A crane lifts a 2.25 x 10^3 N bucket containing 1.15m^3 of soil (density 2.00 x 10^3 kg/m^3) to a height of 7.50 m Calculate the work the crane performs.
Weight of soil1.15 x 2000 x 9.81 22563N, so weight of bucket + soil 22563+225024813NSo work done 24813 x 7.501 860 975 joulesThat's about half a kilowatt hour, so if the crane was electric, it would use about 10 US cents worth of electricity.
