The lift mechanism has an efficiency of 90%. The elevator has completed 900 kJ of useful work.
| January 6, 2021 | education
The lift mechanism has an efficiency of 90%. The elevator has completed 900 kJ of useful work. What is the amount of work expended?
Initial data: η (lift mechanism efficiency) = 90% (0.9); Ap (useful work done by the elevator) = 900 kJ.
The amount of work expended by the lift mechanism can be calculated from the formula for calculating the efficiency: η = Ap / Az, whence Az = Ap / η.
Calculation: Az = 900 / 0.9 = 1000 kJ.
Answer: the work expended by the lift mechanism is 1000 kJ.
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