An elevator in a building can carry a maximum of 10 persons, with the average mass of each person being 68 kg. The mass of the elevator itself is 920 kg and it moves with a constant speed of $3 \mathrm {~m} / \mathrm { s }$. The frictional force opposing the motion is 6000 N. If the elevator is moving up with its full capacity, the power delivered by the motor to the elevator ($\mathrm { g } = 10 \mathrm {~m} / \mathrm { s } ^ { 2 }$) must be at least: (1) 56300 W (2) 62360 W (3) 48000 W (4) 66000 W
An elevator in a building can carry a maximum of 10 persons, with the average mass of each person being 68 kg. The mass of the elevator itself is 920 kg and it moves with a constant speed of $3 \mathrm {~m} / \mathrm { s }$. The frictional force opposing the motion is 6000 N. If the elevator is moving up with its full capacity, the power delivered by the motor to the elevator ($\mathrm { g } = 10 \mathrm {~m} / \mathrm { s } ^ { 2 }$) must be at least:\\
(1) 56300 W\\
(2) 62360 W\\
(3) 48000 W\\
(4) 66000 W