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2 September, 06:35

Several students in the group made comments to the Coach about the back pack. Which student has the correct analysis of the forces and motion of the back pack?

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  1. 2 September, 08:32
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    20%

    Explanation:

    Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

    η = (q₁-q₂) / q₁*100%

    η is efficiency, q₁ is the energy intake, q₂ is energy wasted.

    the information provided is:

    energy intake = 400 j

    work done = 80 j = (400-320) = q₁-q₂

    energy wasted = 320 j

    η = 80/400*100%

    =20%
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