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Average Power Output

  1. Sep 28, 2013 #1
    1. The problem statement, all variables and given/known data

    620 seconds after starting its take-off, a 260000 kg jet reaches its cruising altitude of 9200 meters and flies with a speed of 235 m/s. Neglecting friction, what has been the average power output of the engines?

    2. Relevant equations

    ΔKE = Work
    Power = Work/time

    3. The attempt at a solution

    Initial KE = 0
    Final KE = .5*260000*235^2 = 7179250000
    Power = 7179250000/620 = 11579435.48 Watts

    Can someone see an issue with what I am trying to do here? I tried to type in this answer but apparently it is wrong.
     
  2. jcsd
  3. Sep 28, 2013 #2

    OmCheeto

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    I haven't checked your math, but I can see you left out the change in potential energy.
     
  4. Sep 28, 2013 #3
    Ok. Would that go into the work equation?
     
  5. Sep 29, 2013 #4

    OmCheeto

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    2016 Award

    I believe so.

    Try this: ΔKE + ΔPE = Work

    and see what happens.
     
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