The crane, lifting the bricks to the 4th floor of the house under construction, performed work on them in 40 kJ
| March 3, 2021 | education
The crane, lifting the bricks to the 4th floor of the house under construction, performed work on them in 40 kJ, and the crane engine performed work equal to 100 kJ. What is the efficiency of the crane?
These tasks: Ap (work done on bricks, useful work) = 40 kJ; Az (work performed by the crane, work expended) = 100 kJ.
To calculate the efficiency of the crane used, we apply the formula: η = Ap / Az.
Calculation: η = 40/100 = 0.4 or 40%.
Answer: The efficiency of the used crane is 40%.
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