anonymous
  • anonymous
A 25000 Kg airplane takes off from rest and reaches 5000m altitude and cruises at 900km/h in 8 minutes .Find Avg Power ?
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
My Work: Pavg = W/t W = Delta K.E W = 25000 * 250*250 / 2 t = 8 * 60
anonymous
  • anonymous
i got Pavg = 1.6 MW but the answer shuld be 4.2 MW
terenzreignz
  • terenzreignz
Hang on a bit...

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Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
You have forgotten the gain in gravitational potential energy.
anonymous
  • anonymous
We have Consider P.E here ?
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
Of course! How could you raise the altitude of the plane without providing energy?!
anonymous
  • anonymous
Yup...i got..it...thx..)
anonymous
  • anonymous
but @Vincent-Lyon.Fr we knw change in K.E is Work Done..Why cant we Use it here..)
anonymous
  • anonymous
Is it then mgh+delta K.E /t ?
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
You can, but there are two works to take into account: - motive work by the engine (positive) - negative work by the weight so change in KE = Wengine - Mgh or W engine = change in KE + change in PE
anonymous
  • anonymous
Ok...Thxx....
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
yw :)
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
I see you are now getting to the energy concept. Soon you will be able to solve problems of mechanics by this method.

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