You do 32 joules of work using a pair of scissors. The scissors do 25 joules of work cutting a piece of fabric. What is the efficiency of the scissors?

Efficiency = 65%

Explanation:

The formula of Efficiency applied to any circumstance is:

Efficiency = Useful Energy / Energy applied

Then replacing the values given its:

Efficiency = 25 J / 32 J

Efficiency = 0.65

0.65 written as percentage is 65%, then:

Efficiency = 65%

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