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Finding work with given horsepower

  1. Oct 25, 2012 #1
    1. The problem statement, all variables and given/known data
    If one ferretpower (fp, made-up unit) is equal to 0.0312 hp, and an electric motor puts out 2.75 x 10^5 fp, how high (in meters) can it lift a crate that has a mass of 2.75 slugs in 5 s?


    2. Relevant equations
    P = W/t W = mgh
    1 hp = 745.7 watts
    1 slug = 14.59 kg


    3. The attempt at a solution
    Converted fp to hp to get 8,580 hp. Converted hp to watts to get 6,398,106 watts. Found weight of crate to be 40.1 kg. Used W = Pt to get 31,990,530 J. Used W/mg = h to get my final answer of 81,405 m. Is this the same answer you got?
     
    Last edited: Oct 25, 2012
  2. jcsd
  3. Oct 25, 2012 #2
    what is your question? Your process looks correct but do you really have a 8580 hp motor?
     
  4. Oct 25, 2012 #3
    My teacher's numbers tend to be quite stupid. Thanks for the reply.
     
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