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1 markHeat Transfer

CAPE Physics Unit 1 · 2010 · Paper 2 · Question 6(b)(ii)

A black woodstove has a total surface area of 4.6 m² and is made from cast iron 4.0 x 10⁻³ m thick. The interior wall is at 650 °C, the exterior wall is at 647 °C, and the surrounding air is at 30 °C. (Thermal conductivity of cast iron, k = 80.4 Wm⁻¹K⁻¹)

Calculate the net rate of heat loss by radiation from the stove, assuming it acts as a black body.

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Other parts of this question

  1. 6(a)(i)Explain in terms of the kinetic theory how this radiation is able to warm a distant cold body.[1 mark]
  2. 6(a)(ii)Explain this 'greenhouse effect'.[5 marks]
  3. 6(b)(i)Calculate the rate of the heat conduction through the stove wall.[1 mark]
  4. 6(b)(iii)Calculate the heat the stove loses by a combination of conduction and convection in the surrounding air. Explain your answer.[10 marks]

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