An electric heater transfers 18 000 J of energy to a 2.0 kg block of iron. The temperature of the block rises by 20 ∘C20\ ^\circ\text{C}20 ∘C. What is the specific heat capacity of the iron?
180 J/kg ∘C180\ \text{J/kg}\ ^\circ\text{C}180 J/kg ∘C
360 J/kg ∘C360\ \text{J/kg}\ ^\circ\text{C}360 J/kg ∘C
900 J/kg ∘C900\ \text{J/kg}\ ^\circ\text{C}900 J/kg ∘C
450 J/kg ∘C450\ \text{J/kg}\ ^\circ\text{C}450 J/kg ∘C
40 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.