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Alina [70]
2 years ago
7

Bill does 1500 J of work on a lever, which is a simple machine. The lever does 1350 J of work on a stone.

Biology
2 answers:
MaRussiya [10]2 years ago
7 0

The correct answer is:

C. 90%

The efficiency of the lever is 90%.

|Huntrw6|

Oksanka [162]2 years ago
3 0
Efficiency is the measure of how much work or energy is conserved in a process. In many processes, work or energy is lost, for example as waste heat or vibration. The efficiency is the energy output, divided by the energy input, and expressed as a percentage.
Efficiency is the energy output, divided by the energy input, and expressed as a percentage. 
Efficiency = (1350/1500)×100
                = 90%
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