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4 marksHeat Transfer

CAPE Physics Unit 1 · 2008 · Paper 2 · Question 6(b)

A packer enters a cold room at -5 °C from outside at 30 °C. The man's surface area is about 2 m².

Estimate the net rate of heat loss from his body after just entering the room.

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Other parts of this question

  1. 6(a)(i)Write a formula relating P to the inside and outside temperatures of the material, θ₁ and θ₂, and the thickness, x.[1 mark]
  2. 6(a)(ii)Use the graph to find the rate of flow of thermal energy when x = 2.5 cm and when x = 4.5 cm.[5 marks]
  3. 6(a)(iii)Use the gradient of the graph to find the thermal conductivity of the material.[3 marks]
  4. 6(a)(iv)Sketch the graph which would have been obtained if P were plotted against x instead of 1/x.[2 marks]

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