In an investigation of insulating materials, a student measured the temperature of a sample of water as it cooled. For one type of insulating jacket, the temperature of the water decreased from 80.0∘C80.0^\circ\text{C}80.0∘C to 55.0∘C55.0^\circ\text{C}55.0∘C. The energy transferred from the water to the surroundings was 18.9 kJ18.9\text{ kJ}18.9 kJ. The specific heat capacity of water is 4200 J/kg ∘C4200\text{ J/kg }^\circ\text{C}4200 J/kg ∘C. Calculate the mass of water used in the investigation.
37 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.