How Is Elevator Motor Efficiency Calculated?

[larry21]

An 8.5x10^2kg elevator is pulled up at a constant velocity of 1.00m/s by a 10.0kW electric motor. Calculate the efficiency of the motor.

Efficiency = work out/work in * 100

How do I calculate "work out/work in" using the information given?

 

[tiny-tim]

hi larry21!

(try using the X² icon just above the Reply box )

find the force, then find the power, then divide by 10.0 …

what do you get? ​

 

[larry21]

thanks, that was a great help. However, do I need to convert the "kW" to "W"

 

[tiny-tim]

oh yes … you'll need both to be in the same units