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Homework Help: Conversions from hp to kWh

  1. Dec 11, 2009 #1
    1. The problem statement, all variables and given/known data

    A car needs 40 hp to move continuously at 60 mph. How long would 1 kg of hydrogen (talking about hydrogen fuel cells) move such a car, hence how many miles at 60 mph, if 1 kg of hydrogen provides 16 kWh of motive energy?

    2. Relevant equations

    1 hp = 746 W
    1 kW = 1000 W

    3. The attempt at a solution

    40 hp = 29.8 kW and we have 16 kWh of power
    I don't know where to factor in the 60 mph, though.
     
  2. jcsd
  3. Dec 11, 2009 #2
    The sixty mph is only needed to compute the distance traveled from using the fuel cell. You first need to compute how long it would last.
     
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