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6 marksTransfer of Thermal Energy

CSEC Physics · January 2010 · Paper 2 · Question 4(a)

A young student wants to keep her home-cooked meal warm using a vacuum flask, similar to the one shown in Figure 3.

Using the information in Figure 3, explain how the home-cooked meal is kept warm.

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Other parts of this question

  1. 4(b)(i)Calculate the energy in kWh collected by the absorber per day.[2 marks]
  2. 4(b)(ii)Calculate how much energy per day can be used to heat water if the collector emits 50% of the heat energy it receives from the atmosphere.[2 marks]
  3. 4(b)(iii)How much energy per day is now available to heat the water?[2 marks]
  4. 4(b)(iv)What mass of water can the glazed collector heat from 25°C to 55°C during the day?[3 marks]

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