Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook