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Homework Help: Figuring out the efficiency of an inclined plane

  1. Jun 15, 2007 #1
    1. The problem statement, all variables and given/known data
    Rather than lifting a 225kg motorcycle 60cm on a truck, Samantha uses a 4m plank as an incline and only requires 345N to push up the ramp

    2. Relevant equations

    3. The attempt at a solution

    To find work output, i did .6M X 2250N giving me 1350 J
    To find work input, i did 345N X 4M giving me 1380J
    I divided 1350J by 1380J giving me 97.8 % efficiency
    For mechanical advantage i said 6.5, by dividing 2250N by 345N

    Can somone correct this, or tell me if I got this right, thank you!!
  2. jcsd
  3. Jun 16, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks OK to me. (You are using a value of g = 10 m/s^2.)
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