Problem # p047

Conservation of energy

A well-insulated blender is filled with 0.8 kg of water at 20 °C. When the blender is turned on it consumes 100 W of power. Assuming that all this energy goes into the water, by how much has the water temperature risen after 1 minute of operation ? How long does it take to bring the water to the boiling point ( 100°C ). Assume that you need 4.18 kJ of energy to increase the temperature of 1 kg of water by 1 °C.