Suppose that the average u.s. household uses 10600 kwh (kilowatt-hours) of energy in a year. use 1 y = 365 d and g = 9.80 m/s². into the air, how long would it take? car: s Using the same rate of energy consumption, how long would it take to lift a loaded Boeing 747 airplane, with a mass of 4.05 × 10 5 kg , to a cruising altitude of 9.67 km ? airplane: