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Homework Help: Physics 11 help?

  1. Jan 11, 2009 #1
    Physics 11 help??!!

    1. The problem statement, all variables and given/known data

    a car jack applies a force of 3000N to lift one side of a car a distance of 10 cm. in order to accomplish this the person using the jack needed to apply a force of 1200N to the handle moving it 30 cm. what is the jack's efficiency?

    2. Relevant equations

    eff = (mgh/f*d) x 100%

    3. The attempt at a solution

    idk where 2 start??
  2. jcsd
  3. Jan 11, 2009 #2


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    Homework Helper

    Re: Physics 11 help??!!

    Write the formula. Replace each letter with the appropriate number.
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