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2.2.2a Internal energy and temperature

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Question 55
a.

A solar water heater receives energy from solar radiation at a rate of 4.2 kW4.2\text{ kW}4.2 kW.

  • Thermal energy is transferred from the solar panel to water with an efficiency of 30%30\%30%.
  • Cold water of mass 18 kg18\text{ kg}18 kg enters the solar water heater every hour.
  • The specific heat capacity of water is 4200 J/(kg ∘C)4200\text{ J}/(\text{kg }^\circ\text{C})4200 J/(kg ∘C).

Calculate the temperature increase of the water.

temperature increase = …………………………∘C\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots ^\circ\text{C}…………………………∘C

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b.

State and explain one advantage and one disadvantage of heating the water using a solar water heater compared with heating the water in a gas-fired boiler.

advantage: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

explanation: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

disadvantage: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

explanation: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

[4]
Markscheme

2.2.2a Internal energy and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2.2a Internal energy and temperature

119 exam-style questions on CIE IGCSE Physics 2.2.2a Internal energy and temperature. Each one has a worked solution and a mark scheme showing where the marks go.

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