A hot-water tank is wrapped in an insulating jacket. The jacket is replaced by a thicker jacket made from the same material. In each case the water starts at the same temperature and is not heated. Which quantity is smaller when the thicker jacket is fitted?
the energy in the thermal store of the water after one hour
the thermal conductivity of the material used for the jacket
the rate of energy transfer from the water to the surroundings
the time taken for the temperature of the water to fall by 10 °C
104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.