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Horsepower problem

  1. Aug 27, 2016 #1
    1. The problem statement, all variables and given/known data
    Lifting a box (150 kg) up for 20 meters in 10 minutes, how much horsepower needed?

    2. Relevant equations
    1 Watts = 1 Joule/sec
    1 Horsepower = 746 Watts

    3. The attempt at a solution
    I've figured this out but I got a very low horsepower :( about 0.065 hp, does it correct?
     
  2. jcsd
  3. Aug 27, 2016 #2
    Sounds about right.
     
  4. Aug 28, 2016 #3
    Answers are not always intuitive.
    For instance, using the energy consumed by a 100 W bulb for an hour; to what height (using this energy)
    could you raise a 100 lb (about 40 kg) bundle of shingles? The answer might surprise you.
     
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