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OpenStudy (anonymous):
Describe the circumstances for which the output work would equal the input work in a machine.
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OpenStudy (anonymous):
machine must have an 100% efficiency rating
OpenStudy (dean.shyy):
It may be a friction-less machine. You would have to double check on that.
OpenStudy (anonymous):
i believe aidanbk has the best answer, but remember that only in completely ideal and hypothetical situations would a machine have a 100% efficiency, because some of the work put in will be lost to heat, and that is only one example as to how some energy would be lost
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