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Homework Help: Average Power Problem

  1. Dec 12, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1500kg car can go from zero to 90km/h in 5.0 seconds. What is the average power required to do this?


    2. Relevant equations

    I tried with P=Fv, I don't really know what else to use(

    3. The attempt at a solution
    First I converted the 90km/h to m/s and got 25m/s/
    Then I did F=mg with m=1500 and g=9.81m/s^2
    Then I used the equation P=Fv
    P=Fv
    P=14175 x 25m/s
    P=354375W

    ANSWER: 93750w OR 125.7 hp.

    Any help would be greatly appreciated.
    Thanks
     
  2. jcsd
  3. Dec 12, 2008 #2

    rl.bhat

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    Homework Helper

     
  4. Dec 12, 2008 #3
     
  5. Dec 12, 2008 #4

    rl.bhat

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    Homework Helper

    Now average power =ForceX average velocity
     
  6. Dec 12, 2008 #5
    Excellent. Thank you very much!
     
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