A plastic kettle is filled with 0.70 kg of water at a temperature of 25∘C25^\circ\text{C}25∘C. A 2.5 kW electric heater is used to heat the water for a time of 4.0 minutes4.0\text{ minutes}4.0 minutes.
Calculate the total energy supplied by the heater during the time of 4.0 minutes4.0\text{ minutes}4.0 minutes.
The specific heat capacity of water is 4200 J kg-1 K-1 and the specific latent heat of vaporisation of water is 2.3 × 106 J kg-1. The boiling point of water is 100∘C100^\circ\text{C}100∘C.
Calculate the mass of water remaining in the kettle after 4.0 minutes4.0\text{ minutes}4.0 minutes. Assume that all the thermal energy from the heater is transferred to the water.
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.