An energy-efficient water heater draws 4 amps in a 220-volt circuit. it costs $75 more that a standard water heater that draws 18 amps in a standard 115-volt circuit. if electricity costs 10 cents per kilowatt-hour, how long would you have to run the efficient water heater to recoup the difference in price? show your calculations.

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.