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21. In a practical machine, the power output is _______ the power input.?

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A. smaller than

B. larger than

C. equal to

D. multiplied by

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  1. A


  2. smaller then (A)

    as there is no known way to make something over 100% efficient  

  3. A. Smaller Than

    If there was no friction it could possibly be equal, it could never be larger, and multiplied by just makes no sense.  
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