EACH of the terms in the equation carefully.[1 mark]
  2. 8(a)(iii)What is the MAIN potential source of error in an experiment like this and how is it overcome?[8 marks]
  3. 8(b)(i)Sketch a graph to show how the temperature varies across the wall of the box.[1 mark]
  4. 8(b)(ii)The thermal conductivity of plywood is 0.24 W m⁻¹ K⁻¹ whilst that of the plastic foam is 0.012 W m⁻¹ K⁻¹. Calculate the thickness of a piece of plywood which…[1 mark]
  5. 8(b)(iii)Using this equivalent thickness, or otherwise, find the rate of conduction of heat through a rectangular wall of the box which is 0.6 m by 0.4 m and deduce the…[12 marks]

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