The specific heat capacity of water is 4200 J/kg/K. How long will it take to heat up 0.5 kg of water by 50K, assuming the water stays below
boiling point and that the heater is 100% efficient?
[express your answer in seconds to the nearest second]

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions