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If a engine must do 500 joules of work to pull a 10 kg load up a height of 4 meters, what is the efficieency ?

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  1. The energy of raising the load is

    E = 10*9.8*4 = 392 joules.

    efficiency is 392/500 = 78%

    .


  2. The efficiency would be 100times greater than humans.

    500/10/4

    50/4

    12.5efficiency


  3. 80%  
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