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4 marksHeat Transfer

CAPE Physics Unit 1 · May/June 2023 · Paper 2 · Question 3(d)(i)

Figure 9 shows a furnace wall constructed from two types of brick of equal thickness, with inner layer conductivity k_1 and outer layer k_2, and temperature drops dθ_1 and dθ_2 respectively.

Show that the ratio of the temperature drop across each of the layers is inversely proportional to the ratio of the thermal conductivities of the layers, given that both layers are of the same thickness.

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Other parts of this question

  1. 3(a)(i)Outline TWO differences between boiling and evaporation.[4 marks]
  2. 3(a)(ii)Explain what is meant by the 'specific latent heat of fusion' of a substance.[2 marks]
  3. 3(b)(i)On the axes provided in Figure 7, plot a graph of temperature, θ, versus time, t. Use the graph to determine the melting point of Y.[4 marks]
  4. 3(b)(ii)For the substance Y in (b), calculate the specific latent heat of fusion if 200 g of Y is heated at a steady rate of 500 W.[5 marks]
  5. 3(c)(i)Calculate the temperature change of the water.[3 marks]
  6. 3(c)(ii)An unknown liquid is then passed through the same calorimeter at a flow rate of 120 g per minute. To obtain the same temperature change, the electrical supply…[4 marks]
  7. 3(c)(iii)State TWO advantages and ONE disadvantage of using the continuous flow method to determine the specific heat capacity of a liquid.[3 marks]
  8. 3(d)(ii)State ONE application of thermal insulation, other than the application described in (d).[1 mark]

More practice: the rest of this paper · more Heat Transfer questions · all CAPE Physics Unit 1 past papers