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14.2 Specific heat capacity and latent heat

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Question 4

A 0.36 kg sample of a pure material is entirely liquid at its freezing point. A cooling unit then removes energy from the sample at a constant rate of 40 W for 20 minutes20\ \mathrm{minutes}20 minutes. All of the energy removed is released by the material as it freezes. The specific latent heat of fusion of the material is 2.0 × 105 J/kg.

Calculate the mass of the sample that is still liquid at the end of the 20 minutes20\ \mathrm{minutes}20 minutes.

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Markscheme

14.2 Specific heat capacity and latent heat Questions

  1. GCSE
  2. /Physics
  3. /14.2 Specific heat capacity and latent heat

110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.

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