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2 marksThermal Properties

CAPE Physics Unit 1 · 2003 · Paper 2 · Question 3(a)

A graph on page 9 shows the temperature variation with time for 1.1 kg of water heated in a kettle.

Explain why the graph for the first 275 s is NOT a straight line.

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Other parts of this question

  1. 3(b)The power of the heating element in the kettle is 1.6 kW. If the heat losses are ignored, what value would the data give for the specific heat capacity of…[3 marks]
  2. 3(c)The accepted value for the specific heat capacity of water is 4 200 J kg^-1 K^-1. Suggest TWO ways of improving the accuracy of the value determined in (b)…[2 marks]
  3. 3(d)Describe how the specific latent heat of vaporization could be determined using this same apparatus.[3 marks]

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