Question

Question 20 of 22 > Suppose that the average U.S. household uses 15600 kWh (kilowatt-hours) of energy in a year. If the average rate of energy consumed by the house was instead diverted to lift a 2240 kg car 11.3 m into the air, how long would it take? car: Using the same rate of energy consumption, how long would it take to lift a loaded Boeing 747 airplane, with a mass of 4.10 x 10 kg, to a cruising altitude of 9.42 km? airplane:

Answer 1

- Total energy consumed in a year is E = 156000Wh. - Average rate of energy consumed, - Pa = 1 15600X1000X 60X40 watte, 365X24 X60x60 ii Ps 1781 Watts st k 248057.6 1781 - Energy yeained by car when lifted to 11.3m is Eczmghe 2240X9.8x11.3 ) Ec= 2480576 I si Time talcen, to be = 24,00 ta 139 $1 of Boeing 747 is to be lifted then energy gerned is Esa mg ho = 4620 x 105 x9.84 x 9.42X103 J i time,t = Ep 4.10 X10S x9.4 XI-42 x1024 - 1781 t = 2127x1074