A block is attached to a vertical spring with a spring constant 800 N/m. The spring stretches 5 cm down and reaches equilibrium. How much elastic potential energy is stored in the system?

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