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Homework Help: Velocity Ratio and Efficiency

  1. Apr 21, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the velocity ratio of the system.

    Third Class Lever

    Efficiency = 65%
    Mechanical Advantage = 1/6
    Work Put In 3000J

    (I know if the system was theoretically 100% efficient the velocity ratio is 1/6 or 0.167)

    2. Relevant equations

    Velocity Ratio = Mechanical Advantage / Efficiency

    3. The attempt at a solution

    VR = MA / E

    VR = 0.167 / 0.65

    VR = 0.257

    This to me is a confusing answer as of the system was 100% efficient the ratio is only 0.167 and calculating it on 65% i'm getting a larger velocity ratio this can not be correct can it? Could someone please point me in the right direction?
  2. jcsd
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